Al2O3

Alumina Ceramic is a ceramic material primarily composed of aluminum oxide (Al2O3). It exhibits high thermal conductivity, excellent mechanical strength, and superior high-temperature resistance, making it a versatile ceramic material widely used across industries. Due to its outstanding performance, alumina ceramic has seen increasingly broad market applications, meeting demands for both common consumables and specialized performance requirements.

Material Characteristics

High hardness – With a Rockwell hardness of HRA 80-90, it is second only to diamond and far exceeds the wear resistance of wear-resistant steel and stainless steel.
Exceptional wear resistance – Its abrasion resistance is 266 times that of manganese steel and 171.5 times that of high-chromium cast iron.
Lightweight – With a density of 3.4–3.9 g/cm³, it is only half that of steel, significantly reducing equipment load.

Material Applications

1. Mechanical Applications

Alumina ceramics are used to manufacture cutting tools, ball valves, grinding wheels, ceramic nails, bearings, etc. Among these, alumina ceramic cutting tools and industrial valves are the most widely applied.
Example: Pure alumina ceramic cutting tools

2. Medical Applications

In the medical field, alumina is primarily used to produce artificial bones, joints, and teeth.
Advantages: Alumina ceramics exhibit excellent biocompatibility, bio-inertness, chemical stability, high hardness, and wear resistance, making them an ideal material for bone and joint replacements.

3. Chemical Industry Applications

Alumina ceramics are extensively used in chemical engineering, including:

Alumina ceramic packing balls (for reactors/distillation)
Inorganic microfiltration membranes
Corrosion-resistant coatings
Among these, alumina ceramic membranes and coatings are the most researched and applied.

4. Electronics & Electrical Applications

In electronics and electrical engineering, alumina ceramics are used for:

Substrates & circuit boards
Ceramic films & transparent ceramics
Insulating components, electronic materials, and magnetic materials
The most common applications are alumina transparent ceramics and substrates.

Material Data

Properties		Units	Alumina(Al₂O₃)
			Porous		Mullite	Al₂O₃ _85%	Al₂O₃ _92%	Al₂O₃ _96%	Al₂O₃ _99.5%	Al₂O₃ _99.8%
			Al2O3+ Mullite	Al₂O₃	Mullite	Al₂O₃ _85%	Al₂O₃ _92%	Al₂O₃ _96%	Al₂O₃ _99.5%	Al₂O₃ _99.8%
Mechanical	Density	g/cm³	2.0-2.5	3.0-3.5	2.8	3.4	3.6	3.7	3.9	3.92
	Color	—	—	—	Tan	White	White	White	Ivory/ White	Ivory
	Water Absorption	%			0	0	0	0	0	0
	Hardness	Gpa	—	—	7.4	9.5	11	11.5	14.1	14.0-15.0
	Flexural Strength (20°C)	Mpa	150-200	50-100	170	300	345	358	380	400
	Compressive Strength (20°C)	Mpa	30-100	20-100	550	1950	2200	2300	3000	3150
Thermal	Thermal Conductivity (20°C)	W/m°k	1.5	3.1	3.5	16.0	16.7	24.8	25-35	30
	Thermal Shock Resistance (20°C)	∆T(°C)	—	—	300	300	250	250	200	200
	Maximum Use Temperature	°C	1600	1900	1700	1400	1500	1600	1700	1700
Electrical	Volume Resistivity (20°C)	Ω-cm	>10¹³	—	>10¹⁴	>10¹⁴	>10¹⁴	>10¹⁴	>10¹⁴	>10¹⁴