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Anti-crack modified quartz-based mica powder full mold paint and preparation method thereof

A mica powder and lost foam technology, applied in coatings, manufacturing tools, casting and molding equipment, etc., can solve the problems of uneven bending strength, uneven peeling performance, affecting gas discharge, etc. Spalling properties, the effect of reducing porosity in castings

Inactive Publication Date: 2016-08-03
MAANSHAN XINGLONG FOUNDRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the poor dispersion and suspension of mica in the coating can easily lead to uneven flexural strength after sintering and uneven peeling performance, and the mica becomes flakes, which will block the pores, affect the gas discharge, and cause the pores of the casting, which needs to be improved.

Method used

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Embodiment Construction

[0014] A crack-resistant mica powder modified quartz-based lost foam coating, made of the following raw materials in parts by weight (kg): quartz powder 100, modified starch 0.9, carboxymethyl cellulose 0.9, sodium bentonite 2.4, mica powder 0.9 , four-needle zinc oxide whisker 0.8, silica sol 0.9, ethanol 10, appropriate amount of water, nano-spherical alumina 0.4, straw powder 0.7, 20wt% sodium hydroxide solution 4.

[0015] The preparation method of described crack-resistant mica powder modified quartz-based lost foam coating, comprises the following steps:

[0016] (1) Add silica sol to ethanol, stir evenly, then add mica powder and stir evenly, heat to 60°C, add four needle-shaped zinc oxide whiskers while stirring, heat to 70°C, ultrasonically disperse for 3 minutes, continue stirring until After ethanol volatilization is completed, pulverize and pass through a 100-mesh sieve to obtain modified mica powder;

[0017] (2) Mix straw powder with 20wt% sodium hydroxide solut...

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Abstract

The invention discloses anti-crack modified quartz-based mica powder full mold paint. The anti-crack modified quartz-based mica powder full mold paint is prepared from, by weight, 100-102 parts of quartz powder, 0.9-1.1 parts of modified starch, 0.9-1.1 parts of carboxymethylcellulose, 2.4-2.6 parts of sodium bentonite, 0.9-1 part of mica powder, 0.8-0.9 part of tetrapod-like zinc oxide whiskers, 0.9-1.1 parts of silica sol, 10-13 parts of ethanol, a proper amount of water, 0.4-0.5 part of nano spherical aluminum oxide, 0.7-0.8 part of straw powder and 4-5 parts of sodium hydroxide solution with the concentration being 20-25w%. According to the anti-crack modified quartz-based mica powder full mold paint, the nano spherical aluminum oxide and the straw powder are used, and the straw powder is modified, so that the crack resistance of the paint is improved; in addition, the nano spherical aluminum oxide is used for modification, so that the heat resistance of the straw powder is improved, and the situation that sudden carbonization occurs during casting, a large amount of gas is released, and consequentially air holes of a casting are caused is avoided; and furthermore, the strength and smooth finish of the paint after sintering are improved, and the spalling resistance is improved.

Description

technical field [0001] The invention relates to the technical field of lost foam coatings, in particular to an anti-cracking mica powder modified quartz-based lost foam coating and a preparation method thereof. Background technique [0002] Lost foam casting is a casting technology with almost no margin, and coating is the key point of lost foam casting. The performance of coating is directly related to the quality of castings. Lost foam coatings generally consist of refractory aggregates, binders, suspending agents, carriers, and additives. As a cheap and easy-to-obtain refractory aggregate, quartz powder is widely used in lost foam casting, but its application is limited due to its poor sintering performance. The principle of the lost foam coating at the beginning of the design is to sinter and peel off. If the sintering performance of the refractory aggregate is poor at the pouring temperature, a sufficient amount of liquid phase cannot be formed. Then the coating cann...

Claims

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Application Information

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IPC IPC(8): B22C3/00
CPCB22C3/00
Inventor 张家俊
Owner MAANSHAN XINGLONG FOUNDRY CO LTD
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