| Customization: | Available |
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| Application: | High Voltage DC Relay Ceramic Package |
| Type: | Ceramic Parts |
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How Our Ceramic Parts are Produced?
Jinghui has been focusing on the production and processing of precision ceramic structural parts for more than ten years. As shown below, our product production is mainly divided into 3 steps, forming - finishing - metallization.
1. 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.
2. 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.
3. Metallization Process
Metallization of ceramics refers to the creation of thin metal layers (films) on the surface of ceramics. After the surface of the ceramic material is metallized, it has both the characteristics of ceramics and the properties of metal.
Which Metallization Processes We Support?
| Simple Mechanism of Mo-Mn method | Advantages of Mo-Mn method |
| 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. |
(1) The process is mature and stable. (2) High bonding strength, especially suitable for applications under harsh mechanical and climatic conditions. (3) It can be repaired many times without damaging the metallization layer. (4) The requirements for solder, metallization paste formula and sintering atmosphere are not very strict, and the process is easy to master. |
Among the raw materials of ceramic structural parts, alumina ceramics are the most widely used due to the wide source of alumina raw materials, low price and mature production technology. The material properties of alumina ceramics are shown in the table 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 |
Jinghui is an enterprise specializing in the research and production of precision ceramics. Metallized ceramics are our superior products. They have excellent high-frequency and high-voltage insulation properties, high sealing strength, and good vacuum airtightness.
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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