CN112125767A - Honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material and preparation process thereof - Google Patents
Honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material and preparation process thereof Download PDFInfo
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- CN112125767A CN112125767A CN202011024755.7A CN202011024755A CN112125767A CN 112125767 A CN112125767 A CN 112125767A CN 202011024755 A CN202011024755 A CN 202011024755A CN 112125767 A CN112125767 A CN 112125767A
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B45/00—Compositions or products which are defined by structure or arrangement of component of product
- C06B45/04—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive
- C06B45/06—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive the solid solution or matrix containing an organic component
- C06B45/10—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive the solid solution or matrix containing an organic component the organic component containing a resin
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
- C06B21/0033—Shaping the mixture
- C06B21/0041—Shaping the mixture by compression
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B27/00—Compositions containing a metal, boron, silicon, selenium or tellurium or mixtures, intercompounds or hydrides thereof, and hydrocarbons or halogenated hydrocarbons
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Abstract
The invention provides a honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material and a preparation process thereof, relating to the field of energetic materials. A honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material comprises the following raw materials: the aluminum powder and the polytetrafluoroethylene powder are mixed and filled in the cells; the honeycomb aluminum material is used as a framework to reinforce the dynamic compressive strength of the aluminum/polytetrafluoroethylene active material, and the dynamic compressive strength is good in improvement effect. In addition, the invention also provides a preparation process of the honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material, which comprises the following steps: preparing mixed medicinal powder, cutting a framework, filling and prepressing, performing primary pressing, performing secondary pressing and sintering a medicinal column; the whole process flow is simple, the production cost is favorably reduced, the dynamic compression strength of the material is good in improvement effect, and the production is easy.
Description
Technical Field
The invention relates to the technical field of energetic materials, in particular to a honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material and a preparation process thereof.
Background
The aluminum/polytetrafluoroethylene active material is a solid energetic material capable of releasing a large amount of chemical energy under the action of strong impact load, has certain mechanical strength compared with the traditional explosive energetic material, can be used as a structural material to replace the traditional inert metal material in an ammunition battle part, and is a typical representative of the energetic material. However, the compressive strength of the conventional aluminum/polytetrafluoroethylene active material is only tens of megapascals, which has severely restricted the wide application of the material in various ammunition battle portions. Therefore, it is necessary to provide effective and feasible dynamic compressive strength improvement means and improve the conventional preparation process.
The existing process mainly depends on component regulation and control to improve the aluminum/polytetrafluoroethylene active material, the improvement effect is generally poor, the dynamic compression strength improvement effect of the material is limited, and the practicability is low.
Disclosure of Invention
The invention aims to provide a honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material which is good in dynamic compression strength improvement effect and high in practicability.
The invention also aims to provide a preparation process of the honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material, which has the advantages of simple process flow, contribution to reducing the production cost, good effect of improving the dynamic compression strength of the material and easiness in production.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
In one aspect, an embodiment of the present invention provides a honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material, which includes the following raw materials: the aluminum powder and the polytetrafluoroethylene powder are mixed and filled in the cells.
On the other hand, the preparation process of the honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material provided by the embodiment of the invention comprises the following steps:
preparing mixed medicinal powder: putting the aluminum powder and the polytetrafluoroethylene powder into a mixer to be uniformly mixed to prepare mixed powder;
cutting a framework: cutting the honeycomb aluminum material, removing redundant parts, and then putting the cut honeycomb aluminum material into a die;
filling and prepressing: filling the mixed medicinal powder into the cell holes of the honeycomb aluminum material, repeatedly filling the mixed medicinal powder, repeatedly pre-pressing the mixed medicinal powder by a flat-head thimble array punch, and filling the mixed medicinal powder to a position 1-2mm below the top end of the honeycomb aluminum material after repeated pre-pressing;
first-stage pressing: putting the mould after the filling and prepressing into a press machine, pressurizing and pressing by a flat-head thimble array punch to obtain a prepared grain, taking the prepared grain out of the mould, cutting off redundant parts to enable the top surface of the prepared grain to be flat, and enabling the top surface of the prepared grain to be parallel to the bottom surface of the prepared grain to obtain a primary grain;
secondary pressing: putting the primary explosive columns into a die, putting the die into a press machine, and pressurizing and pressing by a planar punch to obtain secondary explosive columns;
sintering the grain: and taking the secondary explosive column out of the mold, putting the secondary explosive column into a muffle furnace, introducing protective gas into the muffle furnace, heating the muffle furnace in a protective gas environment, firing the muffle furnace, and cooling the muffle furnace to obtain a finished product.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
aiming at the first aspect, the embodiment of the invention provides a honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material, which comprises the following raw materials: the aluminum powder and the polytetrafluoroethylene powder are mixed and filled in the cells.
