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Preparation method of fiber reinforced composite silica sol shell for investment casting

A fiber-reinforced composite and investment casting technology, which is applied to casting molding equipment, molds, and mold components, can solve the problems of high residual strength and low wet strength, reduce residual strength, improve production efficiency, and reduce mold. Effect of shell residual strength

Inactive Publication Date: 2016-04-06
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can solve the technical problems of low wet strength and high residual strength of silica sol shells used in investment casting

Method used

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  • Preparation method of fiber reinforced composite silica sol shell for investment casting
  • Preparation method of fiber reinforced composite silica sol shell for investment casting
  • Preparation method of fiber reinforced composite silica sol shell for investment casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0041] Embodiment 1, the preparation method of the fiber-reinforced composite silica sol mold shell for investment casting of the present invention includes the following steps in sequence: the following mass may also be referred to as weight. The following "h" can also be replaced by "hour".

[0042] 1), preparation of the surface coating, according to the mass ratio of the refractory powder zirconium powder and the silica sol in the surface coating as 3.2:1, add the zirconium powder into the silica sol, stir evenly, and add an appropriate amount of wetting agent and Defoamer, after continuous stirring for later use;

[0043] 2) Surface layer shell preparation, after cleaning the surface of the wax pattern with a wax pattern cleaning solution, immerse the wax pattern in the coating prepared in step 1 for 20-30 seconds, after taking it out, sprinkle sand and dry it to obtain the surface layer pattern;

[0044] 3), the preparation of the transition layer coating and the mold she...

Embodiment approach 2

[0054] Embodiment 2, the preparation method of the fiber-reinforced composite silica sol shell for investment casting of the present invention includes the following steps in sequence:

[0055] 1) Preparation of the surface coating, according to the mass ratio of the refractory powder zircon powder and the silica sol in the surface coating being 2.8:1, adding the zircon powder into the silica sol, stirring evenly, and adding an appropriate amount of wetting agent and Defoamer, after continuous stirring for later use;

[0056] 2) Surface layer shell preparation, after cleaning the surface of the wax pattern with a wax pattern cleaning solution, immerse the wax pattern in the coating prepared in step 1 for 20-30 seconds, after taking it out, sprinkle sand and dry it to obtain the surface layer pattern;

[0057] 3), the preparation of the transition layer coating and the mold shell, according to the mass ratio of the refractory powder mullite powder in the transition layer coatin...

Embodiment approach 3

[0067] Embodiment 3, the preparation method of the fiber-reinforced composite silica sol shell for investment casting of the present invention includes the following steps in sequence:

[0068] 1) Preparation of the surface coating, according to the mass ratio of the refractory powder zircon powder and silica sol in the surface coating to 3.4:1, add the zircon powder into the silica sol, stir evenly, and add an appropriate amount of wetting agent and Defoamer, after continuous stirring for later use;

[0069] 2) Surface layer shell preparation, after cleaning the surface of the wax pattern with a wax pattern cleaning solution, immerse the wax pattern in the coating prepared in step 1 for 20-30 seconds, after taking it out, sprinkle sand and dry it to obtain the surface layer pattern;

[0070] 3), the preparation of the transition layer coating and the mold shell, according to the mass ratio of the refractory powder mullite powder in the transition layer coating to the silica s...

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Abstract

The invention relates to a preparation method of a fiber reinforced compound silica sol shell for investment casting, which aims to solve the problem that a shell preparedin the prior art is low in humidity and strength, and comprises the sequential steps as follows: 1), surface layer coating preparation; 2), surface layer shell preparation; 3) transition layer coating and shell preparation; 4) back layer coating preparation, that is, adding mullite powder into silica sol according to the mass ratio of (2.2-3.0):1 of the fireproof mullite powder to the silica sol in the back layer coating, so that paste-shaped coating is obtained, and agitating; adding polypropylene fiber which is 0.4 percent-2.0 percent of the fireproof mullite powder in mass in the back layer coating into the agitated paste-shaped coating, enabling the polypropylene fiber to uniformly disperse, adding the silica sol once again so as to lower the mass ratio of the mullite powder to the silicon sol to (1.1-1.5):1, and continuously agitating the mixture for 2 h for stand-by application; selecting the polypropylene fiber with the diameter of Phi 30 mum-Phi 50 mum and length of 2mm-6mm; 5) back layer shell preparation; 6) slurry sealing; 7) calcination, cooling and tapping off. The preparation method has the advantages that the shell is high in humidity and strength, and low in shell residual strength; the high-temperature air permeability is not affected after the fiber is burned at a high temperature; the effect of improving metal liquid mold-filling capacity to a certain degree is achieved; the number of coating and smearing layers is decreased; the production efficiency is improved.

Description

technical field [0001] The invention relates to a method for preparing an investment pattern for casting, in particular to a method for preparing a fiber-reinforced composite silica sol mold shell for investment casting. Background technique [0002] In investment casting production, the quality of the mold shell determines the quality of the casting. Generally, the mold shell is required to have a high enough wet strength to prevent cracking of the mold shell during handling or dewaxing; high temperature strength prevents the mold shell from roasting and casting. Cracking; low residual strength for easy cleaning of castings. [0003] Silica sol shell has good surface quality and high high temperature strength, and is widely used in the production of investment casting castings, but its wet strength is low, drying is slow, and the shell making cycle is long. People usually adopt methods such as improving the shell-making process, using a variety of adhesives to harden alter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04B22C1/02
Inventor 吕凯刘向东路焱冯华胡蓉
Owner INNER MONGOLIA UNIV OF TECH
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