In the diagnosis of kidney disease, it is necessary to detect ammonia gas by breath analysis. Now the ammonia gas sensor used in human exhaled gas analysis and detection technology needs to face the complex environment of low gas concentration, many kinds of interfering gases, high concentration and high humidity. This requires that ammonia gas sensor has high sensitivity and small size. Due to the characteristics of cheapness, cheapness and on-line measurement, the sensitive materials used in ammonia gas sensor also need to have the characteristics of high sensitivity, high selectivity, high stability, simple preparation and low cost.

Metallization modification of the welded surface of alumina composite single crystal is the precondition of reliable sealing with metal. Conventional molybdenum-manganese metallization process, sintering temperature is generally about 1400 ℃, later welding or use process exceed this temperature, the glass phase in the metallized layer will flow, destroy the metallized layer, thereby affecting the sealing strength and sealing gas tightness of ceramics-metal and other properties. Moreover, the low metallization sintering temperature also limits the selection of high temperature quinone solder for sealing alumina composite single crystal with metal, and directly limits the high temperature use of sealing parts.

Vehicles in high temperature and high speed must be fully lubricated between moving parts to ensure normal operation. Lubrication system plays an important role in lubrication, cleaning, cooling and rust prevention of engine friction surfaces.

In the field of semiconductor gas sensitive materials, tungsten oxide (WO₃) has become the research focus of nano gas sensitive materials in recent years because of its easy regulation, strong selectivity, good stability, high sensitivity and low gas sensitive working temperature.

In the field of powder metallurgy manufacturing technology, grinding needles made of powder cemented carbide are widely used in mechanical drilling and dressing of jades, mechanical drilling of printed circuit boards, etc. Tungsten carbide grinding needle is a kind of cemented carbide grinding needle. Its structure is characterized by solid grinding needle, small diameter, long length, small tolerance range of length and size and high requirement of verticality.

Photocatalytic reactions can degrade almost all organic contaminants such as alkanes, halogenated alkanes, alcohols, carboxylic acids, alkenes, aromatic hydrocarbons, halogenated aromatic compounds, polymers, insecticides, herbicides, dyes and brominated flame retardants. Contaminants such as disinfection by-products. Therefore, photocatalysis technology is considered to be an ideal new technology for environmental management and a most promising means of controlling environmental pollution.

Hydrogen reacts with oxygen to form water, which does not pollute the environment. It is a clean energy and can also be used in chemical production processes such as ammonia synthesis. Electrochemical catalytic is a major method of hydrogen production. However, precious metal materials represented by platinum-based metals are expensive and have a small amount of resource storage, which limits the development of electrocatalytic hydrogen production.

In the field of inorganic semiconductor materials, cadmium sulfide is a typical semiconductor. The CdS photocatalyst has a band gap of 2.4 eV at room temperature, and the conduction band potential (-0.87 eV) and valence band potential (1.5 eV) can meet the conditions of complete photolysis of water. . Therefore, cadmium sulfide can improve the utilization of sunlight and become one of the most attractive semiconductor catalysts in sulfide systems.

Tungsten oxide is an n-type semiconductor and is a typical transition metal oxide. As a functional material, it is applied to industrial catalysts, electrochromic, battery electrodes, solar energy absorbing materials, invisible materials, gas sensing materials, and the like. Especially in the field of oxide semiconductor gas sensor applications, tungsten oxide-based materials have been considered as one of the most promising new oxide gas sensing materials for detecting NOx, SOx, NH3 and H2S.

Infrared light, especially near-infrared, has a significant thermal effect, which tends to cause temperature rise, which causes an increase in temperature, such as indoors or in a car. The currently disclosed infrared barrier materials generally refer to a class of functional materials that have a strong absorption or reflection of infrared light without affecting the transmission of visible light.