The honeycomb aluminum framework enhanced aluminum/polytetrafluoroethylene active material is improved by taking a honeycomb aluminum material as a framework, the aluminum/polytetrafluoroethylene active material is structurally supported, the dynamic compressive strength of the aluminum/polytetrafluoroethylene active material can be improved on the basis of not influencing the activity of a metal/fluoropolymer material, the dynamic compressive strength of the aluminum/polytetrafluoroethylene active material taking the honeycomb aluminum material as the framework is obviously higher than that of the traditional aluminum/polytetrafluoroethylene active material through experimental detection, and the practicability of the product is high.
Aiming at the second aspect, the embodiment of the invention provides a preparation process of a honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material, which comprises the following steps: preparing mixed medicinal powder, cutting a framework, filling and prepressing, performing primary pressing, performing secondary pressing and sintering a medicinal column.
According to the preparation process of the honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material, the raw materials are fully and uniformly mixed through the preparation step of the mixed powder, so that the uniform texture of the product is ensured, and the performance of the product is ensured; the honeycomb aluminum material is cut through the skeleton cutting step, so that the honeycomb aluminum material meets the production and use requirements, and the honeycomb aluminum material can be fully pressed with aluminum powder and polytetrafluoroethylene powder, so that the use performance of the product is guaranteed; aluminum powder and polytetrafluoroethylene powder are filled in the honeycomb aluminum material through the medicine filling and prepressing step to prepare the medicine column, the raw materials are combined more tightly through repeated prepressing, meanwhile, the performance of the raw materials can be prevented from being damaged, and the using effect of the product is guaranteed; the pre-pressed and formed grain is further pressed through the first-stage pressing step and the second-stage pressing step, the pressing process is divided into two stages, so that the honeycomb aluminum material can be prevented from being damaged in the pressing process, and the raw materials can be pressed and combined more tightly, so that the dynamic compression strength of the product is improved, and the practical value is improved; and finally, sintering is carried out through the grain sintering step, and the raw materials are further combined through high temperature, so that the material performance is improved, and the practical value of the product is enhanced. The whole process flow is simple, the production cost is favorably reduced, the production is easy, and the produced product passes through experimental detection, so that the dynamic compression strength is high, and the practical value is high.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a graph of data from dynamic compression experiments for aluminum/polytetrafluoroethylene active materials prepared by conventional processes;
fig. 2 is a data diagram of a dynamic compression experiment of a honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene material according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to specific examples.
A honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material comprises the following raw materials: the aluminum powder and the polytetrafluoroethylene powder are mixed and filled in the cells.
In the above embodiment, the aluminum powder and the polytetrafluoroethylene powder are mixed and filled in the cells of the honeycomb aluminum material, the honeycomb aluminum material is used as a framework to improve the aluminum/polytetrafluoroethylene active material, the aluminum/polytetrafluoroethylene active material is structurally supported, the dynamic compressive strength of the aluminum/polytetrafluoroethylene active material can be improved on the basis of not influencing the activity of the metal/fluoropolymer material, and through experimental detection, the dynamic compressive strength of the aluminum/polytetrafluoroethylene active material using the honeycomb aluminum material as the framework is obviously higher than that of the traditional aluminum/polytetrafluoroethylene active material, and the practicability of the product is high.
In some embodiments of the present invention, the aluminum powder has a particle size of 5 to 10 μm, and the polytetrafluoroethylene powder has a particle size of 30 to 35 μm.
In the embodiment, the aluminum powder with the particle size of 5-10 microns and the polytetrafluoroethylene powder with the particle size of 30-35 microns are adopted, so that the raw materials can be combined more tightly in the subsequent pressing process, and the phenomenon that gaps are generated in the materials due to overlarge or undersize particle sizes is avoided, so that the service performance of the honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material is ensured, and the use effect is enhanced.
In some embodiments of the present invention, the aluminum powder is 8 to 15 parts by weight, and the polytetrafluoroethylene powder is 25 to 30 parts by weight.
In the embodiment, the use performance of the product can be ensured by adopting the weight ratio, the influence on material characteristics due to improper raw material ratio is avoided, and the practical value of the product is favorably improved.
