Products

Ceramic Tube for Furnace

Brand:Yunxing
Product origin:China
Delivery time:Depending on product size and quantity
Supply capacity:5,000-10,000/month(Looking for distributors)

▪ Made by 99.3%-99.7% high purity alumina. ▪ Max working temperature is 1800℃. ▪ The quality can pass the SGS and DIN43724/DIN43725/DIN40680. ▪ Both end open with good verticality. ▪ Can produce the 2-10 holes, max length 1850 mm.

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Ceramic Tube for Furnace

Practical application advantages

1. Excellent material performance

The ceramic tube is made of high-purity alumina and has the following characteristics:

The hardness of high-purity alumina ceramics can reach above HRA90, and its wear resistance is more than 10 times that of ordinary metal materials, making it suitable for the conveying scenarios of materials containing solid particles.

High-purity alumina ceramics can withstand high-temperature environments above 1200°C. Some silicon carbide materials can even work for a long time at 1400°C while maintaining structural integrity.

High-purity alumina ceramics can resist the erosion of acids, alkalis, salts and corrosive gases, and are particularly suitable for highly corrosive environments such as the chemical and metallurgical industries.

2. Structural design optimization

Alumina ceramic material itself has low electrical conductivity, which reduces the accumulation of static electricity and makes it suitable for the production of electronic components.

The precisely processed smooth surface reduces the adhesion of materials, minimizes the risk of blockage, and simultaneously enhances the scratch resistance.

3. Significant economic benefits

The service life of the alumina ceramic tube is 3 to 5 times longer than that of the metal tube, reducing the frequency of shutdown for replacement.

Alumina ceramic tube reduces the need for manual maintenance. Especially under complex working conditions (such as coal injection in blast furnaces and transportation of coal slime), the maintenance efficiency is increased by more than 50%.

Suitable for industrial furnace types

1. Metallurgical Industrial Furnaces

Alumina ceramic tubes are used for the transportation of coal powder, resisting the erosion of high-speed particles and high-temperature oxidation.

In vacuum degassing and secondary steelmaking (refining outside the furnace), alumina ceramic tubes serve as the conveying channels for inert gases or alloy additives to avoid the contamination of molten steel.

2. Heat Treatment Furnace

The alumina ceramic heating core (such as the knotted electric heating tube) provides uniform thermal radiation at a temperature range of 1000-1200°C, which is suitable for metal tempering and annealing processes.

Combined with a vacuum or inert gas environment, the alumina ceramic tube is used to protect the heating element, prevent oxidation and improve the thermal efficiency.

3. Chemical Reaction Furnace

The alumina ceramic tube can transport corrosive media.

It can replace the metal heat exchanger, achieve efficient heat exchange in the flue gas at 1300°C, and extend the service life of the equipment.

4. Electrical and Electronic Industrial Furnaces

The alumina ceramic tube is used to support the heating element or serve as a gas channel, ensuring a high-purity environment during the sintering of electronic components such as chips and resistors.

The alumina ceramic tube, as the inner lining of the furnace chamber, isolates the materials from external contamination and is suitable for the heat treatment of precision materials.

Size,Performance index

Alumina Tube(open both ends)(slip casting) Specification Table:

Number	SPEC: OD x ID		LENG TH MM	Number	SPEC: OD x ID		LENG TH MM
Number	INCH	MM	LENG TH MM	Number	INCH	MM	LENG TH MM
1	0.197x0.118	5x3	≤800	32	1.126x0.886	28.6x22.5	≤1800
2	0.236x0.157	6x4	≤1300	33	1.181x0.827	30x21
3	0.250x0.125	6.4x3.2		34	1.181x0.906	30x23
4	0.250x0.157	6.4x4		35	1.260x0.984	32x25
5	0.250x0.188	6.4x4.8		36	1.375x1.125	34.9x28.6
6	0.276x0.157	7x4		37	1.378x1.063	35x27
7	0.276x0.197	7x5		38	1.496x1.181	38x30
8	0.315x0.197	8x5		39	1.575x1.181	40x30
9	0.354x0.236	9x6	≤1600	40	1.654x1.339	42x34
10	0.375x0.250	9.6x6.4		41	1.750x1.500	44.5x38.1
11	0.394x0.236	10x6		42	1.811x1.496	46x38
12	0.394x0.276	10x7		43	1.875x1.625	47.6x41.3
13	0.433x0.276	11x7		44	1.969x1.575	50x40
14	0.472x0.236	12x6		45	2.000x1.750	50.8x44.5
15	0.472x0.315	12x8		46	2.250x2.000	57.2x50.8
16	0.472x0.355	12x9		47	2.283x1.890	58x48
17	0.500x0.250	12.7x6.4		48	2.362x1.96	60x50
18	0.500x0.375	12.7x9.5		49	2.500x2.250	63.5x57.2
19	0.551x0.394	14x10		50	2.559x2.165	65x55
20	0.591x0.394	15x10	≤1800	51	2.750x2.500	69.9x63.5
21	0.630x0.472	16x12		52	2.756x2.362	70x60
22	0.669x0.472	17x12		53	2.956x2.561	75x65
23	0.688x0.437	17.5x11.1		54	3.000x2.750	76x70
24	0.750x0.512	19.1x13		55	3.150x2.675	80x68
25	0.787x0.591	20x15		56	3.500x3.125	88.9x79.4	≤1600
26	0.866x0.630	22x16		57	3.543x3.150	90x80
27	0.866x0.669	22x17		58	3.937x3.543	100x90
28	0.945x0.709	24x18		59	4.000x3.650	101.6x93
29	1.000x0.750	25.4x19.1		60	4.331x3.937	110x100	≤1500
30	1.063x0.669	27x17		61	4.500x4.125	114.3x105
31	1.063x0.787	27x20		62	4.724x4.331	120x110

