CN110819303A - Diamond grinding fluid and preparation method thereof - Google Patents
Diamond grinding fluid and preparation method thereof Download PDFInfo
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- CN110819303A CN110819303A CN201911139689.5A CN201911139689A CN110819303A CN 110819303 A CN110819303 A CN 110819303A CN 201911139689 A CN201911139689 A CN 201911139689A CN 110819303 A CN110819303 A CN 110819303A
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Abstract
The invention belongs to the technical field of grinding of superhard materials, and particularly relates to a diamond grinding fluid and a preparation method thereof, wherein the preparation method of the diamond grinding fluid comprises the following steps of (1) diamond pretreatment, ①, wherein 40-80 parts by weight of diamond, 5-10 parts by weight of manganese dioxide, 5-10 parts by weight of ferric oxide and 30-60 parts by weight of silicon carbide are uniformly mixed, ② is used for roasting ① materials at the temperature of 790 ℃, ③ is used for cooling ② materials to room temperature, selecting diamond and cleaning and drying the diamond, 2) grinding fluid is prepared by ① according to parts by weight, 0.05-0.15 part of calcium chloride and 1.2-3.6 parts of sodium carbonate are dissolved in 100 parts of water and then 10 parts of pretreated diamond are added, ② is used for preparing reagent B, 0.2-0.4 part of sodium carboxymethyl cellulose and 5.0-15 parts of citric acid are dissolved in 50 parts of water, ③ B is poured into A, and the grinding fluid is uniformly stirred, and the grinding fluid is prepared by a simple grinding process of firstly and then uniformly stirred.
Description
Technical Field
The invention belongs to the technical field of superhard material grinding, and particularly relates to a diamond grinding fluid and a preparation method thereof.
Background
The diamond grinding fluid has high grinding strength and no dust and other harmful substance pollution, and is widely used for grinding workpieces made of materials such as metal, ceramics, glass and the like. In the prior art, the grinding material is super-hard grinding material micro-powder, such as artificial diamond, silicon carbide and the like, and the traditional method for adding the super-hard grinding material micro-powder is to add the grinding material micro-powder on a grinding disc in a manner of manually scattering and adding material and adding water for cooling, but the manual feeding quantity and the feeding uniformity are not easy to control. In addition, small diamond particles are easily made into a suspension, and the difficulty in suspending larger diamond particles limits their use in grinding fluid applications. Meanwhile, the diamond particles in the existing diamond grinding fluid play a grinding role, namely the edges and corners of the hexaoctahedron diamond abrasive grain crystals, and the sharpness is limited.
The invention creates a diamond edge increasing method, namely, the surface of the diamond is processed into a rough surface with countless pits, thereby greatly improving the grinding efficiency.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a diamond grinding fluid, and when the grinding fluid is used for grinding a workpiece, the grinding efficiency is improved.
The invention also provides a preparation method of the diamond grinding fluid, which is characterized in that diamond is pretreated and then the grinding fluid is prepared, so that the process is simple and easy to control.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a preparation method of a diamond grinding fluid comprises the following steps:
(1) pretreatment of diamond
① mixing diamond 40-80 weight parts, manganese dioxide 5-10 weight parts, ferric oxide 5-10 weight parts, and silicon carbide 30-60 weight parts;
② roasting the material ① at 750-790 deg.c;
③ cooling the material ② to room temperature, screening out diamond, cleaning and drying to obtain pretreated diamond, and forming holes on the pretreated diamond surface to attach bubbles, thereby increasing the granularity and sharpness of the diamond.
(2) Preparation of grinding fluid
① preparing reagent A, dissolving 0.05-0.15 part of calcium chloride and 1.2-3.6 parts of sodium carbonate in 100 parts of water by weight, and then adding 10 parts of pretreated diamond obtained by the step (1);
② preparing reagent B by dissolving 0.2-0.4 part of sodium carboxymethylcellulose and 5.0-15 parts of citric acid in 50 parts of water;
③ and pouring the reagent B into the reagent A and stirring uniformly to obtain the diamond grinding fluid.
Preferably, the particle size of diamond is 100-.
Preferably, the particle sizes of the manganese dioxide, the iron oxide and the silicon carbide are all less than 50 μm.
Preferably, in the step (1) diamond pretreatment, the material obtained in the step ② is roasted at the temperature of 750-790 ℃ and is subjected to heat preservation for 3-8 min.
Preferably, step ② of the diamond pretreatment of step (1) is to flatten the material to a thickness of no more than 10mm during firing.
The diamond grinding fluid prepared by the method is used.
Manganese dioxide, iron oxide and silicon carbide are respectively used as an oxidation catalyst, an oxidant and a diluting separant, and when the roasting in the step (1) is carried out, the iron oxide reacts with diamond (carbon) to generate pits on the surface of diamond particles; the part of the silicon carbide contacted with the diamond does not react, and no pit is formed on the surface of the diamond. Step (2) through the configuration of A, B reagent, A, B two reagents react to release air bubbles, and the air bubbles enter the diamond pits processed in step (1), so that the purpose of suspending abrasive particles (namely, diamond) is achieved when the diamond pits are used.