A preparation process of a honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material is characterized by comprising the following steps:
preparing mixed medicinal powder: putting the aluminum powder and the polytetrafluoroethylene powder into a mixer to be uniformly mixed to prepare mixed powder;
cutting a framework: cutting the honeycomb aluminum material, removing redundant parts, and then putting the cut honeycomb aluminum material into a die;
filling and prepressing: filling the mixed medicinal powder into the cell holes of the honeycomb aluminum material, repeatedly filling the mixed medicinal powder, repeatedly pre-pressing the mixed medicinal powder by a flat-head thimble array punch, and filling the mixed medicinal powder to a position 1-2mm below the top end of the honeycomb aluminum material after repeated pre-pressing;
first-stage pressing: putting the mould after the filling and prepressing into a press machine, pressurizing and pressing by a flat-head thimble array punch to obtain a prepared grain, taking the prepared grain out of the mould, cutting off redundant parts to enable the top surface of the prepared grain to be flat, and enabling the top surface of the prepared grain to be parallel to the bottom surface of the prepared grain to obtain a primary grain;
secondary pressing: putting the primary explosive columns into a die, putting the die into a press machine, and pressurizing and pressing by a planar punch to obtain secondary explosive columns;
sintering the grain: and taking the secondary explosive column out of the mold, putting the secondary explosive column into a muffle furnace, introducing protective gas into the muffle furnace, heating the muffle furnace in a protective gas environment, firing the muffle furnace, and cooling the muffle furnace to obtain a finished product.
In the embodiment, the raw materials are fully and uniformly mixed through the preparation step of the mixed medicinal powder, so that the uniform texture of the product is ensured, and the performance of the product is ensured; the honeycomb aluminum material is cut through the skeleton cutting step, so that the honeycomb aluminum material meets the production and use requirements, and the honeycomb aluminum material can be fully pressed with aluminum powder and polytetrafluoroethylene powder, so that the use performance of the product is guaranteed; aluminum powder and polytetrafluoroethylene powder are filled in the honeycomb aluminum material through the medicine filling and prepressing step to prepare the medicine column, the raw materials are combined more tightly through repeated prepressing, meanwhile, the performance of the raw materials can be prevented from being damaged, and the using effect of the product is guaranteed; the pre-pressed and formed grain is further pressed through the first-stage pressing step and the second-stage pressing step, the pressing process is divided into two stages, so that the honeycomb aluminum material can be prevented from being damaged in the pressing process, and meanwhile, the raw materials can be pressed and combined more tightly, so that the dynamic compression strength of the product is improved, and the practical value is improved; and finally, sintering is carried out through the grain sintering step, and the raw materials are further combined through high temperature, so that the material performance is improved, and the practical value of the product is enhanced. The whole process flow is simple, the production cost is favorably reduced, the production is easy, and the produced product passes through experimental detection, so that the dynamic compression strength is high, and the practical value is high.
In some embodiments of the present invention, in the step of pre-pressing for filling the explosive, the flat-headed needle array punch performs the pre-pressing repeatedly at a pressure of 1 to 2 MPa.
In the above embodiment, the flat-head thimble array punch is repeatedly pre-pressed at a pressure of 1-2MPa, so that the mixed powder is tightly and fully filled in the honeycomb aluminum material, and the characteristics of the raw material can be protected from being damaged by adopting a smaller pressure, thereby ensuring the service performance of the product and improving the practical value.
In some embodiments of the present invention, in the first-stage pressing step, the mold is placed into a press, pressurized to 200-220MPa at a pressure increasing rate of 35-45MPa/min, and kept for 5-10min for pressing, so as to obtain the first-stage grain.
In the embodiment, the pressure is increased to 200-220MPa at the pressure increasing rate of 35-45MPa/min, and the pressure is maintained for 5-10min to perform primary pressing, so that the pressure increasing rate is controlled, the pressing and combination of the materials are tighter on the basis of protecting the characteristics of the raw materials from being damaged, the service performance of the product is improved, and the use effect of the product is enhanced.
In some embodiments of the present invention, in the secondary pressing, the primary grain is placed in a mold, the mold is placed in a press, the pressure is increased to 200-220MPa at a pressure increasing rate of 40-45MPa/min, the pressure is maintained for 5-10min, and the secondary grain is obtained.
In the embodiment, the pressure is increased to 200-220MPa at the pressure increasing rate of 40-45MPa/min, the pressure is maintained for 5-10min for secondary pressing, the pressure increasing rate is controlled, further pressing is carried out on the basis of primary pressing, materials are tightly and fully combined together, the use performance of the product is further improved, and the use effect of the product is enhanced.
In some embodiments of the invention, in the step of sintering the grain, protective gas is introduced into the muffle furnace, the flow rate of the protective gas is 20-25L/min, the temperature is raised to 300-350 ℃ at a temperature rise rate of 1-1.5 ℃/min under the protective gas environment, then the temperature is raised to 350-400 ℃ at a temperature rise rate of 0.5-1 ℃/min, the temperature is kept for 30-60min, then the temperature is lowered to 350-300 ℃ at a temperature decrease rate of 0.5-1 ℃/min, the temperature is kept for 30-60min, then the temperature is lowered to 100-90 ℃ at a temperature decrease rate of 1-2 ℃/min, and finally the grain is naturally cooled to room temperature in the muffle furnace, so as to obtain the finished product.
