Method for preparing compact yttria ceramics

Abstract

The invention relates to technology for preparing ceramics, in particular to a method for preparing compact yttria ceramics. The method comprises the following steps: adding 0 to 20 mol percent of a sintering auxiliary agent; and heating at a temperature of between 1,100 and 1,800 DEG C to obtain the compact yttria ceramics with the relative density over 92 percent. The technology is characterized in that a small amount of sintering auxiliary agent is added to obtain a compact yttria ceramics material at a lower heating temperature.

Description

Technical field: [0001] The invention relates to ceramic preparation technology, in particular to a method for preparing dense yttrium oxide ceramics. Background technique: [0002] my country's yttrium oxide reserves are 720,000 tons, which is the country with the most abundant reserves in the world. The development and utilization of yttrium oxide can not only increase the development and utilization of rich yttrium oxide resources in my country, but also improve the production and consumption structure of yttrium oxide in China, and enhance the competitiveness of my country and developed countries in the development and utilization of new materials. [0003] On the other hand, titanium and titanium alloys are extremely important structural and functional materials, and have very important application value and broad application prospects in the fields of aviation, aerospace, vehicle engineering, and biomedical engineering. In addition, titanium and titanium alloy casting...

AI Technical Summary

Problems solved by technology

However, due to the high chemical activity of titanium in the molten state, it is easy to chemically react with refractory materials during the casting process, which deteriorates the surface quality of the casting and reduces the mechanical properties, so the melting and casting of titanium and titanium alloys are difficult. , Improving the corrosion resistance of refractories plays a decisive role in the development of titanium industry

Although graphite, metal oxides (zirconia, calcium oxide, yttrium oxide, etc.) and other refractory materials can basically meet the requirements, there are two main defects: one is the formation of a reaction layer on the surface of the casting, which affects the surface quality of the casting; the other On the one hand, due to chemical erosion during the melting and casting process, the performance of refractory materials is reduced and the service life is reduced

However, the melting point of yttrium oxide is high, and it is difficult to prepare dense yttrium oxide ceramic materials. The application of yttrium oxide crucibles in the titanium industry is very small, so the preparation of dense yttrium oxide ceramics is of great significance.