China used clay with less impurities more than 4,000 years ago, burned pottery, and was able to cast bronze. In the Eastern Han Dynasty (25-220 AD), clay refractories were used to make kiln and enamel for burning porcelain. At the beginning of the 20th century, refractory materials were developed in the direction of high-purity, high-density and ultra-high-temperature products. At the same time, unshaped refractories and high refractory fibers that did not require firing and low energy consumption were developed (for industrial furnaces above 1600 °C). ). The former, such as alumina refractory concrete, is commonly used in the inner wall of a two-stage reformer of a large-scale chemical plant ammonia production plant, and the effect is good. Since the 1950s, the rapid development of atomic energy technology, space technology, and new energy development technologies requires the use of special refractory materials with high performance, such as high temperature resistance, corrosion resistance, thermal shock resistance, and erosion resistance, such as melting point higher than 2000 °C. Oxides, refractory compounds and high temperature composite refractories. Linear Bearings,Linear Ball Bearing,Linear Bearing Shaft,Linear Motion Bearing Dongyang City Shuangchi Bearing Co.,Ltd , https://www.zjscbearing.com
Refractory development