In the embodiment, the protective gas environment can protect the material from being polluted by impurities in the sintering process, and the protective gas can also play a role in heat conduction, so that the performance of the product is improved; the sintering temperature is controlled in multiple stages by controlling the temperature increasing rate, so that the damage to the material characteristics due to overhigh temperature can be avoided, and the material performance is improved; meanwhile, the materials can be sintered more fully through multi-stage heating, so that the product performance can be further improved, and the practical value of the product is enhanced.
In some embodiments of the present invention, the protective gas is nitrogen.
In the embodiment, the nitrogen gas can be used for better protecting, and meanwhile, the nitrogen gas can also have the heat conducting effect, and the nitrogen gas heat conduction device is convenient to use.
In some embodiments of the present invention, the press described above is a YLJ-50 press.
In the embodiment, the YLJ-50 press can be used for better controlling the pressing pressure, so that the smooth pressing is facilitated, and the production is easy.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material provided by the embodiment is prepared by the following steps:
preparing mixed medicinal powder: putting 8g of aluminum powder with the particle size of 5 mu m and 25g of polytetrafluoroethylene powder with the particle size of 30 mu m into a mixer to be uniformly mixed to prepare mixed powder;
cutting a framework: cutting the honeycomb aluminum material, removing redundant parts, and then putting the cut honeycomb aluminum material into a die, wherein the length of the cut honeycomb aluminum skeleton is 1.5mm, and the thickness of the cut honeycomb aluminum skeleton is 38 mu m;
filling and prepressing: filling the mixed medicinal powder into the cell holes of the honeycomb aluminum material, repeatedly filling and repeatedly pre-pressing the mixed medicinal powder by a flat-head thimble array punch head at the pressure of 1MPa to fill the mixed medicinal powder to a position 1mm below the top end of the honeycomb aluminum material;
first-stage pressing: putting the mould after the medicine filling and prepressing into a YLJ-50 press, pressurizing to 200MPa at a boosting rate of 35MPa/min by a flat-head thimble array punch, maintaining the pressure for 5min, and pressing to obtain a prepared medicine column, taking the prepared medicine column out of the mould, cutting off redundant parts, flattening the top surface of the prepared medicine column, and enabling the top surface of the prepared medicine column to be parallel to the bottom surface of the prepared medicine column, thereby obtaining a primary medicine column;
secondary pressing: putting the primary explosive column into a die, putting the die into a YLJ-50 press, pressurizing to 200MPa at a boosting rate of 40MPa/min by a planar punch, maintaining the pressure for 5min, and pressing to obtain a secondary explosive column after pressing;
sintering the grain: taking the secondary grain out of the mold, putting the secondary grain into a muffle furnace, introducing nitrogen into the muffle furnace, wherein the flow rate of the nitrogen is 20L/min, heating to 300 ℃ at the temperature rise rate of 1 ℃/min under the nitrogen environment, heating to 350 ℃ at the temperature rise rate of 0.5 ℃/min, preserving heat for 30min, cooling to 300 ℃ at the temperature reduction rate of 0.5 ℃/min, preserving heat for 30min, cooling to 100 ℃ at the temperature reduction rate of 1 ℃/min, naturally cooling to room temperature in the muffle furnace, and cooling to obtain a finished product;
example 2
The honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material provided by the embodiment is prepared by the following steps:
preparing mixed medicinal powder: taking 15g of aluminum powder with the particle size of 10 microns and 30g of polytetrafluoroethylene powder with the particle size of 35 microns, and uniformly mixing in a mixer to prepare mixed powder;
cutting a framework: cutting the honeycomb aluminum material, removing redundant parts, and then putting the cut honeycomb aluminum material into a die, wherein the length of the cut honeycomb aluminum skeleton is 1.5mm, and the thickness of the cut honeycomb aluminum skeleton is 38 mu m;
filling and prepressing: filling the mixed medicinal powder into the cell holes of the honeycomb aluminum material, repeatedly filling and repeatedly pre-pressing by a flat-head thimble array punch head at the pressure of 2MPa, so that the mixed medicinal powder is filled to the position 2mm below the top end of the honeycomb aluminum material;
first-stage pressing: putting the mould subjected to the medicine filling and prepressing into a YLJ-50 press, pressurizing to 220MPa at a boosting rate of 45MPa/min through a flat-head thimble array punch, maintaining the pressure for 10min, and pressing to obtain a prepared medicine column, taking the prepared medicine column out of the mould, cutting off redundant parts, flattening the top surface of the prepared medicine column, and enabling the top surface of the prepared medicine column to be parallel to the bottom surface of the prepared medicine column, thereby obtaining a primary medicine column;
