| Application: | Refractory, Electronics, Structure Ceramic, Industrial Ceramic |
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| Type: | Ceramic Parts |
| Product Name: | Metallized Ceramics |
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Shipping Cost:
Estimated freight per unit. |
about shipping cost and estimated delivery time. |
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| Initial Payment Full Payment |
| Currency: | US$ |
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| Return&refunds: | You can apply for a refund up to 30 days after receipt of the products. |
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Jinghui Ceramic produces a variety of high-purity alumina metallized ceramics. The products are mainly used in high-voltage and high-current applications. The industry fields include vacuum electronics, medical care, new energy vehicles, and aerospace.
Our alumina metallized ceramics generally use 95%, 99% or 99.5% alumina. We can produce a variety of custom ceramic parts to suit different applications. At the same time, we metallize designated areas of the part so that the ceramic can subsequently be brazed to the metal component.
Our production process is mainly divided into 3 steps, forming - finishing - metallization. The production flow chart is shown below.
1. Forming Method / Molding Craft
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?
Jinghui Ceramic has rich experience in manufacturing precision ceramic parts, and is proficient in the surface metallization process of ceramic structural parts such as Mo-Mn metallization, electroless nickel plating method, silver metallization and DBC technology. Here we focus on the electroless nickel plating method.
Introduction to Electroless Nickel Plating Method
Electroless nickel plating, also known as chemical nickel plating or autocatalytic nickel plating, is to reduce the nickel ions in the plating solution to metal and to deposit them onto the surface of the ceramic with the help of a suitable reducing agent without an external current.
The brief process of electroless nickel plating method is shown in the picture below.
Advantages of Electroless Nickel Plating Method
1. Uniform coating and small pinholes.
2. Low cost, suitable for mass production.
Below is the data sheet of our alumina ceramic materials.
| 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 |
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