Silver-nickel contacts are widely used in various low-voltage electrical appliances due to their good thermal conductivity, low and stable contact resistance, and excellent processing properties. However, due to the weak anti-welding performance, the applications of silver-nickel contacts are limited.

At present, China's major cities are booming in the construction of rail transit projects. Due to the great advantages, the shield tunneling method has been widely used in the construction of rail transit tunnels.

In the 21st century, energy and environmental pollution have become a worldwide problem. The development and application of new energy sources is imminent. Lithium-ion batteries have advantages such as high operating voltage and high specific energy, and have been applied to portable electronic products such as laptops, mobile phones and digital cameras. In recent years, the rapid development of full electric vehicles and hybrid electric vehicles has provided a huge market prospect and high-speed development for lithium-ion batteries. It also poses new challenges for performance improvement and cost reduction of lithium-ion batteries.

Tungsten disulfide (WS2) is a hard\dry lubricant with characteristics similar to graphite. It has excellent high temperature resistance and extreme pressure resistance. It has good attach to metal surfaces and low thermal conductivity. WS2 was first applied to the lubrication of key parts of the Mariner project’s spacecraft. What’s more, it was used to prepare high temperature resistant grease and engine oil.