Advantages of engineering ceramics

high strength

Engineering Ceramics have almost all the strengths of the modern ceramic family. Their strength is very high, especially for hot-pressed silicon nitride. The room temperature bending strength is generally in the range of 8000-10000 kg/cm2. If hot pressed silicon nitride with cerium oxide and aluminum oxide is added, the room temperature bending strength can reach 15000 kg/cm2, which makes the strength of ceramic materials exceed the 10,000 kg mark. This can be said in ceramic material. It is at the top of the list. It is also very hard and is one of the hardest substances in the world. It is extremely resistant to high temperatures and does not melt into a liquid after being heated, but does not decompose into silicon and nitrogen until 1900 °C. At the same time, the ability to withstand rapid heat and cold is also very good, they are suddenly heated from room temperature to a temperature higher than a thousand degrees, and then suddenly thrown into the water will not crack, for this reason, the most suitable for the manufacture of high-temperature gas turbine blades , high temperature and so on. Due to its high hardness, it is used as a tool for cutting metal. It does not soften or oxidize even in the case of rapid friction and high heat. Therefore, it is suitable for high-speed cutting and cutting of hard such as barrels and brake cylinders. Steel parts. It can do things that metal is not capable of, and it is widely used to make gas turbine turbine blades from silicon nitride ceramics. Because gas turbines are an advanced power machine, they are used in jet aircraft, thermal power stations, locomotives, and trucks.

Wear and corrosion resistance

Engineering ceramics also have excellent wear resistance and chemical resistance, and are good materials for making various corrosive parts. It is resistant to almost all inorganic acids (except hydrofluoric acid) and less than 30% caustic soda solution. It is also resistant to many organic substances. It is also resistant to the erosion of many molten non-ferrous metals, especially aluminum. The aluminum liquid does not wet the silicon nitride, so the structural parts that make it contact with the aluminum liquid will not be contaminated.

insulation

Silicon nitride ceramics are also a good electrical insulating material, and their electrical insulation properties can be compared with Alumina Ceramics. It also has microwave-transparent performance and can be used as a radome. Its dielectric properties vary little with temperature and can be used at least 550 ° C at high temperatures. Its thermal shock resistance is superior in all types of ceramics, which makes it possible to use at six Mach (ie six times the speed of sound) and even at seven Mach flight speeds.

Almighty

Engineering ceramics and its derivatives ceramics are high-strength, and alumina ceramics, which is known as the "king of ceramics", is not as good as it. No wonder people praise engineering ceramics (silicon nitride ceramics) as the "all-round champion" in the ceramic family.