A kind of reinforced and stable yttrium oxide slurry and its preparation method

Abstract

The invention provides a strengthened and stable yttrium oxide slurry and a preparation method thereof. The slurry comprises the following components in parts by weight: 10-15 parts of yttrium oxide glue; 3-8 parts of organic latex; 3-8 parts of deionized water ; 70-80 parts of yttrium oxide powder, 1-5 parts of stabilizer, 0.03-0.05 part of wetting agent; 0.03-0.05 part of defoamer; the stabilizer is zirconia and / or alumina powder. The present invention successfully improves the stability of the slurry by adding a stabilizer to the yttrium sol + yttrium oxide powder slurry with the highest inertness and worst stability, and improves the bonding strength of the slurry by adding an organic adhesive. In this way, a yttrium oxide slurry with high strength and stable performance is prepared, and a high-quality yttrium oxide surface layer mold shell with a smooth and complete inner surface is further obtained, which is used for investment precision casting of titanium alloys, high-temperature alloys, and zirconium alloys.

Description

technical field [0001] The invention belongs to the technical field of alloy casting, and in particular relates to a strengthened and stable yttrium oxide slurry and a preparation method thereof. Background technique [0002] High-temperature alloys, titanium alloys, and zirconium alloys are high-strength, corrosion-resistant metal materials widely used in aerospace, marine, and other fields, and investment casting is usually used to achieve near-net shape. Since this type of material, especially titanium alloy, contains a large amount of highly chemically active metal elements such as titanium, aluminum, zirconium, niobium and rare earth, it is easy to chemically react with the crucible and the mold shell during the alloy melting and filling process. Contamination layers are formed, and oxide inclusions are generated inside the casting, which reduces the yield of the casting and damages the mechanical properties of the material. Therefore, it is the field to develop a high...

AI Technical Summary

Problems solved by technology

[0003] The yttrium oxide surface layer formwork is currently the most inert ceramic formwork in the field of titanium alloy precision casting. At present, nano-silica sol + yttrium oxide powder slurry, zirconium acetate + yttrium oxide slurry and yttrium sol + yttrium oxide powder have been developed in the world. Slurry and other technologies, but there are shortcomings such as too thick stained layer, or short life of the material or unstable performance, so it cannot be industrialized.

Among them, the yttrium oxide glue + yttrium oxide powder slurry technology is the most inert, and the development prospect is promising. However, due to its low strength, easy gelation, instability, and poor processability, the life of the slurry is short, and the surface layer of the prepared formwork is easy to crack. Problems such as melting and remelting lead to powder falling, peeling and peeling on the inner surface of the mold shell, and the product quality is difficult to control, which seriously affects the quality of castings such as titanium alloys.