High Purity Al2O3 Alumina Ceramic Bushings

The description of alumina al2o3 ceramic bushing

Aluminum Oxide, also called as alumina, is the most extensively used technical ceramic material due to their outstanding characteristics and cost-effective advantage. As with the purity increases, both wear resistance and corrosion resistance also increases relatively, so alumina are grouped together based on purity levels, including 75% alumina, 85% alumina, 90% alumina, 95% alumina, 99% alumina, 99.5% alumina, 99.8% alumina, 99.9% alumina.
Alumina ceramic bushings generally used as a kind of standard protection part, so our facility has many selections of stocks. Our vast, readily-available inventory allows us to supply our customer’s ceramic tube needs immediately, even for hard-to-find or specialty products. Aluminas are used in a variety of general-purpose applications, and their grade is chosen based on the application environment. Additionally, different purity alumina can be formulated in our factory if needed for more demand applications 

The specification of the al2o3 ceramic bushing

1. Material options:  alumina ( purity range from 95% to 99.9%), zirconia,silicon nitride, boron nitride

2. Forming methods: dry pressed, hot pressed, extrusion, ceramic Injection molding, Isostatic pressed

3. Dimension capability: the min. inner diameter can be 1mm, the max. outer diameter up to be 800mm

4. Available design: both ends open, one end closed, multiply holes, side-slot, steps, threaded, half tubes.

5. Secondary processing: CNC machining, lapping, grinding, drilling, threaded,precision cutting and so on

6. Tolerance: outer diameter can be 0.005mm, inner diameter can be 0.01mm, overall length can be 0.01mm

7. Surface treatment: external and internal surface to be lappend, polished, glazed or metallized

The prime characteristics of alumina ceramic bushing

1. High temperature resistance, it can withstand up to 1750℃ in the air condition, but up to 2200℃ in vacuum atmosphere

2. Outstanding wear resistance, over 276 times in comparison with stainless steel

3. Exceptional corrosion resistance, it can withstand various strong acid and alkali, like HF, H2SO4

4. Extraordinary electrical insulation, it always use in many high voltage, high-current application

5. Great mechanical properties,  hardness, compressive and flexural strength are much higher stainless steel

The gallery of the alumina ceramic bushing

    

Remark:

We are able to achieve a variety of special requirement of ceramic tubes, including different materials,

different designs, different geometries.

The technical datasheet of various different purity of alumina

Gerneral	Property	Units	99.5% al2o3	99.2% al2o3	95% al2o3
Mechanical	Density	g/cm3	≥3.90	≥3.85	≥3.65
	Water absorption	%	0	0	0
	Hardness	HV	1700	1700	1500
	Flexural strength	Mpa	≥379	≥338	≥320
	Compressive strength	Mpa	≥2240	≥2240	≥2000
	Fracture toughness	Mpam^1/2	4-5	4-5	3~4
Thermal	Max. service temperature (Non-loading)	℃	1700	1600	1500
	CTE (20-800℃)	1×10 -6 /℃	6.5~8.0	6.2~8.0	5.0~8.0
	Thermal shock	T(℃)	≥250	≥220	≥200
	Thermal conductivity	W/m.k	30	29	24
	Specific heat	1 x 10^3 J/(kg·K)	0.78	0.78	0.78
Electrical	Volume resistivity
	25℃	ohm.cm	＞1 x 10^14	＞1 x 10^14	＞1 x 10^14
	300℃		1 x 10^12	8 x 10^11	10 ^12 -10^13
	500℃		5 x 10^10	2 x 10^ 9	1 x 10^9
	Insulation strength	KV/mm	19	18	18
	Dielectric constant （1Mhz）	(E)	9.7	9.5	9.5

Our advantage and strength

FAQs (Frequently Asked Questions)

Q1: Is it available to produce customized products?
A: We always support custom-made ceramic tubes as per different dimensions, designs, surface treatment.

Q2. When can I get the price after sending the inquiry?
A: We regularly quote within 24 hours after we get your inquiry. If you are in urgent need of getting the price, 

please call us or tell us in your email so that we will proceed with your inquiry as a priority. 

Q3. How to ensure quality in your factory?
A: The strict quality-control will be done in the production line, including IQC, IPQC, QA, OQC, 

also both CKP, AQL are regularly used in the production.
Q4. Are you a factory or trading company?
A: We are a professional manufacturer. You are welcome to visit our factory and cooperate with us.

Q5.Can you produce other technical ceramic parts?

A: We also focus on producing metalized ceramics, industrial ceramic plate, ceramic seals and textile ceramics.