CN105834354A - High-hardness anti-cracking mica powder modified silica matrix EPC coating and preparation method thereof - Google Patents
High-hardness anti-cracking mica powder modified silica matrix EPC coating and preparation method thereof Download PDFInfo
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- CN105834354A CN105834354A CN201610359450.9A CN201610359450A CN105834354A CN 105834354 A CN105834354 A CN 105834354A CN 201610359450 A CN201610359450 A CN 201610359450A CN 105834354 A CN105834354 A CN 105834354A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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Abstract
The invention discloses a high-hardness anti-cracking mica powder modified silica matrix EPC coating. The high-hardness anti-cracking mica powder modified silica matrix EPC coating is prepared from the following raw materials in parts by weight: 100-102 parts of silica powder, 0.9-1.1 parts of modified starch, 0.9-1.1 parts of carboxymethyl cellulose, 2.4-2.6 parts of sodium bentonite, 0.9-1 part of mica powder, 0.8-0.9 part of tetrapod-shaped ZnO whiskers, 0.9-1.1 parts of silica sol, 10-13 parts of ethyl alcohol, an appropriate amount of water, 0.8-1 part of lamellar niobium pentoxide, 2-2.5 parts of graphite foam and 2-2.5 parts of nanometer aluminum oxide. According to the high-hardness anti-cracking mica powder modified silica matrix EPC coating, by utilizing the lamellar niobium pentoxide and the graphite foam, passages can be provided for gas emission during casting, so that cast blebs are reduced; meanwhile, spatial interveined arrangement is formed by the composition, and a stable structure is formed, so that the hardness and bending strength of the coating are improved; and furthermore, the heat dissipation performance of the lamellar niobium pentoxide, the graphite foam and the nanometer aluminum oxide is good, so that the phenomenon of partial cracking of the coating caused by sudden heating is reduced.
Description
Technical field
The present invention relates to lost foam paint technical field, particularly relate to a kind of high rigidity crack resistence mica powder modification quartz group lost mould coating and preparation method thereof.
Background technology
Lost foam casting is the foundry engieering of a kind of Near net shape, and coating is the key point of lost foam casting, and the quality of coating property is directly connected to the quality of foundry goods.Lost foam paint is typically made up of refractory aggregate, binding agent, suspending agent, carrier, additive.Silica flour is widely used on lost foam casting as refractory aggregate cheap and easy to get, but because sintering character is poor so that it is application receives certain restriction.And the principle that lost foam paint is at the beginning of design should sinter exactly, peel off again.If sintering character can be poor under pouring temperature for refractory aggregate, then can not form the liquid phase of q.s.So coating cannot form densification and have the sinter layer of sufficient intensity, bears incessantly molten metal washing away when cast, corrosion function, and molten metal can pass through coating erosion casting mold, and foundry goods is easily generated the defects such as scab.Even if not causing scab the most easily to produce coating be bonded at the phenomenon being not easily stripped on foundry goods.The major measure improving lost foam paint sintering character has: 1. introduce suitable sintering aid, utilizes the liquid phase that sintering aid is formed, and reaches the purpose accelerating material diffusion with acceleration of sintering；2. formed composite aggregate, fusing point reduction and the temperature starting to sinter by the refractory aggregate that fusing point is different also to decrease.If selecting suitable composite aggregate and proportioning, then coating can be made to produce a certain degree of sintering under pouring temperature.This problem uses mica powder to improve the sintering character of quartz group lost mould coating as sintering aid." mica powder impact on quartz group lost mould coating sintering character " literary composition have developed a kind of lost foam paint with high refractoriness and low grade fever's node, and this coating has good sintering character and stripping performance.
But Muscovitum bad dispersibility in coating, suspension are poor, easily cause the bending strength after sintering uneven, and stripping performance is the most uneven, and Muscovitum slabbing, can obstructing air holes, affect gas and discharges, cause bleb phenomenon, need improvement.
Additionally also need to improve the problems such as the hardness of coating, compactness, elevated temperature strength, crack resistance, breathability, bending strength, sag resistance, brushing performance, agglutinating property along with the progress of foundry engieering.
