With the rapid development of global industrial technology, environmental pollution has become increasingly serious, which has caused immeasurable harm to people's health and life. Therefore, photocatalytic technology has developed rapidly in recent years. Semiconductor catalysts have attracted extensive attention of scientists for their advantages of simple preparation, low energy consumption and fast degradation.

Traditional cemented carbide is composed of hard WC phase and low melting point metal bonding phase. WC has high hardness, excellent oxidation resistance and corrosion resistance. The addition of metal bonding agent will inevitably weaken the hardness, wear resistance, oxidation resistance and corrosion resistance of the alloy. In addition, it is likely to make the alloy more stable. The decrease of wear resistance, especially the softening and oxidation of metal bond at high temperature, will make WC cemented carbide prone to over-rapid failure, which limits the application scope of WC cemented carbide.

Tungsten oxide is a very good catalyst and high temperature superconducting material. It is also used to make electrochromic windows, infrared switches, writing, reading and polishing optical equipment, gas sensitive, humidity sensitive and temperature sensitive components. Meanwhile, tungsten oxide nanowires have excellent field emission properties and can be used as structural precursors for WS₂ nanotubes.

Tungsten wire is the raw material for making light source materials, high temperature heaters and high temperature resistant components. The traditional production method of tungsten wire is to prepare doped tungsten oxide by adding silicon, aluminium, potassium and other elements into tungsten oxide. The doped tungsten oxide is reduced twice or once by hydrogen at 500-950 ℃, and then doped tungsten powder is obtained by hydrochloric acid, hydrofluoric acid pickling (or not pickling). The doped tungsten powder is pressed by steel mould or isostatic pressing. The doped tungsten bars were obtained by vertical sintering after moulding, and the doped tungsten bars were manufactured by rotary forging and wire drawing.

With the continuous consumption of petroleum resources, the environment for oil exploitation is getting worse and worse, and the requirements for corrosion resistance and friction resistance of petroleum equipment are getting higher and higher. At present, the phenomenon of eccentric wear and corrosion is serious in the field of petroleum machinery. No satisfactory surface treatment technology can be applied to the surface treatment of petroleum machinery, which can simultaneously possess anti-corrosion, wear resistance and low cost.

In recent years, lead-containing materials are being gradually eliminated due to their high pollution, high toxicity, low strength and low efficiency. It is hoped that high-energy polymer composites with good processability will be developed to expand the application of metal materials.

As a traditional material, nickel-tungsten alloy has attracted much attention because of its many superior properties and some potential applications. Tungsten-nickel alloy electroplating has compact structure, high heat resistance, comparable to ceramics, wear resistance and oxidation resistance at high temperature, and good self-lubrication and corrosion resistance.

Bismuth tungstate nanometer is a kind of photocatalytic material with high efficiency, low toxicity and good stability. It is a typical Olivis oxide with perovskite-like WO₆ layer structure and narrow band gap (only about 2.80 eV). It can effectively remove organic pollutants in water by visible light photocatalysis. In the treatment of water pollution, Bi₂WO₆ nanometer is a typical perovskite-like oxide. It has important application value.

Bismuth tungstate is the simplest orivis oxide with narrow band gap (about 2.7eV) and can absorb part of visible light. This material has been used for photocatalytic degradation of organic pollutants, photocatalytic organic reaction and photocatalytic decomposition of water.

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