Alumina Metallized Ceramic for Electrical Relay

• Application: High Voltage DC Relay Ceramic Package
• Type: Ceramic Parts
• Product Name: Metallized Ceramic Parts for Relays
• Shipping Cost: Estimated freight per unit.: about shipping cost and estimated delivery time.
• Currency: US$
• Return&refunds: You can apply for a refund up to 30 days after receipt of the products.
• Model NO.: Customized
• Optional Purity: 94.4%-99.8% Alumina
• Color: White, Beige, Pink
• Further Finishing Treatment: Machining, Glazing, etc
• Surface Metallization Process: Mo-Mn Method
• Feature: High Performance and High Precision
• Material: High Purity Alumina Ceramic
• Transport Package: Vacuum Packaging
• Trademark: JingHui
• Origin: China
• HS Code: 8547100000
• Package Size: 36.00cm * 20.00cm * 24.00cm
• Package Gross Weight: 8.000kg

Product Description

Alumina Metallized Ceramic for Electrical Relay

Product Introduction

Why do High-voltage DC Relays Need Ceramic Packages?

High-voltage DC relays are the core components of new energy vehicles and charging piles. High-voltage DC relays are packaged with ceramics to obtain a vacuum environment and are safer.

Ceramics have high hardness and high melting point. They will not deform under high temperature and impact, and will not melt under the action of electric arc. They are ideal insulating materials for making high-voltage and high-current electronic components.

Production Process

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?

Jinghui is proficient in the surface metallization process of ceramic structural parts such as Mo-Mn method, electroless nickel plating method, silver firing method and W-Au method. Here we focus on the electroless nickel plating method.

Introduction to Mo-Mn Method
 

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.

The brief process of Mo-Mn method is shown in the picture below.

Product Parameters

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/cm^3	≥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	Mpam^1/2	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	1×10^3J/(kg·k)	0.78	0.78	0.78	0.78	0.78
Electrical	Volume resistivity 25ºC	ohm·cm	> 1×10^14	> 1×10^14	> 1×10^14	> 1×10^14	> 1×10^14
	300ºC		1×10^12	1×10^12	8×10^11	10^12-10^13	10^12-10^13
	500ºC		2×10^12	5×10^10	2×10^9	1×10^9	1×10^9
	Dielectric strength	KV/mm	20	19	18	18	18
	Dielectric constant (1Mhz)	(E)	9.8	9.7	9.5	9.5	9.5

Our Partners

 

Certifications

Why choose us?

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.