secondary pressing: putting the primary explosive column into a die, putting the die into a YLJ-50 press, pressurizing to 220MPa at a boosting rate of 45MPa/min by a planar punch, maintaining the pressure for 10min, and pressing to obtain a secondary explosive column after pressing;
sintering the grain: taking the secondary grain out of the mold, putting the secondary grain into a muffle furnace, introducing nitrogen into the muffle furnace, wherein the nitrogen flow is 25L/min, heating to 350 ℃ at the temperature rise rate of 1.5 ℃/min in the nitrogen environment, heating to 400 ℃ at the temperature rise rate of 1 ℃/min, preserving heat for 60min, cooling to 300 ℃ at the temperature reduction rate of 1 ℃/min, preserving heat for 60min, cooling to 90 ℃ at the temperature reduction rate of 2 ℃/min, naturally cooling to room temperature in the muffle furnace, and cooling to obtain a finished product;
example 3
The honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material provided by the embodiment is prepared by the following steps:
preparing mixed medicinal powder: putting 12g of aluminum powder with the particle size of 8 mu m and 27g of polytetrafluoroethylene powder with the particle size of 32 mu m into a mixer to be uniformly mixed to prepare mixed powder;
cutting a framework: cutting the honeycomb aluminum material, removing redundant parts, and then putting the cut honeycomb aluminum material into a die, wherein the length of the cut honeycomb aluminum skeleton is 1.5mm, and the thickness of the cut honeycomb aluminum skeleton is 38 mu m;
filling and prepressing: filling the mixed medicinal powder into the cell holes of the honeycomb aluminum material, repeatedly filling and repeatedly pre-pressing the mixed medicinal powder by a flat-head thimble array punch head at the pressure of 1.5MPa so that the mixed medicinal powder is filled to a position 1.5mm below the top end of the honeycomb aluminum material;
first-stage pressing: putting the mould subjected to the medicine filling and prepressing into a YLJ-50 press, pressurizing to 210MPa at a boosting rate of 40MPa/min through a flat-head thimble array punch, maintaining the pressure for 7min, and pressing to obtain a prepared medicine column, taking the prepared medicine column out of the mould, cutting off redundant parts, flattening the top surface of the prepared medicine column, and enabling the top surface of the prepared medicine column to be parallel to the bottom surface of the prepared medicine column, thereby obtaining a primary medicine column;
secondary pressing: putting the primary explosive column into a die, putting the die into a YLJ-50 press, pressurizing to 210MPa at a boosting rate of 42MPa/min by a planar punch, maintaining the pressure for 7min, and pressing to obtain a secondary explosive column after pressing;
sintering the grain: taking the secondary grain out of the mold, putting the secondary grain into a muffle furnace, introducing nitrogen into the muffle furnace, wherein the nitrogen flow is 23L/min, heating to 325 ℃ at the temperature rise rate of 1 ℃/min under the nitrogen environment, heating to 375 ℃ at the temperature rise rate of 1 ℃/min, preserving heat for 45min, cooling to 325 ℃ at the temperature reduction rate of 1 ℃/min, preserving heat for 45min, cooling to 95 ℃ at the temperature reduction rate of 1 ℃/min, naturally cooling to room temperature in the muffle furnace, and cooling to obtain a finished product;
example 4
The honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material provided by the embodiment is prepared by the following steps:
preparing mixed medicinal powder: taking 10g of aluminum powder with the particle size of 7 mu m and 25g of polytetrafluoroethylene powder with the particle size of 32 mu m, and uniformly mixing the aluminum powder and the polytetrafluoroethylene powder in a mixer to prepare mixed powder;
cutting a framework: cutting the honeycomb aluminum material, removing redundant parts, and then putting the cut honeycomb aluminum material into a die, wherein the length of the cut honeycomb aluminum skeleton is 1.5mm, and the thickness of the cut honeycomb aluminum skeleton is 38 mu m;
filling and prepressing: filling the mixed medicinal powder into the cell holes of the honeycomb aluminum material, repeatedly filling and repeatedly pre-pressing the mixed medicinal powder by a flat-head thimble array punch head at the pressure of 1MPa to fill the mixed medicinal powder to a position 1mm below the top end of the honeycomb aluminum material;
first-stage pressing: putting the mould after the medicine filling and prepressing into a YLJ-50 press, pressurizing to 200MPa at a boosting rate of 35-45MPa/min by a flat-head thimble array punch, keeping the pressure for 6min, pressing to obtain a prepared medicine column, taking the prepared medicine column out of the mould, cutting off redundant parts, flattening the top surface of the prepared medicine column, and enabling the top surface of the prepared medicine column to be parallel to the bottom surface of the prepared medicine column, thereby obtaining a primary medicine column;