Summary of the invention
The object of the invention is contemplated to make up the defect of prior art, it is provided that a kind of high rigidity crack resistence mica powder modification quartz group lost mould coating and preparation method thereof.
The present invention is achieved by the following technical solutions:
A kind of high rigidity crack resistence mica powder modification quartz group lost mould coating, is prepared by the raw materials in: silica flour 100-102, modified starch 0.9-1.1, carboxymethyl cellulose 0.9-1.1, sodium bentonite 2.4-2.6, mica powder 0.9-1, four acicular type zinc oxide crystal whisker 0.8-0.9, Ludox 0.9-1.1, ethanol 10-13, water are appropriate, lamellar niobium pentaoxide 0.8-1, graphite foam 2-2.5, nano aluminium oxide 2-2.5.
The preparation method of described high rigidity crack resistence mica powder modification quartz group lost mould coating, comprises the following steps:
(1) Ludox is added in ethanol, stir, add mica powder to stir, be heated to 60-70 DEG C, add four acicular type zinc oxide crystal whisker while stirring, it is heated to 70-75 DEG C, ultrasonic disperse 3-4 minute, continues stirring complete to ethanol volatilization, pulverizes, cross 100-150 mesh sieve, obtain modified micaceous powder；
(2) by lamellar niobium pentaoxide, graphite foam mixing, grinding uniformly, add nano aluminium oxide, vibrations stirring 30-40 minute, obtains powder repeatedly；
(3) modified starch, carboxymethyl cellulose, sodium bentonite are added to the water, stir, add described modified micaceous powder and described powder, stir, obtain mixed material；
(4) described mixed material and other leftover materials are mixed into pasty state, to obtain final product.
The invention have the advantage that the present invention uses Ludox, four acicular type zinc oxide crystal whisker to be modified mica powder, define on mica powder surface nano silicon and and four acicular type zinc oxide crystal whisker, the dispersion stabilization making mica powder improves, and whisker can improve the caking property of mica powder and silica flour, improve cracking resistance, there is whisker to support after sintering and define uniform pore, promote that gas is discharged, reduce bleb.By using lamellar niobium pentaoxide, graphite foam, owing to being board and porous body combination, define big surface area and inner space, mix with nano aluminium oxide again so that nano aluminium oxide is filled in hole, offer passage can be distributed for gas when casting, reduce bleb, the most this spatial intersecting that collectively form is arranged, and defines stable structure, thus improves hardness and the bending strength of coating；It addition, the thermal diffusivity of lamellar niobium pentaoxide, graphite foam, nano aluminium oxide is good, it is possible to reduce coating is heated suddenly and is caused Local Cracking phenomenon.
Detailed description of the invention
A kind of high rigidity crack resistence mica powder modification quartz group lost mould coating, is made up of the raw material of following weight portion (kilogram): silica flour 100, modified starch 0.9, carboxymethyl cellulose 0.9, sodium bentonite 2.4, mica powder 0.9, four acicular type zinc oxide crystal whisker 0.8, Ludox 0.9, ethanol 10, water are appropriate, lamellar niobium pentaoxide 0.8, graphite foam 2, nano aluminium oxide 2.
The preparation method of described high rigidity crack resistence mica powder modification quartz group lost mould coating, comprises the following steps:
(1) Ludox is added in ethanol, stir, add mica powder and stir, be heated to 60 DEG C, add four acicular type zinc oxide crystal whisker while stirring, be heated to 70 DEG C, ultrasonic disperse 3 minutes, continues stirring complete to ethanol volatilization, pulverize, cross 100 mesh sieves, obtain modified micaceous powder；
(2) by lamellar niobium pentaoxide, graphite foam mixing, grinding uniformly, add nano aluminium oxide, vibrations stirring 30 minutes, obtains powder repeatedly；
(3) modified starch, carboxymethyl cellulose, sodium bentonite are added to the water, stir, add described modified micaceous powder and described powder, stir, obtain mixed material；
(4) described mixed material and other leftover materials are mixed into pasty state, to obtain final product.
