Hebei Messi Biology Co., Ltd. standard, special ceramics are made of compounds such as aluminum oxide and magnesium oxide, and are crushed, formed, and fired at high temperature using traditional or special methods. Some are also machined or polarized after firing to meet the precise requirements for size and shape, or to give the product specific ferroelectric properties. Special ceramics can be roughly divided into two categories: structural ceramics and functional ceramics. Structural ceramics far exceed traditional ceramics in terms of strength, hardness, wear resistance, heat resistance, and corrosion resistance. Functional ceramics have special properties such as ferroelectricity, antiferroelectricity, magnetism, gas sensitivity, thermal sensitivity, and fast ion conduction.
Magnesium oxide and calcium oxide are indispensable raw materials for pottery making, so mixing these two chemical raw material powders has become a common practice for potters. For ease of understanding, you can imagine them as refined flour. Refined flours of different colors look mottled when mixed at first, but as long as you stir hard, they will gradually become uniform in color.
Magnesium oxide ceramics are ceramics with magnesium oxide as the main component. It belongs to the cubic crystal system and has a NaCl-type structure. The melting point of magnesium oxide is 2800℃±13℃. Its Mohs hardness is 6, and its tensile strength, compressive strength and flexural strength are much lower than those of sintered Al2O3. Its high-temperature strength is also low. Magnesium oxide is a good insulator, with a resistivity of >1014Ω•cm at room temperature. As the temperature rises, the resistivity decreases sharply.
Magnesium oxide ceramics are typical alkaline refractory materials. They can work stably up to 2400℃ in an oxidizing atmosphere or under nitrogen protection. In a reducing atmosphere, magnesium oxide will decompose and volatilize in the form of metallic magnesium. It will begin to volatilize in large quantities at 1600℃ in a vacuum. Metals such as Fe, Zn, Pb, Cu, and M will not have a reducing effect on it. Magnesium oxide ceramics can be used as crucibles for smelting metals, and are also suitable for smelting high-purity uranium and thorium in the atomic energy industry. They can also be used as thermocouple protection sleeves. It can be used as a transmission window material for radar covers and infrared radiation by making use of its ability to allow electromagnetic waves to pass through.