secondary pressing: putting the primary explosive column into a die, putting the die into a YLJ-50 press, pressurizing to 200MPa at a boosting rate of 42MPa/min by a planar punch, maintaining the pressure for 6min, and pressing to obtain a secondary explosive column after pressing;
sintering the grain: taking the secondary grain out of the mold, putting the secondary grain into a muffle furnace, introducing nitrogen into the muffle furnace, wherein the nitrogen flow is 22L/min, heating to 320 ℃ at the temperature rise rate of 1.2 ℃/min in the nitrogen environment, heating to 360 ℃ at the temperature rise rate of 1 ℃/min, preserving heat for 40min, cooling to 320 ℃ at the temperature reduction rate of 0.5-1 ℃/min, preserving heat for 40min, cooling to 95 ℃ at the temperature reduction rate of 1 ℃/min, and naturally cooling to room temperature in the muffle furnace to obtain a finished product after cooling;
example 5
The honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material provided by the embodiment is prepared by the following steps:
preparing mixed medicinal powder: taking 14g of aluminum powder with the particle size of 8 microns and 30g of polytetrafluoroethylene powder with the particle size of 35 microns, and uniformly mixing in a mixer to prepare mixed powder;
cutting a framework: cutting the honeycomb aluminum material, removing redundant parts, and then putting the cut honeycomb aluminum material into a die, wherein the length of the cut honeycomb aluminum skeleton is 1.5mm, and the thickness of the cut honeycomb aluminum skeleton is 38 mu m;
filling and prepressing: filling the mixed medicinal powder into the cell holes of the honeycomb aluminum material, repeatedly filling and repeatedly pre-pressing by a flat-head thimble array punch head at the pressure of 2MPa, so that the mixed medicinal powder is filled to the position 2mm below the top end of the honeycomb aluminum material;
first-stage pressing: putting the mould after the medicine filling and prepressing into a YLJ-50 press, pressurizing to 210MPa at a boosting rate of 45MPa/min through a flat-head thimble array punch, maintaining the pressure for 10min, and pressing to obtain a prepared medicine column, taking the prepared medicine column out of the mould, cutting off redundant parts, flattening the top surface of the prepared medicine column, and enabling the top surface of the prepared medicine column to be parallel to the bottom surface of the prepared medicine column, thereby obtaining a primary medicine column;
secondary pressing: putting the primary explosive column into a die, putting the die into a YLJ-50 press, pressurizing to 220MPa at a boosting rate of 45MPa/min by a planar punch, maintaining the pressure for 10min, and pressing to obtain a secondary explosive column after pressing;
sintering the grain: taking the secondary grain out of the mold, putting the secondary grain into a muffle furnace, introducing nitrogen into the muffle furnace, wherein the nitrogen flow is 24L/min, heating to 340 ℃ at a temperature rise rate of 1.5 ℃/min in a nitrogen environment, heating to 380 ℃ at the temperature rise rate of 1 ℃/min, preserving heat for 50min, cooling to 340 ℃ at a temperature reduction rate of 1 ℃/min, preserving heat for 50min, cooling to 95 ℃ at the temperature reduction rate of 1 ℃/min, naturally cooling to room temperature in the muffle furnace, and cooling to obtain a finished product;
example 6
The honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material provided by the embodiment is prepared by the following steps:
preparing mixed medicinal powder: putting 9g of aluminum powder with the particle size of 5 microns and 25g of polytetrafluoroethylene powder with the particle size of 34 microns into a mixer, and uniformly mixing to obtain mixed powder;
cutting a framework: cutting the honeycomb aluminum material, removing redundant parts, and then putting the cut honeycomb aluminum material into a die, wherein the length of the cut honeycomb aluminum skeleton is 1.5mm, and the thickness of the cut honeycomb aluminum skeleton is 38 mu m;
filling and prepressing: filling the mixed medicinal powder into the cell holes of the honeycomb aluminum material, repeatedly filling and repeatedly pre-pressing the mixed medicinal powder by a flat-head thimble array punch head at the pressure of 1MPa to fill the mixed medicinal powder to a position 1mm below the top end of the honeycomb aluminum material;
first-stage pressing: putting the mould after the medicine filling and prepressing into a YLJ-50 press, pressurizing to 200MPa at a boosting rate of 40MPa/min by a flat-head thimble array punch, maintaining the pressure for 5min, and pressing to obtain a prepared medicine column, taking the prepared medicine column out of the mould, cutting off redundant parts, flattening the top surface of the prepared medicine column, and enabling the top surface of the prepared medicine column to be parallel to the bottom surface of the prepared medicine column, thereby obtaining a primary medicine column;
secondary pressing: putting the primary explosive column into a die, putting the die into a YLJ-50 press, pressurizing to 200MPa at a boosting rate of 40MPa/min by a planar punch, maintaining the pressure for 5min, and pressing to obtain a secondary explosive column after pressing;
