Sialon Silicon Nitride Thermocouple Protection Sheath for Molten Metal

Product Description

Sialon Silicon Nitride Thermocouple Protection Sheath for Molten Metal
 

The Prime Characteristics

1. Low density:  3.2 g/cm³   with lightweight than most of other technical ceramics

2. Superior hardness, it's one of most hardest technical ceramics than others
3. Great wear resistance due to its exceptional hardness and self-lubricity
4. Low coefficient of thermal expansion and high thermal conductivity (20 W/m.k)
5. Great thermal shock resistance, it's up to 1000ºC under the special atmosphere
6. High mechanical strength and well resistance to impact than other advance ceramics
7. Heat & high-temperature resistance, The max. service temperature can be up to 1300ºC
8. Chemical and corrosion resistance, resistant to almost all inorganic acids and many organic acids
9. At the same time, Silicon nitride is a high-performance electrical insulation material
 

The specification

The specification of the ceramic thermocouple tube

Material option	Silicon nitride(Si3N4), Zirconia (ZrO2),  Alumina(Al2O3)
Forming methods	Dry pressed, Ceramic injection molding, Hot pressed, ISO pressed
Specification	OD can be from 1 to 50mm, length can be from 10mm to 800mm
Precision processing	CNC machining, Precision grinding, Polishing, Lapping,
Tolerance	The tolerance of OD and ID can be 0.001mm,  the tolerance of length can be 0.001mm
Key parameters	Roughness to be 0.02mm, Parallelism to be 0.001mm
Surface quality	Free of cracks, foreign contamination, mirror surface better than Ra0.1

 

Product Description

 

The description of silicon nitride ceramic thermocouple tube
Silicon nitride is a man-made compound synthesized through several different chemical reaction methods. Parts are pressed and sintered by well-developed methods to produce a ceramic with a unique set of outstanding properties. The material is dark gray to black in color and can be polished to a very smooth reflective surface, giving parts with a striking appearance. High-performance silicon nitride materials were developed for automotive engine wear parts, such as valves and cam followers, and proven effective. The cost of the ceramic parts never dropped enough to make the ceramics feasible in engines and turbochargers. The very high-quality bodies developed for these demanding high-reliability applications are available today and can be used in many severe mechanical, thermal, and wear applications.


The gallery of Si3N4 ceramic parts









 

Datasheet of Technical ceramics

Property	Unit	Material
		Si3N4	99.5% Al2O3	99% Al2O3	96% Al2O3	ZrO2
Density	g/cm^3	≥3.20	≥3.90	≥3.85	≥3.65	≥6.0
Water absorption	%	-	0	0	0	0
Hardness	HV	-	1700	1700	1500	1300
Flexural strength	Mpa	≥600	≥379	≥338	≥320	≥1200
Compressive strength	Mpa	≥2500	≥2240	≥2240	≥2000	≥1990
Fracture toughness	Mpa m^1/2	6	4-5	4-5	3-4	6.5-8
Max. service temperature	ºC	1200	1675	1600	1450	1000
Coefficient of thermal expansion (CTE)	1×10 ^-6/ºC	3.2	6.5~8.0	6.2~8.0	5.0~8.0	8.0~9.5
Thermal shock	T(ºC)	≥600	≥250	≥200	≥220	≥300
Thermal conductivity(25ºC)	W/m.k	20	30	29	24	3
Volume resistivity	ohm.cm
25ºC		-	>1 x 10^14	>1 x 10^14	>1 x 10^14	>1 x 10^11
300ºC		-	1 x 10 ^12	8 x 10^11	10^12 -10^13	1 x 10 ^10
500ºC		-	5 x 10 ^10	2 x 10^9	1 x 10^9	1 x 10^6
Insulation strength	KV/mm		19	18	18	17
Dielectric constant(1Mhz)	(E)	6	9.7	9.5	9.5	29

 

Our capability and strength

We have in-housing comprehensive manufacturing types of equipment, including forming, sintering,
CNC machining, precision grinding, laser cutting, and so on, it helps us to control the quality very well.
Also, it greatly benefits cost control.

The state of the art manufacturing equipment






Rigorous Quality-control System




Remark:
We have the complete quality-control system per ISO9001, including IQC, IPQC, QA, and OQC process.


Typical Packaging Proposal and Transportation Methods
1. Packaging proposal


2. Regular Transporation Methods

 

FAQ

Q1. Are you a factory or trading company?
A: We are a manufacturer of over 16 years of experience. You are welcome to visit our factory.

Q2: Do you send a sample to check?
A: Sure, the sample is free and freight collect.

Q3: When will you ship it?
A: If the products are in storage, we'll ship within 48 hours

Q4: When can I get the price?
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.

Q5: Is it available to provide customized products?
A: We always support custom-made demand as per different materials, dimensions, and designs.