Being sintered at 1500 DEG C by this embodiment lost foam paint, observed by microscope, internal a small amount of macroscopic void and the most tiny small holes, in a block entirety, fissility has reached I grade, and bending strength is 9.1MPa.
Claims (2)
1. a high rigidity crack resistence mica powder modification quartz group lost mould coating, it is characterised in that: it is prepared by the raw materials in: silica flour 100-102, modified starch 0.9-1.1, carboxymethyl cellulose 0.9-1.1, sodium bentonite 2.4-2.6, mica powder 0.9-1, four acicular type zinc oxide crystal whisker 0.8-0.9, Ludox 0.9-1.1, ethanol 10-13, water are appropriate, lamellar niobium pentaoxide 0.8-1, graphite foam 2-2.5, nano aluminium oxide 2-2.5.
The preparation method of high rigidity crack resistence mica powder modification quartz group lost mould coating the most according to claim 1, it is characterised in that comprise the following steps:
(1) Ludox is added in ethanol, stir, add mica powder to stir, be heated to 60-70 DEG C, add four acicular type zinc oxide crystal whisker while stirring, it is heated to 70-75 DEG C, ultrasonic disperse 3-4 minute, continues stirring complete to ethanol volatilization, pulverizes, cross 100-150 mesh sieve, obtain modified micaceous powder；
(2) by lamellar niobium pentaoxide, graphite foam mixing, grinding uniformly, add nano aluminium oxide, vibrations stirring 30-40 minute, obtains powder repeatedly；
(3) modified starch, carboxymethyl cellulose, sodium bentonite are added to the water, stir, add described modified micaceous powder and described powder, stir, obtain mixed material；
(4) described mixed material and other leftover materials are mixed into pasty state, to obtain final product.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610359450.9A CN105834354A (en) | 2016-05-27 | 2016-05-27 | High-hardness anti-cracking mica powder modified silica matrix EPC coating and preparation method thereof |
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| CN201610359450.9A CN105834354A (en) | 2016-05-27 | 2016-05-27 | High-hardness anti-cracking mica powder modified silica matrix EPC coating and preparation method thereof |
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| CN105834354A true CN105834354A (en) | 2016-08-10 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107486544A (en) * | 2017-08-22 | 2017-12-19 | 安徽大卫模具有限公司 | A kind of lost foam casting process |
| CN112517837A (en) * | 2020-12-07 | 2021-03-19 | 安徽信息工程学院 | Aluminum bronze lost foam casting environment-friendly coating and preparation method thereof |
| CN112517836A (en) * | 2020-12-07 | 2021-03-19 | 安徽信息工程学院 | Tin bronze lost foam casting environment-friendly coating and preparation method thereof |
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| CN103447454A (en) * | 2013-08-26 | 2013-12-18 | 宁夏共享集团有限责任公司 | Water-based paint of lost foam for iron casting, and production method of water-based paint |
| CN103658508A (en) * | 2013-11-26 | 2014-03-26 | 阜阳市富鑫铸造机械有限公司 | Cast steel lost foam coating formula |
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Patent Citations (5)
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| CN103447454A (en) * | 2013-08-26 | 2013-12-18 | 宁夏共享集团有限责任公司 | Water-based paint of lost foam for iron casting, and production method of water-based paint |
| CN103658508A (en) * | 2013-11-26 | 2014-03-26 | 阜阳市富鑫铸造机械有限公司 | Cast steel lost foam coating formula |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107486544A (en) * | 2017-08-22 | 2017-12-19 | 安徽大卫模具有限公司 | A kind of lost foam casting process |
| CN112517837A (en) * | 2020-12-07 | 2021-03-19 | 安徽信息工程学院 | Aluminum bronze lost foam casting environment-friendly coating and preparation method thereof |
| CN112517836A (en) * | 2020-12-07 | 2021-03-19 | 安徽信息工程学院 | Tin bronze lost foam casting environment-friendly coating and preparation method thereof |
| CN112517836B (en) * | 2020-12-07 | 2022-04-08 | 安徽信息工程学院 | Tin bronze lost foam casting environment-friendly coating and preparation method thereof |
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