sintering the grain: taking the secondary grain out of the mold, putting the secondary grain into a muffle furnace, introducing nitrogen into the muffle furnace, wherein the nitrogen flow is 20L/min, heating to 325 ℃ at a temperature rise rate of 1.3 ℃/min in a nitrogen environment, heating to 375 ℃ at a temperature rise rate of 0.7 ℃/min, preserving heat for 40min, cooling to 325 ℃ at a temperature reduction rate of 0.6 ℃/min, preserving heat for 30min, cooling to 100 ℃ at a temperature reduction rate of 1.9 ℃/min, naturally cooling to room temperature in the muffle furnace, and cooling to obtain a finished product;
test examples
The aluminum/polytetrafluoroethylene active material prepared by the traditional process is subjected to a dynamic compression experiment by a Hopkinson experiment system, the Hopkinson pressure bar is made of solid solution reinforced aluminum, the loading speed is 14.8m/s, and the measured data is shown in figure 1;
in the honeycomb aluminum framework enhanced aluminum/polytetrafluoroethylene active material provided by embodiment 6 of the invention, the material of the Hopkinson pressure bar is solid solution strengthened aluminum, the loading speed is 24.3m/s, and the measured data is shown in FIG. 2;
as can be seen from fig. 1, the dynamic compressive strength of the aluminum/polytetrafluoroethylene active material prepared by the conventional process is 25.17MPa, and the maximum strain is 0.0022;
as can be seen from fig. 2, the honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material provided in example 6 of the present invention has a dynamic compressive strength of 78.77MPa and a maximum strain of 0.1239;
as can be seen from comparison between fig. 1 and fig. 2, the dynamic compressive strength of the honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material provided by the invention is far higher than that of an aluminum/polytetrafluoroethylene active material prepared by a conventional process, the reinforcing method is simple, no inert component is added, the maximum reaction thermal ratio of aluminum and polytetrafluoroethylene can be ensured, and the practical value of the product is high.
In summary, the embodiments of the present invention provide a metal fluoro/polymer active material, which uses a honeycomb aluminum material as a framework to improve an aluminum/polytetrafluoroethylene active material, and structurally supports the aluminum/polytetrafluoroethylene active material, so as to improve the dynamic compressive strength of the aluminum/polytetrafluoroethylene active material without affecting the activity of the metal/fluoropolymer active material, and through experimental detection, the dynamic compressive strength of the aluminum/polytetrafluoroethylene active material using the honeycomb aluminum material as the framework is significantly higher than that of the conventional aluminum/polytetrafluoroethylene active material;
the embodiment of the invention also provides a preparation process of the honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material, the preparation process fully and uniformly mixes the raw materials through the preparation step of the mixed powder, and ensures the uniform texture of the product, thereby ensuring the performance of the product; the honeycomb aluminum material is cut through the skeleton cutting step, so that the honeycomb aluminum material meets the production and use requirements, and the honeycomb aluminum material can be fully pressed with aluminum powder and polytetrafluoroethylene powder, so that the use performance of the product is guaranteed; aluminum powder and polytetrafluoroethylene powder are filled in the honeycomb aluminum material through the medicine filling and prepressing step to prepare the medicine column, the raw materials are combined more tightly through repeated prepressing, meanwhile, the performance of the raw materials can be prevented from being damaged, and the using effect of the product is guaranteed; the pre-pressed and formed grain is further pressed through the first-stage pressing step and the second-stage pressing step, the pressing process is divided into two stages, so that the honeycomb aluminum material can be prevented from being damaged in the pressing process, and meanwhile, the raw materials can be pressed and combined more tightly, so that the dynamic compression strength of the product is improved, and the practical value is improved; and finally, sintering is carried out through the grain sintering step, and the raw materials are further combined through high temperature, so that the material performance is improved, and the practical value of the product is enhanced. The whole process flow is simple, the production cost is favorably reduced, the production is easy, and the produced product passes through experimental detection, so that the dynamic compression strength is high, and the practical value is high.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (10)
1. A honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material is characterized by comprising the following raw materials: the aluminum powder, the polytetrafluoroethylene powder and the honeycomb aluminum material are filled in the cells in a mixed mode.
