The difference between alumina ceramics and corundum

Release time：2024-09-11click：0

1. Alumina ceramics:

Alumina ceramic is a ceramic material based on aluminum oxide (Al2O3) and is used in thick film integrated circuits. Alumina ceramics have good conductivity, mechanical strength and high temperature resistance. It should be noted that ultrasonic cleaning is required. Alumina ceramic is a widely used ceramic. Because of its superior properties, its application in modern society has become more and more extensive, meeting the needs of daily use and special properties.

High-purity alumina ceramics are ceramic materials with an Al2O3 content of more than 99.9%. Since their sintering temperature is as high as 1650-1990℃ and the transmission wavelength is 1-6μm, they are generally Molten glass can be made to replace platinum crucibles; its light transmittance and resistance to alkali metal corrosion can be used as sodium lamp tubes; it can be used as integrated circuit substrates and high-frequency insulating materials in the electronics industry.

Ordinary alumina ceramics are divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain and other varieties according to the Al2O3 content. Sometimes the Al2O3 content is 80% or 75%. Classified as ordinary alumina ceramic series. Among them, 99 alumina porcelain is used to make high-temperature crucibles, refractory furnace tubes and special wear-resistant materials, such as ceramic bearings, ceramic seals and water valves; 95 alumina porcelain is mainly used for corrosion-resistant and wear-resistant parts; 85 porcelain Because some talc is often incorporated into it, the electrical properties and mechanical strength are improved. It can be sealed with molybdenum, niobium, tantalum and other metals, and some are used as electronic vacuum device components.

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2. Corundum:

Corundum, whose name originated from India, is a mineralogy name. There are three main variants of corundum Al2O3 isomorphism, namely α-Al2O3, β-Al2O3, and γ-Al2O3. The hardness of corundum is second only to Diamond. Corundum is mainly used in high-grade abrasive materials, ceramic bearing materials for watches and precision ceramic machinery. Ruby and sapphire are both corundum minerals that are used as laser emitting materials. They are only translucent and colorful except for the starlight effect. Only bright-colored corundum can be used as gemstones, while corundum of other hues is commercially referred to as sapphire.

The name Corundum originates from India and is a mineralogy name. In gemology, those with gemstone qualifications are called Ruby and Sapphire. Myanmar, Sri Lanka, Thailand, Vietnam, and Cambodia are the most important suppliers of high-quality rubies and sapphires in the world. Other producing countries include China, Australia, the United States, Tanzania, etc.

Corundum is a gemstone formed from the crystallization of aluminum oxide (Al2O3). Corundum mixed with metallic chromium is bright red in color and is generally called ruby; while blue or colorless corundum is generally classified as sapphire.

Corundum ranks 9th on the Mohs hardness scale. The specific gravity is 4.00 and it has a hexagonal prism lattice structure. With the hardness of corundum and its relatively lower price than diamond, it has become a good material for sandpaper and grinding tools.

Corundum has a glass luster and a hardness of 9. Specific gravity 3.95-4.10. It is formed under conditions of high temperature, rich in aluminum and poor in silicon, and is mainly related to magmatism, contact metamorphism and regional metamorphism.

Corundum is an artificial material made from bauxite as the main raw material through mining furnaces. It can be used as abrasives and refractory materials. The one with higher purity is white called white corundum, and the one with a small amount of impurities is called brown.It's called brown corundum.

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