In the field of industrial production, metal wear is one of the main causes of failure of mechanical parts, such as material conveying systems in metallurgy, coal, power, waterway dredging and other industries, parts wear very seriously. Wear not only causes great loss of materials, but also causes the shutdown of production and affects the normal operation of production line. Therefore, the research and development of high wear resistant materials has been paid attention by material workers.

Heteropoly acids are metal oxygen clusters formed by bridging metal atoms with oxygen atoms. Heteropoly acid has good catalytic performance and is an efficient bifunctional catalyst. It has not only acid catalytic performance, but also redox catalytic performance. Heteropoly acid has stable structure and can be used in homogeneous or heterogeneous catalytic environment. It can also be used together with phase transfer catalyst. It has no pollution to the environment and little corrosiveness to equipment. It is a promising green catalyst.

The thin tungsten sheet used for X-ray shielding material of CT machine is a high precision material with thickness of 0.1-0.2 mm and dimension tolerance of <0.01 mm. At present, the thickness tolerance of ultra-thin and high-precision tungsten sheet used for the collimator shade plate, the core component of CT machine, must reach (+5%) in order to ensure the stability of X-ray signals detected and obtain high-resolution images. How to make the tungsten sheet deform uniformly in hot working, and the surface is easy to handle, without causing surface indentation is the core issue to ensure tolerance. The choice of lubricating materials and methods is very important.

Nickel tungsten oxide has been proved to be able to be used as an anode or ion storage layer in electrochromic devices. Nickel exists in nickel-tungsten oxide thin films in the form of positive bivalent and positive trivalent. Increasing the content of positive trivalent nickel ion is beneficial to improving the discoloration range and ion storage capacity of the thin films, thereby improving the performance of electrochromic devices.