What is the difference between high-temperature ceramics and low-temperature ceramics?

High-temperature ceramic It is widely used in mechanical equipment due to its high temperature resistance, so High-temperature ceramic What are they?

Alumina ceramic

Alumina ceramic (artificial corundum) is a very promising high-temperature structural material. Its melting point is very high, and it can be used to make high-temperature crucibles, refractory furnace tubes, and special wear-resistant materials, etc.

Silicon carbide ceramic

SiC ceramics not only have excellent room temperature mechanical properties, such as high bending strength, excellent oxidation resistance, good corrosion resistance, high wear resistance, and low friction coefficient, but also the high-temperature mechanical properties (strength, creep resistance, etc.) are the best among known ceramic materials. It does not react with other inorganic acids, has strong corrosion resistance, can also resist oxidation at high temperatures, and it can also resist cold and hot shocks. Even if it is heated to more than 1000 in the air and then rapidly cooled and rapidly heated, it will not break. People often use it to manufacture bearings, turbine blades, mechanical seals, permanent molds and other mechanical components.

Boron carbide ceramic

Boron carbide ceramic materials have the characteristics of light weight, high hardness, high wear resistance, high impact resistance, neutron absorption, etc. Boron carbide also has high acid resistance and alkali resistance. It can resist air corrosion at 1000℃, but at higher temperatures, it is easily oxidized in an oxidizing atmosphere. Boron carbide has broad application prospects in high-tech industries, nuclear power technology, national defense and military industries, etc., and is an important strategic material in national economic construction and national defense construction, with a wide range of uses.

High-temperature porcelain is porcelain fired at over 1300 degrees. The higher the temperature, the greater the crystal density of the glaze, the higher the surface strength of the porcelain, the less likely it is to produce scratches, the tableware does not stick to oil and does not require detergent when cleaning, the tea set does not stick to tea stains, and the color is "white", without yellowishness, with the beauty of "white as jade". Low-temperature porcelain, however, is not delicate enough and the color is not white enough.

High-temperature ceramic It can also be fired and processed at high temperatures again; however, low-temperature porcelain cannot withstand high-temperature firing.

The sound can be used for simple distinction, High-temperature ceramic The degree of porcelainization is good, and the sound is crisp. But the fundamental thing is still to look at the size of the water absorption rate. The water absorption rate of high-temperature sintered ceramics is low.

Water absorption rate test method:

1. Use a special instrument to measure (vacuum water immersion).

2. Boil in boiling water for 2 hours.

3. Soak in clean water for 24 hours.

Regardless of the measurement method, the porcelain piece is first weighed to obtain m0, and the weight is obtained after the experiment to obtain m1. The water absorption rate is (m1-m0)/m0

The data obtained by each measurement method is slightly different, but as long as the two porcelain pieces are measured using the same method, the results are comparable. High-temperature ceramic The most obvious difference from medium and low temperature ceramics is the water absorption rate, High-temperature ceramic The water absorption rate is below 0.2%, the product is easy to clean, will not absorb odors, and will not cause glaze cracking or local leakage. The water absorption rate of medium and low temperature ceramics is much higher than this standard, and it is easy to get sewage, difficult to clean, and will emit unpleasant odors. After a long time, cracking and leakage will occur