High Purity Al2O3 Alumina Ceramic Tube for Electrical Power Feedthrough

• Customization: Available
• Application: Automotive Industry, Electrical Industry, Electronic Industry, Refractory, Structure Ceramic, Industrial Ceramic, Brazing
• Electrical Insulation: High Voltage Insulator
• Model NO.: Customized
• Material: Alumina Ceramic, Alumina Ceramic
• Shape: Custom Shape
• Ceramic Tube & Rod: Ceramic Tube
• Product Name: Vacuum Ceramic Tube
• 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
• Type: Ceramic Tube, Ceramic Parts
• Transport Package: Vacuum Packaging
• Specification: As per the drawing
• Trademark: JingHui
• Origin: China
• HS Code: 8547100000
• Production Capacity: 50000PCS/Month

Product Description

High Purity Al2O3 Alumina Ceramic Tube for Electrical Power Feedthrough

Product Introduction

What is Ceramic Structural Parts?

Ceramic structural parts are precision ceramic parts obtained by using high-purity special ceramic materials, through rigorous structural design and appropriate forming method, and processed.

Ceramic metallization is the combination of two materials with different properties. The ceramic material has the characteristics of high strength, high hardness, high temperature resistance, corrosion resistance, and good insulation performance, while the metal material has the characteristics of good thermal conductivity, strong electrical conductivity, and good ductility.

The combination of ceramic and metal materials not only achieves complementary advantages in performance, but also broadens their respective application ranges.

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 have become high performance alternatives for structural parts made of traditional materials such as metal, plastic and glass in some fields.

Where are Ceramic Structural Parts Mainly Used?

Ceramic structural parts have very broad application prospects in semiconductor equipment, medical equipment, industrial equipment, wafer handling, electronic devices and other fields.

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

Production Process

Jinghui has been focusing on the production and processing of precision ceramic structural parts for more than ten years. As shown below, the production process of our ceramic structural parts is generally divided into five main steps, ceramic powder preparation - forming - sintering - post finishing - metallization.


Here we focus on the metallization process. We have the following 2 questions to discuss with you.

1. What is Metallization of Ceramic Structural Parts?

The metallization of ceramic surfaces is a process with high technical content. The specific influencing factors include metallization formula, metallization temperature and holding time, metallization microstructure, metallization coating thickness and coating method, etc.

The function of the metallization layer on the ceramic surface is to enhance or improve the surface properties of the product, such as oxidation resistance, wear resistance, corrosion resistance, and certain electrical, optical and tribological properties.

2. What are the Methods of Metallization of Ceramic Structural Parts?

Common metallization methods are Mo-Mn method, electroless nickel plating method, silver firing method and W-Au method, among which the Mo-Mn method is widely used because of its mature and stable process.

Introduction to Mo-Mn Method

The Mo-Mn method is to coat metal powders such as Mo powder and Mn powder on the ceramic surface, and then sinter at high temperature in a reducing atmosphere (hydrogen gas), thereby forming a metal layer on the ceramic surface. Because Mo and ceramics have similar thermal expansion coefficients, the thermal stress after bonding is small, so the bonding strength between the metal film and ceramics is high.

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

Product Recommendations

Thank you for your visit. We can produce and process various special-shaped and high-precision ceramic structural parts according to your requirements. We are confident that we can fulfill your product requirements well. Welcome to order with drawings or samples, and look forward to becoming your reliable partner!