Alumina95%

95% alumina ceramic is a high-performance ceramic material characterized by a 95% aluminum oxide (Al2O3) content. It exhibits high strength, hardness, corrosion resistance, high temperature resistance, and excellent electrical insulation properties.

95% alumina ceramic (Al₂O₃) is a widely used engineering ceramic material, belonging to the common alumina ceramic family.

Basic Characteristics:

• The alumina content is 95%, with the remaining 5% being additives (TiO₂, CaO, SiO₂, etc.).
• Sintering temperature is approximately 1600-1650°C, resulting in a dense microstructure.
• Main component: Al₂O₃ (95%)
• Additives: Approximately 5% TiO₂, CaO, SiO₂, etc. (used to lower the sintering temperature).
• Impurity content: Higher than 99% alumina, but with a better price-performance ratio.
• It offers an excellent balance of overall properties and is the most widely used type of alumina ceramic.

95% alumina ceramic (Al₂O₃) is a high-performance engineering ceramic material widely used in industry for its excellent mechanical properties.

Basic Performance Parameters of 95% Alumina Ceramics

Categories	Indicators	Unit	Typical Values
Physical Properties	Alumina content	%	95
	Color	-	White
	Density	g/cm³	3.75
	Water Absorption	%	0
Mechanical Properties	Flexural Strength	MPa	300 - 350
	Compressive Strength	MPa	2000 - 2500
	Vickers Hardness	HV0.5	1400 - 1500
	Fracture Toughness	MPa·m¹/²	3.5 - 4.0
	Elastic Modulus	GPa	300 - 320
	Poisson's Ratio	-	0.21 - 0.22
Thermal Performance	Maximum Operating Temperature	°C (In Air)	1500 - 1600
	Thermal Conductivity	W/(m·K) @ 20°C	20 - 25
	Linear Expansion Coefficient	×10⁻⁶/°C (20-500°C)	7.0 - 7.5
	Specific Heat	J/(g·K) @ 20°C	0.78 - 0.80
	Thermal Shock Resistance ΔT	°C	~200
Electrical properties	Volume Resistivity	Ω·cm @ 20°C	>10¹⁴
		Ω·cm @ 500°C	~10⁸
	Dielectric Strength	kV/mm	15 - 20
	Dielectric Constant εᵣ	@ 1 MHz, 20°C	9.0 - 9.5
	Dielectric Loss Tangent tanδ	@ 1 MHz, 20°C	(2 - 4) ×10⁻⁴

95% alumina ceramic strikes an excellent balance between cost and performance. Its advantages include:

• Excellent mechanical strength: High hardness and excellent wear resistance, sufficient to withstand most industrial wear scenarios.
• Excellent electrical insulation: High resistivity and high dielectric strength make it a reliable insulating material. Moderate thermal conductivity: It can meet certain heat dissipation requirements and also serve as a thermal insulator.
• Excellent corrosion resistance: It is resistant to high temperatures and oxidation, and is resistant to attack by most acids, alkalis, and organic solvents (except hydrofluoric acid and hot concentrated alkali).
• Highest cost-performance: Its performance far exceeds that of ordinary industrial porcelain, while its cost is significantly lower than 99% alumina, offering the best balance of affordability and functionality.

95% alumina ceramic is the most widely used and cost-effective advanced ceramic material in the industrial field.

Main application areas and specific components include:

1. Electronics and Electrical Industry - Insulation and Encapsulation Materials
This is the largest application market for 95% alumina, leveraging its excellent insulation and moderate thermal conductivity.

• Circuit substrates: thick-film hybrid integrated circuit (HIC) substrates and electronic component carriers.
• Insulation components: high-voltage insulators, switch housings, vacuum feedthroughs, and coil bobbins. 
• Package tubes and shells: Provide protective housings for semiconductor chips and sensors, achieving airtight packaging.
• Spark plug insulators: Withstand high temperatures and high pressures to ensure reliable ignition.

2. Mechanical and wear-resistant applications - As wear-resistant structural components
Leveraging its high hardness and wear resistance, it replaces metal and extends equipment life.

• Seal rings & bushings: Wear-resistant components in chemical pumps and mechanical sealing systems, offering corrosion resistance and long service life.
• Valve components: Valve cores and seats for ball and gate valves, resistant to abrasive and corrosive media.
• Wear-resistant liners & bushings: Linings for silos, chutes, fan blades, and mechanical equipment, protecting metal bodies.
• Sandblasting & shot blasting nozzles: Guide abrasives, offering far greater wear resistance than metal nozzles.
• Textile ceramic components: Yarn guides, eyelets, and needle latches, offering smooth, wear-resistant properties that do not damage yarn.

3. Chemical and medical applications - As a corrosion-resistant and bioinert material
Leveraging its corrosion resistance, non-toxicity, and biocompatibility. 

• Chemical pump linings and impellers: Key components for conveying corrosive and abrasive slurries.
• Laboratory equipment: Crucibles, mortars, and combustion boats, resistant to high temperatures, chemicals, and easy to clean.
• Medical device accessories: Wear-resistant components for artificial joints (although not as commonly used as zirconia), insulation and support components in medical equipment.

4. High-temperature industry and metallurgy - As a refractory and heat-resistant material

Utilizing its high-temperature resistance (long-term operating temperatures can reach over 1500°C).

• Furnace tubes and furnace chambers: Furnace tubes for high-temperature furnaces and the inner chambers of muffle furnaces.
• Thermocouple protection tubes: Protect thermocouple wires from high temperatures and corrosive environments.
• Setters and refractory supports: Support products during the sintering of electronic components and ceramics, ensuring a smooth and non-deformed finish.
• Glass and metal smelting: High-temperature resistant components such as launders, crucibles, and pouring nozzles.

5. Other industrial sectors

• Laser components: Discharge tubes and housings for low-power laser tubes. 
• Vacuum equipment: Insulation and fixtures within vacuum chambers, with low outgassing rates.
• Lighting industry: Tubes and arc tubes for metal halide and high-pressure sodium lamps, offering high-temperature resistance and sodium vapor corrosion resistance.