Method for preparing silica sol binding agent

A manufacturing method and technology of silica sol, which is applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of low residual strength and high temperature strength of the shell

Inactive Publication Date: 2008-01-02
ZHEJIANG YUDA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ideal silica sol adhesive for investment casting hopes that the high-temperature strength of the molded shell is high and the residual strength is low.
Obviously, above-mentioned two kinds of silica sol adhesives all have deficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] Take a silica sol by ion exchange method, its physical and chemical index is: density d 20℃ : 1.21g / cm 3 , average particle size Ds: 13.2nm, SiO 2 %=30.6%, according to the standard CICBA / D05.01-1999 "Test Method for Bending Strength of Investment Casting Shell" of China Foundry Association Precision Casting Branch, the high temperature strength of the shell is 5.5MPa, and the residual strength is 4.4Mpa ( The refractory material is mullite powder from Huaibei Mining Bureau).

[0012] Take a simple silicon silica sol, its physical and chemical index is: density d 20℃ : 1.21g / cm 3 , average particle size Ds: 13.3nm, SiO 2 %=30.6%, according to the standard CICBA / D05.01-1999 "Test Method for Bending Strength of Investment Casting Shell" of China Foundry Association Precision Casting Branch, the high temperature strength of the shell is 10.0MPa, and the residual strength is 7.1Mpa ( The refractory material is the same mullite powder from Huaibei Mining Bureau).

[00...

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Abstract

A silica sol adhesive for the investment casting is proportionally prepared from the simple silica sol and the ion-exchanging silica sol through mixing.

Description

technical field [0001] The invention relates to a method for manufacturing an adhesive, in particular to a method for manufacturing a silica sol adhesive. Background technique [0002] Investment casting is a special casting method with less cutting and no cutting. The castings produced by this method have high dimensional and geometric accuracy and smooth surface; it can save a lot of machining time and equipment, and improve the utilization rate of metal materials, so it is increasingly widely used in industrial production. [0003] There are three main binders for investment casting: water glass, silica sol and ethyl silicate. Among them, the performance of the silica sol adhesive is better than that of the water glass shell, and compared with the ethyl silicate adhesive, it has the advantages of good high-temperature strength of the shell, no need for ammonia drying, and no pollution to the atmospheric environment. , so it has gradually become the main binder material ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/18
Inventor 章浩龙
Owner ZHEJIANG YUDA CHEM IND
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