Suspending agent for water-based zirconium oxide coating for investment titanium casting and preparation method and application of suspending agent

Abstract

The invention discloses a suspending agent for water-based zirconium oxide coating for investment titanium casting, a preparation method and application of the suspending agent, and belongs to the field of manufacturing of high-precision shells during titanium alloy investment casting. According to a formula, the suspending agent consists of the following components in percentage by mass: 0.7 to 1.4 percent of sodium carboxymethylcellulose, 0.1 to 0.3 percent of anionic polyacrylamide, 0.2 to 0.6 percent of nano sodium bentonite and the balance of distilled water. The water-based coating which is high in suspending performance and uniform in coating and is used for a titanium alloy investment cast shell can be prepared; the suspending rate of the obtained coating is up to 95 percent and is improved by 20 percent as compared with the suspending rate of the coating without the suspending agent; furthermore, the adding amount of the suspending agent is very small, so the suspending agent is in limited contact with titanium liquid during casting and a formed titanium alloy cast pollution layer is relatively thin.

Description

technical field [0001] The invention belongs to the field of preparation of investment casting coatings, and in particular relates to a suspending agent for water-based zirconia coatings on the shell surface layer of titanium alloy investment precision casting molds and its preparation method and application. Background technique [0002] Titanium and titanium alloys have low density, high specific strength, wide operating temperature range, and excellent corrosion resistance. Since the 1950s, due to the urgent needs of aerospace technology, the titanium industry has developed rapidly. Now, titanium and titanium alloys are not only indispensable structural materials in the aerospace industry, but also widely used in shipbuilding, chemical industry, metallurgy, and medical treatment. [0003] However, due to the difficulty in processing titanium alloy parts, titanium parts forged by traditional plastic processing methods have large machining allowances, low metal utilization...

AI Technical Summary

Problems solved by technology

At present, the document "The Effect of Sodium Bentonite on the Suspension of Silica Sol Coatings" uses the addition of 1%wt sodium bentonite to improve the suspension of silica sol coatings. The reaction forms a thicker pollution layer

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