Alumina ceramic products have high content of metal materials, compact structure and special properties, also known as special ceramics. High temperature/high pressure resistance, uniform heating, fast heat dissipation; Simple and compact structure, small volume, heat element acid and alkali corrosion resistance, durable; Comply with the European Union ROHS environmental standards.
Performance features:
1. The hardness
Measured by Shanghai institute of ceramics, Chinese Academy of Sciences, its rockwell hardness is hra80-90, the hardness is only second to diamond, far more than the wear resistance of wear resistant steel and stainless steel.
2. Excellent wear resistance
According to the measurement of powder metallurgy institute of zhongnan university of technology, its abrasion resistance is 266 times of manganese steel and 171.5 times of high chromium cast iron. According to our customer tracking survey for more than ten years, under the same working condition, the service life of the equipment can be extended at least ten times.
3. Light weight
Its density is 3.5g/cm3, only half of that of steel, which can greatly reduce the load of equipment.
4. Wide application scope
For coal conveying, material conveying system, pulverizing system, ash discharging, dust removal system and other wear and tear machinery and equipment of thermal power, iron and steel, smelting, machinery, coal, mining, chemical industry, cement, port and wharf enterprises, different types of products can be selected according to different needs.
Technical indicators:
Technical parameter: alumina
Content % ≥95 ≥99 ≥99.7
Density g/cm3
Hardness (Hv0.5) GPa 13.1 15.0 17.1
Flexural strength MPa≥ 340 310 370
Elastic modulus GPa 300 330 350
Poisson's ratio 0.23 0.23 0.23
Maximum service temperature ≥ 1400 1750 1800
Thermal expansion coefficient ×10-6/℃(40-800℃) 7.8 8.0 8.0
Heat conductivity W/m·K(20℃) 22 28 31
Thermal shock resistance (water) ℃ 200 200 230
Dielectric strength V/m 15×106 15×106 15×106
Dielectric loss Angle (1MHz) ×10-4, 4, 2, 1
Dielectric constant (1MHz) 9.2 9.8 9.9
Nitric acid (60%)90℃ WT Loss mg/cm2/day≤ 0.12 0.10 0.05
Caustic soda (30%)80℃ WT Loss mg/cm2/day≤ 0.53 0.26 0.04
Application of alumina heat-conducting porcelain:
Alumina thermal conductivity ceramics not only has a large insulation resistance, high hardness, and also has wear-resistant, corrosion resistance and high temperature resistance and other excellent performance, mainly not only in the electronic industry applications, but also in other industries such as textiles, petroleum, chemical, construction and electronics and other industries.
The main application of thermal conductivity ceramics is not selected in the following convenience:
1. When the product does not use alumina thermal conductivity ceramics, its measurement pipe waveform will change from normal to abnormal deformation state in a period of time after starting up.
2. If there is a phenomenon of exploding machine or burning pipe more than half an hour after starting up, the circuit shall be checked to find no abnormalities.
3, hand touch pipe very hot, and heat without heat.
4. After the product was sold, a long time later, the customer returned the tube burning machine.
5. Many devices have high requirements for thermal insulation.
6, the product has the above problem, can choose alumina thermal conductivity ceramics, because not only in the electronic industry applications, in other industries the role of alumina thermal conductivity ceramics is also very big.
Basic content:
1. Definition:
More than 95% of alumina wear-resistant ceramics formed by high temperature sintering micro-hardness 2200-2300, with resistance to abrasion, extremely high hardness, chemical stability, can withstand high purity, large material impact wear for a long time, is the ideal material for the inner lining of the cyclone.
Wear-resistant ceramics are special wear-resistant ceramics formed by dry pressing and roasted at 1500℃. Mohs hardness is 9, which is second only to diamond. The production of
Wear-resistant ceramic lining plate is a special wear-resistant ceramic formed by dry pressing and roasted at 1500℃. Its mohs hardness is 9, second only to diamond
2. Properties and features of lining and lining board:
Product 95%-99% alumina products
Material: 95%/99%/99.7% alumina product
Forming method: dry press/hot press
The color white
Packaging carton
The delivery time is within 3 days for conventional products and 15-20 days for newly developed samples according to product structure
Model according to customer drawing and sample.
High temperature resistance, corrosion resistance, wear resistance, high strength, high insulation performance
Electrical and electronic ceramics, electrical heater ceramics, textile ceramics, lamps ceramics, electrical resistance ceramics, engineering ceramics, temperature-controlled ceramics, mechanical ceramics, refractory ceramics, honeycomb ceramics and all kinds of ceramic ceramic tubes and rods