Insulation tube (extrusion) Specification Table

Number	1 Bore tube SPEC: OD x ID		Length MM
Number	INCH	MM	Length MM
1	0.031x0.011	0.8x0.3	≤1800
2	0.039x0.019	1x0.5
3	0.059x0.024	1.5x0.6
4	0.079x0.039	2x1
5	0.100x0.050	2.5x1.3
6	0.118x0.059	3x1.5
7	0.118x0.079	3x2
8	0.125x0.063	3.2x1.6
9	0.157x0.079	4x2
10	0.197x0.118	5x3
11	0.236x0.118	6x3
12	0.236x0.157	6x4
13	0.250x0.125	6.4x3.2
14	0.250x0.157	6.4x4
15	0.250x0.188	6.4x4.8
16	0.276x0.197	7x5
17	0.315x0.197	8x5
18	0.354x0.236	9x6
19	0.374x0.250	9.5x6.35
20	0.394x0.236	10x6
21	0.433x0.276	11x7
22	0.472x0.315	12x8

Alumina ceramic performance index (Notice of Correct in Leakeage Rate）

NO.	Property	Unit	Alumina
1	Al2O3	%	>99.3
2	SiO2	%	—
3	Density	g/cm3	3.88
4	Water absorption	%	0.01
5	Compressive strength	MPa	2300
6	20℃ leakage rates	Torr・L/sec	>10-11=1.33322×10-12Pa・m3/sec
7	Twisting in high temperature	mm	0.2 allowed in 1600℃
8	Bonding in high temperature		not bonded in 1600℃
9	20—1000℃ coefficient of thermal expansion	mm.10-6／℃.m	8.2
10	Thermal conductivity	W/m.k	25
11	Electric insulation strength	KV/mm	20
12	20℃direct current insulation resistance	Ohm/cm	1014
13	High-temperature insulation resistance	1000℃ MΩ	≥0.08
13	High-temperature insulation resistance	1300℃ MΩ	≥0.02
14	Thermal shock resistance		4 times not cracked in 1550℃
15	Maximum working temperature	℃	1800
16	Hardness	Mohs	9
17	Flexural strength	Mpa	350

Factory Equipment

Alumina Ceramic Tube

Slip casting moulding: Inject the prepared slurry into the gypsum mold and let it stand for a period of time to allow the gypsum mold to absorb moisture. The slurry forms a uniform body on the inner wall of the mold.
Injection moulding: Inject a slurry containing paraffin into a metal mold at a certain temperature and pressure, and after the body cools and solidifies, perform demolding to prepare ceramic bodies.
Extrusion moulding: Suitable for long tube products, the powder is extruded into shape through an extruder.

FAQ

Q1. Can alumina ceramic tubes withstand rapid temperature changes?

A1. Certainly, alumina ceramic tubes demonstrate commendable thermal shock resistance, enabling them to endure rapid temperature fluctuations without experiencing cracks or fractures.

Q2. Can alumina ceramic tubes be customized according to specific environments?

A2. Indeed, numerous suppliers provide the option to customize alumina ceramic furnace tubes according to specific requirements. This customization may involve modifications to dimensions, form, and the incorporation of additional features, ensuring alignment with the precise needs of your application.

Q3. How long can alumina ceramic tubes be used?

A3. The durability of alumina ceramic tubes can differ based on factors like application conditions, operational temperatures, and maintenance proced.

Alumina Ceramic