2. The honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material as recited in claim 1, wherein the aluminum powder has a particle size of 5-10 μm, and the polytetrafluoroethylene powder has a particle size of 30-35 μm.
3. The honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material as recited in claim 2, wherein the aluminum powder is 8-15 parts by weight, and the polytetrafluoroethylene powder is 25-30 parts by weight.
4. A method for preparing the honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material as claimed in any one of claims 1 to 3, characterized by comprising the following steps:
preparing mixed medicinal powder: putting the aluminum powder and the polytetrafluoroethylene powder into a mixer to be uniformly mixed to prepare mixed powder;
cutting a framework: cutting the aluminum honeycomb material, removing redundant parts, and then putting the cut aluminum honeycomb material into a mold;
filling and prepressing: filling the mixed powder into the cell holes of the honeycomb aluminum material, repeatedly filling the mixed powder, repeatedly pre-pressing the mixed powder by a flat-head thimble array punch, and filling the mixed powder to a position 1-2mm below the top end of the honeycomb aluminum material after repeated pre-pressing;
first-stage pressing: putting the mould subjected to the medicine filling and prepressing into a press machine, performing pressurization and pressing through a flat-head thimble array punch to obtain a prepared medicine column, taking the prepared medicine column out of the mould, cutting off redundant parts to enable the top surface of the prepared medicine column to be flat, and enabling the top surface of the prepared medicine column to be parallel to the bottom surface of the prepared medicine column to obtain a primary medicine column;
secondary pressing: putting the primary explosive columns into a die, putting the die into a press machine, and pressurizing and pressing by a planar punch to obtain secondary explosive columns;
sintering the grain: and taking the secondary explosive column out of the mold, putting the secondary explosive column into a muffle furnace, introducing protective gas into the muffle furnace, heating the muffle furnace in a protective gas environment for firing, and cooling to obtain a finished product.
5. The process for preparing a honeycomb aluminum skeleton-reinforced aluminum/polytetrafluoroethylene active material according to claim 4, wherein in the step of pre-pressing with a filler, repeated pre-pressing is performed by the thimble array punch at a pressure of 1-2 MPa.
6. The process according to claim 4, wherein in the first-stage pressing step, the die is placed in a press, the pressure is increased to 200-220MPa at a pressure increasing rate of 35-45MPa/min, and the pressure is maintained for 5-10min, so that the first-stage grain is obtained.
7. The process according to claim 4, wherein in the secondary pressing, the primary charge is placed in a mold, the mold is placed in a press, the pressure is increased to 200-220MPa at a pressure increasing rate of 40-45MPa/min, the pressure is maintained for 5-10min, and the secondary charge is obtained by pressing.
8. The preparation process of the honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material according to claim 4, characterized in that in the step of sintering the grain, protective gas is introduced into a muffle furnace, the flow of the protective gas is 20-25L/min, the temperature is raised to 300-350 ℃ at the temperature rise rate of 1-1.5 ℃/min under the protective gas environment, then the temperature is raised to 350-400 ℃ at the temperature rise rate of 0.5-1 ℃/min, the temperature is kept for 30-60min, then the temperature is lowered to 350-300 ℃ at the temperature reduction rate of 0.5-1 ℃/min, the temperature is kept for 30-60min, then the temperature is lowered to 100-90 ℃ at the temperature reduction rate of 1-2 ℃/min, and finally the raw material is naturally cooled to room temperature in the muffle furnace to obtain a finished product.
9. The process of claim 4, wherein the protective gas is nitrogen.
10. The preparation process of the honeycomb aluminum framework reinforced aluminum/polytetrafluoroethylene active material according to claim 4, wherein the press machine is a YLJ-50 press machine.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112694374A (en) * | 2020-11-26 | 2021-04-23 | 沈阳理工大学 | Short fiber reinforced aluminum/polytetrafluoroethylene active material and preparation process thereof |
| CN113953520A (en) * | 2021-10-26 | 2022-01-21 | 中南大学 | Modified aluminum powder, preparation method and application thereof |
| CN113953520B (en) * | 2021-10-26 | 2022-09-06 | 中南大学 | Modified aluminum powder, preparation method and application thereof |
| CN114872271A (en) * | 2022-04-24 | 2022-08-09 | 江苏理工学院 | Preparation method of continuous nickel net reinforced aluminum/polytetrafluoroethylene energetic material structural member |
| CN114872271B (en) * | 2022-04-24 | 2023-05-23 | 江苏理工学院 | Preparation method of continuous nickel screen reinforced aluminum/polytetrafluoroethylene energetic material structural member |
| CN115536481A (en) * | 2022-10-08 | 2022-12-30 | 北京理工大学 | Preparation method of aluminum fiber reinforced aluminum/polytetrafluoroethylene energetic material |
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