Sgj High Quality Silicon Nitride Si3n4 Ball & Tube & Bar & Sheet & Structural Components Silicon Nitride

• Application: Ceramic Decorations, Refractory, Structure Ceramic, Industrial Ceramic, High Temperature
• Material: Boron Nitride
• Type: Customized
• Transport Package: Individual Packing
• Specification: Non-Standard
• Trademark: SGJ
• Model NO.: Silicon Nitride Si3N4 Ball
• Origin: China
• HS Code: 6914100000
• Production Capacity: 1000000sets/Year

Product Description

Industrial Ceramics
Sgj High Quality Silicon Nitride Si3N4 Ball & Tube & Bar & Sheet & Structural Components Silicon Nitride

Boron Nitride Ceramics:

Boron nitride crystal belongs to the hexagonal crystal system, its structure is similar to that of graphite, and its performance has many similarities, so it is also called "white graphite". Boron nitride is a crystal composed of a nitrogen atom and a boron atom. The chemical composition is 43.6% boron and 56.4% nitrogen with four different variants: hexagonal boron nitride (HBN), rhombohedral boron nitride (RBN), cubic boron nitride (CBN) and wurtzite nitrogen. Boron (WBN).

 

Properties:

Boron nitride ceramic has good heat resistance, thermal stability, thermal conductivity and high temperature dielectric strength. It is an ideal heat dissipating material and high temperature insulating material. Boron nitride has good chemical stability and is resistant to most of the molten metal. It also has good self-lubricating properties. Boron nitride products have low hardness and can be machined with an accuracy of 1/100 mm.
 

   1) BN is the only machinable ceramic with a processing precision of 0.01mm;
    2) Insulation strength 2300v / cm, 8 times Al2O3; RT resistance > 10Ω.cm at 1000 ° C;
    3) Its melting point is as high as 2800 ° C, it is a typical electrical insulator, and also an excellent thermal conductor;
    4) Excellent thermal shock resistance, returning 100 times from 20 ° C to 1000 ° C without damage;
    5) General metals (iron, copper, aluminum, lead, etc.), rare earth metals, precious metals, semiconductor materials (silicon, potassium arsenide), glass, molten salt (crystal, fluoride, slag), inorganic acids, alkalis Does not react.
Boron nitride has excellent insulation properties, high thermal conductivity, chemical stability and machinability
As a semiconductor processing member, an electric furnace member, an electronic component assembly jig, etc.

 

Application:

Boron nitride ceramics can be used in the manufacture of high-temperature containers for metallurgical melting, semiconductor heat-dissipating insulation parts, high-temperature bearings, thermowells, and glass forming dies.

 

Item	Unit	Typical Values
Physical Properties
Color	White
Density	g/cm3	2.2-2.5
Chemical Formula	/	BN
Content	43.6% boron, 56.4% nitrogen
Water Absorption	0
Mechanical Properties
Rockwell  Hardness(45N)	R45N	40
Vickers Hardness (Load 500g)	Gpa(Kg/mm²)	24.5-28.2
Flexural Strength	Mpa	350-600
Compressive Strength	Mpa	800
Modulus of Elasticity	Gpa	441/475
Thermal Properties
Thermal Conductivity	W/m·K	25.25-41
Thermal Expansion Coefficient	10-6/ºC	3.8-5.12
Melting point	°C	3000
Maximum Use Temperature	°C	1800
Electronic Properties
Dielectric Constant	3000K	9.1
Volume Resistivity(400~600ºC)	Ω.cm	2.3~5.6M

SiSiC, Silicon Carbide Ceramic
Silicon carbide  is one material of very high strength and usually made into Reaction bonded silicon carbide ceramic posts / SiSiC pillars for energy saving . The Reaction bonded silicon carbide ceramic posts / SiSiC pillars for energy saving  are lightweight and keep straight after long time working. Its maximum working temperature is up to 1380ºC or 2500ºF. It  is mainly in sealing applications (sealing rings and bearings), high temperature applications (burners) and as abrasion-resistant materials (sandblasting nozzles). The whole production process of silicon carbide material, starting with mixing through processing and ending with final inspection of the final products is situated in our company.