The principle of the invention is as follows: the diamond grinding fluid is actually suspension of diamond abrasive particles, and dust pollution caused by solid grinding can be eliminated. The existing grinding fluid utilizes the principle of increasing the density and viscosity of the solution to suspend abrasive particles regardless of the formula. On the basis of increasing solution density and viscosity, the abrasive particle state is changed through abrasive particle roasting, so that the abrasive particle surface is increased in edge, the opportunity that air bubbles are easily absorbed by a plurality of pits of abrasive particles is created, two formulas capable of generating air bubbles after mixing are prepared, and the purpose of coarse abrasive particle suspension is achieved. When the abrasive particles are sprayed to the workpiece, the abrasive particle cutting edge is mostly sharp, the coarse kinetic energy of the abrasive particles is large (in a momentum formula E, E is the abrasive particle momentum, M is the abrasive particle mass, and V is the abrasive particle spraying speed), and the grinding efficiency is improved.
In the step (1), the diamond and the powder formula (i.e. manganese dioxide, iron oxide and silicon carbide) are roasted at the stage temperature of 750-. If the temperature is lower than 750 ℃, the catalyst in the powder loses activity, the material cannot reach the conversion critical point, and the diamond is not changed after being cooled; without contacting the diamond surface with a conversion catalyst, the temperature threshold for conversion to graphite would be significantly above 790 ℃, which would result in the entire (internal) diamond crystal being converted to graphite and thus reduced in strength. Excessive loss occurs when the temperature is higher than 790 ℃ or the time is longer than 8min in the presence of the catalyst.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention treats the surface of the diamond into a rough surface with countless pits, increases the edge of the surface of the abrasive particles, creates the opportunity that the abrasive particles with a plurality of pits are easy to absorb bubbles, prepares two formulas which can generate bubbles after being mixed, and achieves the aim of more roughly grinding the suspension of the abrasive particles;
2. roasting at 750-790 deg.c for 3-8min to form pores on the surface of diamond, and adhering the bubbles produced in the subsequent steps to the pores to increase the granularity and sharpness of diamond;
3. when the grinding fluid prepared by the method is used for grinding workpieces such as metal, ceramic, glass and the like, compared with the traditional process, the grinding efficiency can be improved by more than two times.
Drawings
FIG. 1 is a photomicrograph of the pretreated diamond of example 1;
figure 2 is a photomicrograph of diamond without pretreatment.
Detailed Description
The invention is further illustrated, but not limited, by the following examples and the accompanying drawings.
Example 1
The preparation method of the diamond grinding fluid comprises the following steps:
(1) pretreatment of diamond
① mixing diamond 40 weight parts, manganese dioxide 5 weight parts, ferric oxide 5 weight parts, and silicon carbide 30 weight parts;
the granularity of the diamond is 120/140, wherein the median grain diameter is 120 μm, and the grain diameters of manganese dioxide, ferric oxide and silicon carbide are all less than 20 μm;
② spreading the material ① in a ceramic disc with a thickness of no more than 10mm, then putting the ceramic disc with the material in a muffle furnace, heating to 750 ℃, and keeping the temperature for 3 min;
③ cooling the muffle furnace to below 60 deg.C, taking out the ceramic disc containing the material in step ②, cooling to room temperature, sieving with 140 mesh sieve, cleaning the screened diamond with water, and oven drying to obtain pretreated diamond;
(2) preparation of grinding fluid
① reagent A is prepared by dissolving 0.05 part of calcium chloride and 1.2 parts of sodium carbonate in 100 parts of deionized water, and then adding 10 parts of pretreated diamond;
② preparing reagent B by dissolving 0.2 parts of sodium carboxymethylcellulose and 5.0 parts of citric acid in 50 parts of deionized water;
③ before use, the agent B is poured into the agent A and stirred evenly to obtain the diamond grinding fluid.
A photomicrograph of the pre-treated diamond of this example is shown in fig. 1, and it can be seen from fig. 1 that the diamond (abrasive grain) surface is rough and has numerous point-like or stripe-like protruding grinding edges. FIG. 2 is a photomicrograph of the raw diamond in step (1), in which the diamond surface is smooth and its hexaoctahedral edges are the grinding edges. It can be seen that the pretreated diamond surface grinding edge is greatly improved.
The grinding rates of the workpieces (YG8 and SiC sintered blank) ground with the grinding fluid of example 1 are shown in Table 1.
Example 2
The preparation method of the diamond grinding fluid comprises the following steps:
(1) pretreatment of diamond
① mixing 80 parts of diamond, 10 parts of manganese dioxide, 10 parts of ferric oxide and 60 parts of silicon carbide;
the diamond has a particle size of 30/35, wherein the median particle size is 485 μm, and the particle sizes of manganese dioxide, ferric oxide and silicon carbide are all less than 50 μm;
② spreading the material ① in a ceramic plate with a thickness of no more than 10mm, placing the ceramic plate with the material in a muffle furnace, heating to 790 ℃, and keeping the temperature for 8 min;
③ cooling the muffle furnace to below 60 deg.C, taking out the ceramic disc containing the material in step ②, cooling to room temperature, sieving with 60 mesh sieve, cleaning the screened diamond with water, and oven drying to obtain pretreated diamond;
(2) preparation of grinding fluid
① reagent A is prepared by dissolving 0.15 part of calcium chloride and 3.6 parts of sodium carbonate in 100 parts of deionized water by weight, and then adding 10 parts of pretreated diamond;
② preparing reagent B by dissolving 0.4 parts of sodium carboxymethylcellulose and 15 parts of citric acid in 50 parts of deionized water;
③ before use, the agent B is poured into the agent A and stirred evenly to obtain the diamond grinding fluid.
