With the application of cemented carbides becoming more and more extensive, and the performance requirements tend to be a combination of high strength, high hardness and high temperature resistance. Some enterprises have adopted a new preparation process to prepare tungsten carbide ceramic cemented carbide. The process is as follows:

At present, zirconium tungstate is the most widely studied negative thermal expansion material. AM₂O₈ series represented by ZrW₂O₈ has better negative thermal expansion performance and wider temperature range. In the existing academic papers, some scholars have introduced a process of preparing zirconium tungstate by multiple sintering solid-state method. Although this method can obtain single-phase zirconium tungstate products, it requires multiple sintering in the preparation process, and each sintering process parameters are changeable, the process is cumbersome and the conditions are not easy to control, and the requirements are too high.

Spray drying is a drying method that produces a powder drying product by processing a solution, emulsion, suspension and slurry material in a single process. The main advantages of this method are fast drying rate, short drying time and low material temperature. Its characteristics are that liquid raw materials can directly form powdered products, can be continuously produced in large quantities, without crushing process can directly get products with uniform particle size, excellent solubility and dispersion.

Dicyclopentadiene dioxide is a kind of alicyclic epoxide with excellent properties. It has excellent weatherability, heat resistance, high hardness and good electrical insulation. It is used in high temperature casting materials, glass fibre reinforced plastics, adhesives, laminates and packaging of electronic devices. This material is usually prepared by epoxidation of dicyclopentadiene, and strong acid catalyst is needed in the reaction process.

W60 tungsten copper bar is composed of 60% W and 40% Cu, which not only has high density (12.75g/cm3), high hardness (≥HB140), high strength, but also has good conductivity (%47IACS), softening temperature is ≥900℃.

W50 tungsten copper bar is composed of 55% W and 45% Cu, which not only has high density (11.85g/cm3), high hardness (≥HB115), high strength, but also has good conductivity (%54IACS), softening temperature is ≥900℃.

W50 tungsten copper bar is composed of 50% W and 50% Cu, which not only has high density (11.85g/cm3), high hardness (≥HB115), high strength, but also has good conductivity (%54IACS), softening temperature is ≥900℃.

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It has been found that modification is the most effective way to improve the photocatalytic activity of tungsten trioxide. Common modification materials are gold, silver, platinum, iron, copper, zinc, bismuth, titanium and so on. A kind of zinc modified tungsten trioxide thin film photocathode material is introduced in this paper.

Among skarn tungsten deposits, wolframite and scheelite are the most common phenomena, and scheelite also coexists with calcareous gangue minerals such as fluorite, calcite, apatite and garnet. The flotability of scheelite and fluorite gangue minerals is similar, so the flotation separation of scheelite and fluorite is always a technical problem.