Al2O3 Aluminum Oxide Ceramics with Mo-Mn Metallization Alumina Structural Components

Product Description

Al2O3 Aluminum Oxide Ceramics with Mo-Mn Metallization Alumina Structural Components

Product Introduction

Introduction to Ceramic Structural Parts

Ceramic structural parts have the advantages of superior strength, hardness, insulation, heat conduction, high temperature resistance, oxidation resistance, corrosion resistance, wear resistance, high temperature strength, etc., so they exhibit high stability and excellent mechanical properties in very harsh environments or engineering application conditions. It has attracted much attention in the industry, and its scope of use is also expanding day by day.

What Raw Materials are Used in Ceramic Structural Parts?

Considering cost-effectiveness, we generally choose alumina, aluminum nitride, zirconia, silicon nitride, etc. Ceramic structural parts made of them have become high performance alternatives for structural parts made of traditional materials such as metal, plastic and glass in some fields. The following is a comparative table between different material structural parts.
 

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

Advantages of Alumina Ceramic Structural Parts

Alumina ceramics are ceramic materials with Al2O3 as the main raw material and corundum (a-Al2O3) as the main crystal phase. Due to the wide source of raw materials, relatively low price, and mature processing technology, alumina ceramics have also established a high position in the field of ceramic materials, and are widely used in electronics, electrical appliances, machinery, textiles, aerospace and other fields.

Alumina ceramic structural parts have the advantages of high mechanical strength, high hardness, and low high-frequency dielectric loss.

Product Parameters

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

Production Process

Our product production is mainly divided into 3 steps, forming - finishing - metallization. The production flow chart is shown below.


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 ceramic surface is metallized, it has both the characteristics of ceramics and the properties of metal.

Introduction to Mo-Mn Method

Metallized ceramic structural parts are widely used in the fields of new energy vehicles, electronics, semiconductor packaging and IGBT modules. The metallization method of ceramic structural parts is mainly to sinter a layer of metal film on the ceramic surface to achieve the purpose of ceramic metallization.

In the field of ceramic metallization, the most widely used method is the molybdenum-manganese method. The Mo-Mn method is based on the refractory metal powder Mo, and then adds a small amount of low-melting Mn metallization formula, adds a binder and coats the ceramic surface, and then sinters to form a metallization layer.

The following is the general process of the Mo-Mn method applied to the surface of the ceramic structural parts.


Advantages of Mo-Mn Method

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.

Product Recommendations

Our Advantages

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.