Alumina Ceramic: Exceptional High-Temperature, High-Strength Insulating Material

Alumina Ceramic: Exceptional High-Temperature, High-Strength Insulating Material

Introduction
Alumina ceramic (Al₂O₃) is an advanced industrial ceramic material primarily composed of α-alumina as the main crystalline phase. Due to its unique physical and chemical properties, it holds an irreplaceable position in modern industry and high-tech applications. Produced from high-purity raw materials and advanced sintering techniques, alumina ceramic exhibits outstanding high-temperature stability, excellent mechanical strength, and superior electrical insulation properties, making it widely applicable in various demanding environments.

Applications
Alumina ceramic has an extensive range of applications, including:

• Electronics and Electrical Industry: Integrated circuit substrates, electronic packaging shells, high-voltage insulating insulators, spark plugs, vacuum circuit breaker components.

• Mechanical Industry: Wear-resistant ceramic parts (e.g., sealing rings, bearings, ball valves), cutting tools, textile ceramic components.

• High-Temperature Industry: High-temperature furnace tubes, thermocouple protection tubes, crucibles, refractory bricks, glass melting furnace linings.

• Medical Field: Artificial joints, dental implants, surgical instrument parts.

• Other Fields: Laser tubes, wear-resistant pipeline linings, armor protection materials.

Advantages

1. High Hardness and Strength: Mohs hardness of up to 9, second only to diamond, with excellent wear resistance and high mechanical strength.

2. Exceptional High-Temperature Performance: Can operate long-term at temperatures up to 1600°C or higher without deformation, offering excellent thermal stability.

3. Superior Electrical Insulation: High resistivity and low dielectric loss make it an ideal insulating material, especially for high-frequency and high-voltage environments.

4. Good Corrosion Resistance: Highly resistant to most acids, alkalis, and solvents, ensuring excellent chemical stability.

5. Cost-Effectiveness: Among advanced ceramics, alumina ceramic is cost-effective due to widely available raw materials and mature manufacturing processes.

Specification Parameters Table

Manufacturing Process
The production of alumina ceramic primarily follows these steps:

1. Powder Preparation: High-purity alumina powder is selected, and sintering aids are added according to the formula.

2. Forming: The powder is shaped into green bodies using methods such as dry pressing, isostatic pressing, slip casting, tape casting, or injection molding.

3. Sintering: Densification is achieved in high-temperature sintering furnaces at temperatures ranging from 1600°C to 1800°C to produce the final high-performance ceramic product.

4. Precision Machining: Depending on accuracy requirements, sintered ceramic components undergo grinding, polishing, laser cutting, or other precision machining processes.

Usage Instructions

• Installation and Operation: Avoid direct impact with metal hammers; use nylon or rubber hammers for installation. Prevent localized stress concentration.

• Temperature Control: Although resistant to high temperatures, avoid rapid temperature changes to prevent thermal stress-induced cracking.

• Cleaning: Clean using ultrasonic methods or wipe with neutral detergents. Avoid strong corrosive chemicals such as hydrofluoric acid.

After-Sales Service
We provide comprehensive technical support and after-sales services, including product technical consultations, usage guidance, and return or replacement services for non-human-caused quality issues (specific terms subject to the purchase agreement). We are committed to promptly addressing and resolving customer feedback.

FAQ

1. Q: Which is more wear-resistant, alumina ceramic or zirconia ceramic?
   A: Alumina ceramic has higher hardness and better wear resistance, while zirconia ceramic offers greater toughness and impact resistance. The choice depends on the specific application.

2. Q: What level of precision can be achieved with alumina ceramic machining?
   A: Through precision grinding and polishing, dimensional accuracy can be controlled within ±0.001mm, and surface roughness can reach Ra0.01μm.

3. Q: Can it be directly welded to metal?
   A: No, direct welding is not possible. Reliable bonding with metal is typically achieved through brazing, glass sealing, or using epoxy adhesives.

4. Q: Is higher alumina content always better?
   A: Not necessarily. Higher purity (e.g., 99.5%) ceramics offer better electrical and high-temperature performance but are more expensive and slightly less tough. 96% alumina ceramic strikes a balance between mechanical strength and cost, making it a common industrial-grade choice.

We are a company with many years of experience in the production of special precision ceramics and the ability to design, manufacture, process and sell structural and functional parts of various special precision ceramics.

Deyu Precision Ceramics Technology Co., Ltd. has many years of experience in producing special precision ceramics, and has the ability to design, manufacture, process and sell structural and functional parts of various special precision ceramics. At present, the company has production and processing equipment such as dry press, isostatic press, experimental furnace, flat kiln, machining center, surface grinder, universal internal and external grinder, centerless grinder and laser cutting machine, as well as complete high-precision testing equipment such as high-precision projector, three-dimensional tester, metallographic microscope, hardness tester and densitometer.

With advanced production technology and complete production facilities, the company is one of the few domestic enterprises that can produce special precision ceramic structural parts and functional parts with machining accuracy less than 2 microns, and has strong core competitiveness in the same industry in China.

Advantages of the company: 1. National new technology enterprises; 2. The company has a municipal R&D center; 3. Cooperation with domestic key universities and research institutes; 4. Design, molding, sintering and precision processing; 5. The products cover alumina, zirconia, silicon nitride, silicon carbide and other precision ceramics; 6. Precision plus technology.

The company has always been standing in the position of customers to solve problems, focusing on the principle of quality and delivery time, adhering to the business philosophy of "integrity, innovation and reassurance", and sincerely looking forward to cooperating with you.