Silicon Nitride Ceramic is one of the world's toughest products. It possesses superior properties such as high voltage strength, low density, and high temperature performance. It begins with silicon powder and shapes it conventionally, then conducts preliminary nitridation in nitrogen and at a high temperature of 1,200°C, where part of the silicon powder combines with nitrogen to create silicon nitride. The whole body already has a certain amount of strength. Then it is nitridated a second time at a temperature of 1,350°C to 1,450°C in a high-temperature furnace and reacted to form Silicon Nitride (Si3N4). General producing methodes are hot pressing and gas pressure sintering.

Si3N4 Ceramic is a kind of covalent bond compound. The [SiN4] tetrahedron is the fundamental structural structure. This arrangement is credited with a number of the properties of silicon nitride. Engineering ceramic silicon nitride, as an outstanding high-temperature technical material, will fully use its advantages in high-temperature applications. It is highly immune to high temperatures, withstanding temperatures of up to 1,200°C without losing strength, and will not melt after heating. The melt would not decompose until it reaches a temperature of 1,900°C. On the other side, due to Si3N4's low theoretical density, which is significantly lighter than steel and engineering super heat-resistant alloy steel, it can be used in place of alloy steel where high strength, low density, and high temperature resistance are needed. It could not be more appropriate. Additionally, silicon nitride high temperature ceramic exhibits extraordinary chemical corrosion tolerance, withstanding almost all inorganic acids and caustic soda solutions below 30%, as well as the corrosion of a wide variety of organic acids. It is also a high-performance electrical insulating medium.

Silicon nitride is a critical structural substance. It is an extremely tough composite that is lubricious and resistant to wear. With the exception of hydrofluoric acid, it is inert to most inorganic acids. It has a good tolerance to corrosion and is immune to high temperatures. Activation. Additionally, it is resistant to the effects of cold and sun. It would remain unbroken until heated to 1,000°C in the air, rapidly cooled, and then rapidly heated. It is precisely because silicon nitride Si3N4 has such excellent properties that it is often used to manufacture bearings, bearing balls, gas turbine blades, mechanical seal circles, permanent molds, heating tubes, riser tubes, thermocouple safety tubes, welding pins, and substrates, among other things.

Material Properties (GPSN)

ITEM	UNIT	ALUMINA \| A950	ALUMINA \| A990	ZIRCONIA \| YSZ95	SILICON NITRIDE \| GPSN
Main Content	-	95% Al₂O₃	99% Al₂O₃	ZrO₂>94.5%	Si₃N₄>95%
Colour	-	White	Ivory	White	Black
Density	g/cm³	3.70	3.85	5.95	3.22
Vickers Hardness	Gpa	14	17	12	15
Flexural Strength	Mpa	310	360	800	580
Compressive Strength	Mpa	2,200	2,500	2,500	2,200
Volume Resistivity	Ω·cm	>10¹⁴	>10¹⁴	>10¹⁰	>10¹²
Dielectric Strength	KV/mm	15	17	9	19
Dielectric Constant	1 MHz	8	9	28	9.6
Heat Conductivity	W/m.K	25	29	2.2	27
Maximum Operating Temp.	℃ / ℉	1,500 / 2,730	1,650 / 3,000	600 / 1,100	1,200 / 2,200
Thermal Shock Resistance	△T(℃)	210	230	260	750
Coefficient of Thermal Expansion (25 - 1,000 ℃)	10^-6/K	7 - 9	7 - 9	11 - 13	3 - 4

Note: Although we have no reason to doubt the accuracy of the data presented, this information is offered for comparison only. Exact properties will vary depending on the manufacturing method and part configuration, and can sometimes be tailored to meet specific requirements.