Products Description

Alumina ceramics, also known as aluminum oxide (Al₂O₃) ceramics, are a class of high-performance materials prized for their exceptional properties. While alumina crucibles are a quintessential product, the versatility of this material extends far beyond, encompassing a vast array of custom alumina ceramic parts, alumina ceramic plates, alumina tubes, alumina blocks, alumina sheets, alumina discs, and alumina rods. From high purity alumina (99% and above) used in demanding applications to standard grades, alumina is a foundational ceramic material. Its composition, Al2O3, can be formed into diverse shapes like alumina wafers, alumina boats, alumina rings, and complex alumina ceramic components through processes such as alumina ceramic injection molding and pressing, followed by high-temperature sintering. Whether referred to as aluminum oxide ceramic, aluminiumoxid keramik, or ceramica de alumina, this material serves as an outstanding electrical insulator alumina and structural solution.

Alumina Crucible Ceramics

Product name	Alumina Crucible Ceramics
Material	(95%-99.99%)Alumina/Al2O3
Color	Customized according to the client's requirements
size	Customized according to the client's requirements
Machining accuracy	±0.001mm
Packaging	Carton /Pallet/Wooden case (According to client requirement )
Delivery time	Standard Product-Within 3 days
Items Design	According to the client's drawing or samples
Features	Good quality, low price, Multiple factories, deliver to you based on the one closest to your location
Application	Industrial Ceramics
Certificate	ISO, CE

Ceramics performance parameter

Number	Performance	Unit
			97 Porcelain	99 Porcelain	99 Porcelain	995 Porcelain	997 Porcelain	999 Porcelain
			Al2O3	Al2O3	Al2O3	Al2O3	Al2O3	Al2O3
1	Density	g/cm3	3.8~3.85	3.85	3.9	3.9	3.92	3.98
2	Flexural strength	MPa	320	340	450	370	400	550-600
3	Fracture toughness	MPa·m1/2	4.5	5.6-6	6.2	5.6-6	5.6-6	2.8-4.5
4	Dielectric constant	εr(20℃,1MHz)	9.2	9.5	9.5	9.7	9.8	9.9
5	Hardness	GPa	15	15-16			16.3	16.3-18
	Hardness	HRC	79	79-80			81	81-83
6	Volume resistivity	Ω·cm(20℃)	10 14	10 14	10 14	10 14	10 14	10 14
7	Elastic modulus	GPa	350	330	350	380	380	400
8	Coefficient of thermal expansion	×10-6/k	7.6	7.6	7.6	7.6	5.4-8.4	6.4-8.9
9	Compressive strength	MPa	2100	2210	2500	2300	2300	2300
10	Abrasions	g/cm2	0.1	0.1	0.1	0.1	0.1	0.1
11	Thermal conductivity	W/m×k(20℃)	24~27	34	38	35	35	38.9
12	Poisson's ratio	/	0.22	0.22	0.22	0.22	0.22	0.22
13	Insulation strength	kv/mm	28	28	28	28	30	30
14	Temperature	℃	1650	1650	1650	1650	1700	1700

Properties of Alumina Ceramic Material

The widespread use of alumina stems from its outstanding combination of physical and chemical traits, making it suitable for custom alumina parts ranging from ceramic bulletproof plates to alumina insulators.

Extreme Hardness & Wear Resistance: Alumina is exceptionally hard, providing superior abrasion resistance, which is crucial for parts like alumina ceramic nozzles, alumina linings, and alumina ceramic rods.
High-Temperature Resistance: With a maximum service temperature up to 1800°C for high-purity grades, it is ideal for alumina tubes for furnaces, alumina crucibles, and alumina boats.
Excellent Chemical Inertness: It exhibits remarkable resistance to corrosion from acids, alkalis, and molten metals (e.g., in a diy crucible for melting aluminum context), ensuring longevity in harsh environments.
High Mechanical Strength: It possesses excellent compressive strength and stiffness, which is essential for alumina blocks, alumina ceramic bars, and alumina plates under load.
Good Thermal Shock Resistance: While varying with purity, it can withstand rapid temperature changes, a key factor for alumina crucibles and alumina ceramic tubes.
High Electrical Insulation: Even at elevated temperatures, alumina is an excellent insulator, making alumina substrates, alumina ceramic insulators, and Al2O3 insulators vital in electronics.
Low Thermal Conductivity: This property provides effective thermal management in applications like ceramic cooling plates or carrier plates.

Product Application

The applications for alumina ceramic products are vast and cross-industrial, driving demand for both standard and custom alumina ceramic components.

Industrial Engineering: Used for alumina tubing, alumina nozzles, alumina liners, alumina ceramic spacers, alumina washers, and alumina bricks in high-wear, high-temperature environments.
Electronics & Semiconductor: Essential as alumina substrates, Al2O3 wafers, alumina ceramic sheets, alumina insulating plates, and custom semiconductor ceramic disks for circuitry and component carriers.
Laboratory & Metallurgy: The classic alumina crucible (including cylindrical alumina crucible with lid), along with alumina boats, alumina trays, and alumina mortar and pestles, are used for analysis, calcination, and melting metals.
Defense & Ballistics: High-grade alumina is a key material in ceramic armor plates, ceramic ballistic plates, and ceramic SAPI plates for personal and vehicle protection.
Medical & Precision: Utilized in alumina ceramic eyelets, alumina ceramic rods, and precision alumina rings due to its biocompatibility and wear resistance.
Research & Development: Forms the basis for prototypes and specialized equipment, including custom alumina ceramic crucibles, custom alumina ceramic tubes, and experimental setups requiring alumina-based ceramics.