| Customization: | Available |
|---|---|
| Application: | Automotive Industry, Electrical Industry, Electronic Industry, Refractory, Structure Ceramic, Industrial Ceramic, Brazing |
| Electrical Insulation: | High Voltage Insulator |
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| Property | Ceramic | Metal | Polymer |
| Hardness | High | Low | Bad |
| Elastic Modulus | High | Good | Low |
| High Temperature Resistance | High | Low | Bad |
| Thermal Expansion | Low | Good | Good |
| Malleability | Low | Good | Good |
| Corrosion Resistance | Good | Low | Low |
| Electrical Conductivity | Low | Good | Low |
| Density | Average | High | Low |
| Thermal Conductivity | Average | Good | Low |
About Forming Method
There are mainly Dry Pressing, Hot Pressing, Isostatic Pressing, and Ceramic Injection Molding (CIM), each of which has its own advantages and disadvantages. We will choose the most suitable forming method on the basis of saving costs and ensuring quality.
About Finishing Process
In order to achieve the precision of the product, most ceramic structural parts need further finishing treatment after the sintering process. The main finishing processes we use are machining (lapping, polishing...) and glazing.
About Metallization Process
After the surface of the ceramic material is metallized, it has both the characteristics of ceramics and the properties of metal.
Introduction to Mo-Mn Method
There are many methods for surface metallization of ceramic structural parts, and here we will focus on the Mo-Mn method. The simple mechanism of Mo-Mn method is:
Mo powder and Mn powder are used as the main raw materials, and a certain amount of other metal powders are added, as well as metal oxides as active agents (such as Al2O3, MgO, SiO2, CaO, etc.), sintered at high temperature in a reducing atmosphere to form a Mo layer. To prevent oxidation and improve wettability, after the metallized Mo layer is sintered, a layer of Ni can be plated on it.
The brief process of Mo-Mn method is shown in the picture below.
| Category | Property | Unit | 99.8% Al2O3 |
99.5% Al2O3 |
99% Al2O3 |
95% Al2O3 |
94.4% Al2O3 |
| Mechanical | Density | g/cm3 | ≥3.95 | ≥3.90 | ≥3.85 | ≥3.65 | ≥3.60 |
| Water absorption | % | 0 | 0 | 0 | 0 | 0 | |
| Vickers hardness | HV | 1700 | 1700 | 1700 | 1500 | 1500 | |
| Flexural strength | Mpa | ≥ 390 | ≥ 379 | ≥ 338 | ≥ 320 | ≥ 312 | |
| Compressive strength | Mpa | ≥ 2650 | ≥ 2240 | ≥ 2240 | ≥ 2000 | ≥ 2000 | |
| Fracture toughness | Mpam1/2 | 4-5 | 4-5 | 4-5 | 3-4 | 3-4 | |
| Thermal | Max. Service temperature (non-loading) |
ºC | 1750 | 1675 | 1600 | 1500 | 1500 |
| CTE (Coefficient of thermal expansion) 20-800ºC |
1×10-6/ºC | 6.5-8.2 | 6.5-8.0 | 6.2-8.0 | 5.0-8.0 | 5.0-8.0 | |
| Thermal shock | T (ºC) | ≥ 200 | ≥ 200 | ≥ 200 | ≥ 220 | ≥ 220 | |
| Thermal conductivity 25ºC |
W/(m·k) | 31 | 30 | 29 | 24 | 22.4 | |
| Specific heat | 1×103J/(kg·k) | 0.78 | 0.78 | 0.78 | 0.78 | 0.78 | |
| Electrical | Volume resistivity 25ºC |
ohm·cm | > 1×1014 | > 1×1014 | > 1×1014 | > 1×1014 | > 1×1014 |
| 300ºC | 1×1012 | 1×1012 | 8×1011 | 1012-1013 | 1012-1013 | ||
| 500ºC | 2×1012 | 5×1010 | 2×109 | 1×109 | 1×109 | ||
| Dielectric strength | KV/mm | 20 | 19 | 18 | 18 | 18 | |
| Dielectric constant (1Mhz) | (E) | 9.8 | 9.7 | 9.5 | 9.5 | 9.5 |
We hope that we will do our best to improve your product performance and reduce production costs with years of practical experience.
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