At present, the highest working temperature of the most mature and widely used niobium tungsten hafnium superalloy in the high temperature field is 1050 ~1150 ℃, which has reached 80%~85% of the melting point of the Ni-based superalloys. In order to meet the service conditions of high temperature strength and room temperature plasticity of spacecraft in the temperature range of 1200 1400 ℃, new super high temperature alloy materials with refractory metal matrix are still being developed in China.

Tungsten carbide ceramics are widely used in aerospace, machinery industry, electronic power, armor, chemical industry and other fields because of their excellent performance in strength, wear resistance and corrosion resistance. Among the various properties mentioned above, the hardness of tungsten carbide is still insufficient compared with the other properties. Therefore, how to improve the hardness of tungsten carbide so as to achieve a balanced performance in all aspects, so that it is more suitable for various fields.

The addition of lanthanum to pure molybdenum not only improves the strength and toughness of molybdenum, but also increases the recrystallization temperature of molybdenum and improves its high temperature resistance. Therefore, lanthanum-doped molybdenum alloys are used to replace pure molybdenum in the preparation of electric heating materials, wire cutting electrode materials, electric light sources and other industries.

Epoxides are a kind of fine chemical raw materials and pharmaceutical intermediates with wide applications. The most important way to form epoxides is the epoxidation of olefins. Epoxidation plays an important role in both organic synthesis and chemical industry. Therefore, the study of olefin epoxidation has always been a hot spot in chemical industry.