Example 3
The preparation method of the diamond grinding fluid comprises the following steps:
(1) pretreatment of diamond
① mixing diamond 60 parts, manganese dioxide 7.5 parts, ferric oxide 7.5 parts, and silicon carbide 45 parts;
the diamond has a particle size of 70/80, wherein the median particle size is 200 μm, and the particle sizes of manganese dioxide, ferric oxide and silicon carbide are all less than 40 μm;
② spreading the material ① in a ceramic disc with a thickness of no more than 10mm, then putting the ceramic disc with the material in a muffle furnace, heating to 770 ℃ and keeping the temperature for 5 min;
③ cooling the muffle furnace to below 60 deg.C, taking out the ceramic disc containing the material in step ②, cooling to room temperature, sieving with 100 mesh sieve, cleaning the screened diamond with water, and oven drying to obtain pretreated diamond;
(2) preparation of grinding fluid
① reagent A is prepared by dissolving 0.1 part of calcium chloride and 2.4 parts of sodium carbonate in 100 parts of deionized water by weight, and then adding 10 parts of pretreated diamond;
② preparing reagent B by dissolving 0.3 part of sodium carboxymethylcellulose and 10 parts of citric acid in 50 parts of deionized water;
③ before use, the agent B is poured into the agent A and stirred evenly to obtain the diamond grinding fluid.
It should be noted that, in order to fully achieve the best grinding effect, the storage time of the prepared diamond grinding fluid is generally not more than 48h, and the sufficiency of bubbles in the holes of the pretreated diamond is ensured.
Comparative example 1
A diamond abrasive polishing paste produced by Haotai measuring instruments, Inc. of Dongguan was used as comparative example 1, and a workpiece (YG8 and SiC sintered blank) was ground using the polishing paste.
Comparative example 2
PP-3-032 Diamond polishing liquid from QMAXIS corporation, USA, was used as comparative example 2, and the work pieces (YG8 and SiC sintered blank) were ground using the polishing liquid.
The grinding rates of the grinding fluids of example 1 and comparative examples 1-2 for grinding the workpieces (YG8 and SiC sintered blank) are shown in table 1.
Table 1 grinding rate table of grinding fluid grinding workpieces of examples and comparative examples
As can be seen from Table 1, the diamond particles and the surface morphology changed significantly after the diamond was pretreated by the method of the present invention. The grinding rate of the grinding fluid for grinding the workpiece is more than 2 times of that of the grinding fluid sold in the conventional common market (comparative example 1 and comparative example 2), so that the grinding efficiency is greatly improved.
Claims (6)
1. The preparation method of the diamond grinding fluid is characterized by comprising the following steps:
(1) pretreatment of diamond
① mixing diamond 40-80 weight parts, manganese dioxide 5-10 weight parts, ferric oxide 5-10 weight parts, and silicon carbide 30-60 weight parts;
② roasting the material ① at 750-790 deg.c;
③, cooling the material ② to room temperature, screening out diamonds, cleaning and drying to obtain pretreated diamonds;
(2) preparation of grinding fluid
① preparing reagent A, dissolving 0.05-0.15 part of calcium chloride and 1.2-3.6 parts of sodium carbonate in 100 parts of water by weight, and then adding 10 parts of pretreated diamond to obtain reagent A;
② preparing reagent B by dissolving 0.2-0.4 part of sodium carboxymethylcellulose and 5.0-15 parts of citric acid in 50 parts of water by weight to obtain reagent B;
③ and pouring the reagent B into the reagent A and stirring uniformly to obtain the diamond grinding fluid.
2. The method for preparing a diamond grinding fluid according to claim 1, wherein the grain size of diamond is 100-500 μm.
3. The method for preparing the diamond grinding fluid according to claim 1, wherein the particle sizes of the manganese dioxide, the iron oxide and the silicon carbide are all less than 50 μm.
4. The method for preparing the diamond grinding fluid as claimed in claim 1, wherein the step ② material in the step (1) diamond pretreatment is baked at 750-790 ℃ and is kept warm for 3-8 min.
5. The method for preparing the diamond grinding fluid according to the claim 1, wherein the step ② in the step (1) diamond pretreatment is to flatten the material to a thickness of not more than 10mm during the firing.
6. A diamond grinding fluid prepared by the method of any one of claims 1 to 5.
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Cited By (1)
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| CN114715853A (en) * | 2022-03-22 | 2022-07-08 | 湖南世纪垠天新材料有限责任公司 | Method for comprehensively utilizing cobalt-removing slag in zinc smelting process |
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