A Simple Understanding of Alumina Ceramics

2024-05-07 10:46:13

A Simple Understanding of Alumina Ceramics
Alumina ceramics are the most common advanced precision ceramic materials, and are also relatively traditional materials. As an excellent ceramic material, high-purity alumina ceramics have been widely used in many industries. This material has excellent performance in electrical insulation, high thermal conductivity, high chemical resistance, good wear resistance, and low thermal expansion.

Alumina ceramics can be divided into several application levels according to their alumina content, of which 99% is used to make high-temperature crucibles, refractory furnace tubes, and special wear-resistant materials, such as ceramic bearings, ceramic seals, and water valve parts; 95% – 96% alumina ceramics are mainly used as corrosion-resistant and wear-resistant components and circuit boards.

Properties of alumina:
Excellent electrical insulation (1×1014~1×1015Ωcm);
Medium to ultra-high mechanical strength (300 to 630 MPa);
Extremely high compressive strength (2000 to 4000 MPa);
High hardness (15 to 19 GPA index);
Medium thermal conductivity (20 to 30 with MK);
High corrosion resistance and wear resistance;
Good grinding performance;
Low density (3.75 to 3.95 g/cm3);
Working temperature without mechanical load is 1000 to 1500 °C;
Bioinertia, food compatibility.

Overview of the difference between alumina ceramic rod and zirconia ceramic rod
Ceramic rod, also known as ceramic rod, is mainly made of zirconia ceramic and alumina ceramic as raw materials and calcined. The market demand for ceramic rods is very large, and has been widely used in national defense, aviation and aerospace, industrial production, and other industries. The demand for ceramic rods varies from field to field. The main issues to be considered are: wear resistance, fire resistance, high temperature resistance, corrosion resistance, and wettability of ceramic rods.

Ceramic rods are mostly ivory white, and the commonly used colors are dark blue ceramic rods, light yellow ceramic rods, gray-black ceramic rods, etc.

Zirconium oxide ceramic rods:
Zirconium oxide ceramic rods have good wear resistance, high hardness, strong compressive resistance, The density exceeds 6.0. The main advantage of zirconia ceramic rods is good ductility! Zirconia ceramic rods are widely used in industries such as motor shafts, motor shafts, grinding, pin gauges, especially in the heat dissipation commodity industry, instead of traditional stainless steel center rods.

Alumina ceramic rods:
Alumina ceramic rods can withstand high temperatures up to about 1700 degrees Celsius, and have good electrical conductivity, impact toughness, and high temperature resistance. Alumina ceramic rods have low density and are easy to transport, but their ductility is poor and they are easy to crack and crush; Alumina ceramic rods are widely used and have penetrated into various fields such as electronics and electrical, mechanical equipment manufacturing, etc.


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