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Alumina Al2O3 Ceramic

In the industrial world, equipment downtime is the biggest cost killer. Alumina Ceramic exists to solve this problem. As an engineering material that strikes a perfect balance between hardness, heat resistance, and insulation, it can extend the lifespan of your mechanical parts by 5 to 10 times under extreme conditions.

Whether you need a seal ring resistant to slurry abrasion or an electronic substrate that remains insulating at high temperatures, Zhuhai Cersol Technology provides customized Alumina solutions (A96 - A999). We don’t sell "concepts"; we provide durable parts verified by lab data.

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Industrial High-Purity Alumina Ceramic Parts(Al₂O₃)

What is Alumina Ceramic?

Alumina (Al₂O₃) is the "versatile workhorse" of industrial ceramics. It is not fragile porcelain but a dense inorganic non-metallic material formed through high-temperature sintering.

Appearance: Depending on purity, it appears White (A96/A999) or Off-white (A997).

Key Characteristic: It offers zero water absorption (0%) across all our grades, ensuring stability in wet environments.

Technical Specifications

Selection should be based on facts, not guesses. The following data comes from our internal laboratory tests:

Property	Unit	A96	A997	A999
Color	-	White	Off-white	White
Density	g/cm³	> 3.86	> 3.90	> 3.95
Water Absorption	%	0	0	0
Grain Size (Average)	μm	5 - 8	4.47	5.87
Vickers Hardness	GPa	15	16	16.5
Flexural Strength	MPa	> 350	> 350	> 450
Young's Modulus	GPa	340	380	380
Poisson's Ratio	-	0.23	0.23	0.23
Thermal Conductivity	W/(m·K)	26	32	34
Thermal Shock (ΔT)	°C	200	200	250
Thermal Expansion Coeff.	10⁻⁶/°C	7	7.2	7.5
Specific Heat Capacity	J/(g·K)	0.7	0.77	0.78
Dielectric Breakdown	KV/mm	14	15	15
Volume Resistivity	Ω·cm	> 10¹⁴	> 10¹⁴	> 10¹⁵
Dielectric Constant (1MHz)	-	9.4	9.7	9.9
Dielectric Loss (1MHz)	×10⁻⁴	40	10.9	2.2

Source: Cersol Technical Data Sheet

Superior Mechanical Performance

Why is it the standard for wear resistance?

Hardness Beyond Steel: Even our entry-level A96 achieves a Vickers Hardness of 15 GPa. This means it can easily resist abrasion from sand, slurry, and metal friction.

High Strength Support: The A999 series offers a flexural strength greater than 450 MPa. Under high loads (such as ceramic plungers), it provides a higher safety margin against fracture.

Excellent Thermal Properties

In environments where plastics melt and metals soften, Alumina Ceramic stands firm.

Heat Dissipation:A999 features a thermal conductivity of 34 W/(m*K), making it an ideal choice for heat-dissipating substrates in power electronics.

Thermal Shock Resistance: While ceramics generally fear rapid temperature changes, our A999 can withstand a thermal shock of 250°C, reducing the risk of cracking during rapid heating or cooling.

Electrical Insulation Features

For manufacturers of high-voltage equipment, insulation reliability is a matter of safety.

Dielectric Strength: Our ceramics offer a breakdown voltage of 14 - 15 KV/mm.

Volume Resistivity: With volume resistivity exceeding 1014Ohm*cm (and up to 1015 for A999), current leakage is effectively prevented even in high-frequency environments.

Honest Limitation(Where Alumina Might Not Fit)

1.Low Fracture Toughness (Brittleness)

The Issue: Unlike metals, Alumina ceramic does not deform plastically under stress; it cracks. It has low resistance to impact loads. If your application involves heavy hammering or dropping, Alumina might shatter.

The Solution: Use Zirconia (ZrO₂) for high-impact areas, or design your Alumina parts with chamfered edges to reduce stress concentration.

2. Thermal Shock Limits

The Issue: While Alumina withstands high temperatures (up to 1700°C), it dislikes sudden temperature changes. A rapid change of more than 200°C-250°C (Thermal Shock) can cause thermal fractures.

The Solution: If you need to quench parts from red-hot to cold water instantly, Silicon Nitride (Si₃N₄) is a better choice.

3. Difficult Machinability

The Issue: Because it is harder than tungsten carbide, Alumina cannot be machined with standard HSS or carbide tools after sintering. It requires expensive diamond tooling, making complex modifications costly.

The Solution: Consult with Cersol engineers before sintering. We can perform "Green Machining" (shaping before firing) to significantly reduce costs.

Selection Guide (A96 vs A997 vs A999)

Choose A96: The Cost-Effective Choice. Ideal for general wear liners or pump seals. It offers excellent hardness (15 GPa) at a competitive price.

Choose A997: Standard Precision. With a specific average grain size of 4.47 um, it offers a great balance for structural parts requiring fine surface finishes.

Choose A999: Extreme Performance. It features the highest density (>3.95 g/cm3) and strength, designed for semiconductor equipment or vacuum environments where impurities must be minimized.

Frequently Asked Questions (FAQ)

Q: Does your ceramic absorb liquid?

A: No. The water absorption rate for all our grades (A96/A997/A999) is 0%. This ensures dimensional stability in chemical or wet environments.

Q: How tough is the material?

A: Alumina is very hard but rigid. Its Young's Modulus is between 340 and 380 GPa. While it resists wear exceptionally well, it should be installed carefully to avoid impact shocks.