Item	Unit	Data
SiSiC	%	85.07
Free silicon	%	13.79
Temperature	ºC	1380
Density	g/cm³	≥3.02
Open Porosity	%	<0.1
Moh's Scale of Hardness	-	13
Bending Strength	MPa	250(20ºC)
	MPa	280(1200ºC)
Modulus of Elasticity	GPa	330(20ºC)
	GPa	300(1200ºC)
Thermal Conductivity	W/m.k	45(1200ºC)
Coefficient of thermal expansion	k-1×10-6	4.5
Acid Alkaline -proof	-	Excellent

Si₃N₄ ceramic
Silicon nitride is a kind of superhard material, which has lubricity, wear resistance, corrosion resistance and oxidation resistance at high temperature. It also resists cold and hot shocks and is heated to 1 in the air ºC more than 1,000, rapid cooling and then rapid heating will not break apart, it is often used to make mechanical components such as bearings, turbine blades, mechanical seal rings, molds, etc. Silicon nitride ceramic has excellent mechanical, performance and processability, high temperature resistant ceramics, corrosion resistant ceramics, wear resistant ceramics, absolute magnetic ceramics, insulating ceramics and self-lubricating ceramics, etc. silicon nitride ceramic shaft sleeve is widely used in magnetic drive pump, chemical pump, mortar pump, mud pump, piston pump and so on. It has the advantages of excellent corrosion resistance, high coefficient of heatconductivity, self-lubricity, small expansion and so on. It can be widely used in the petroleum, chemical, machinery building, metallurgical industry and motors industries. The frictional factor of combinationof silicon carbide and carbongraphite is the least.

Features
1.The wear-resistant parts of the pulverizer.
2.Ceramic bearings, heat exchangers.
3.Chemical pump parts, various nozzles.
4.High temperature cutting tools, fire resistant plates.
5.Mechanical wear-resistant parts.
6.Steel return raw material, arrester.
7.Spare parts for other semiconductor manufacturing.

Performance Index Of Si₃N₄ Ceramics

Type	Condition	Performance
Main Components	Normal Temperature	Si3N4≥95%
Bulk Density-g/cm^3	Normal Temperature	3.22
Elastic Modulus-Gpa	Normal Temperature	350
Vickers Hardness-HV	Normal Temperature	1870
Bending Strength-Mpa	Normal Temperature	780
Fracture Toughness-MPa·m^1/2	Normal Temperature	7.2
Thermal Expansion Coefficient-10^-6/K	20-1000ºC	3.2
Thermal Conductivity-W/	20-1000ºC	25

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Glazed Alumina Ceramics

Glazed Alumina Ceramics is a kind of material based on alumina, which is used in thick film integrated circuits. Alumina ceramics have good conductivity, mechanical strength and high temperature resistance. Alumina ceramics are widely used. Because of its superior performance, it has been widely used in modern society to meet the needs of daily use and special performance.
Alumina electrical ceramics have low dielectric constant, low dielectric loss, high insulation strength, high volume resistivity, good bending strength, high stability, high compressive strength and good cold and hot shock resistance. It is widely used in temperature controller, insulation parts, thermal equipment, electric heating equipment, iron structure building, shipbuilding and so on.

Alumina Manufacturing Description:
Alumina Ceramics can be produced in a wide range of purities with additives designed to enhance its properties. Typical purities range from 85 to 99.7% although Precision Ceramics generally work over 99.7% material.

It can be injection molded, die pressed, isostatically pressed, slip cast and extruded. Once fired and sintered, it can only be machined using diamondgrinding methods but prior to sintering advanced green and biscuit machining techniques developed by Precision Ceramics allow more complex components to be manufactured using traditional machining methods. In addition Alumina can be readily joined to metals or other ceramics using metallising and brazing techniques.

Alumina can be machined in green, biscuit, or fully dense states. While in the green or biscuit form it can be machined relatively easily into complex geometries. However, the sintering process that is required to fully densify the material causes the alumiuna body to shrink approximately 20%. This shrinkage means that it is impossible to hold very tight tolerances when machining alumina pre-sintering. In order to achieve very tight tolerances, fully sintered material must be machined/ground with diamond tools. In this process a very precise diamond coated tool/wheel is used to abrade away the material until the desired form is created. Due to the inherit toughness and hardness of the material, this can be a time consuming and costly process.

Precision Ceramics specialises in tight tolerance, highly complex work and has extensive in-house machining facilities - including 4th & 5th axis machining centres, drilling, grinding, milling, polishing, sawing, tapping, threading and turning - to enable us to manufacture Alumina components to the highest specifications.

Precision Ceramics is your Alumina machining specialist for your technical ceramic prototyping & manufacturing needs; we are always happy to use our many years of advanced ceramics experience to provide advice on materials, design, and application. If you would like to buy Alumina plates, rods, tubes or custom machined components, please contact SGJ for more details.

Alumina Electrical Ceramics
Alumina electrical ceramics have low dielectric constant, low dielectric loss, high insulation strength, high volume resistivity, good bending strength, high stability, high compressive strength and good cold and hot shock resistance. It is widely used in temperature controller, insulation parts, thermal equipment, electric heating equipment, iron structure building, shipbuilding and so on. Alumina is the most cost effective and widely used material in the family of engineering ceramics. Extremely High Purity, Temperature & Strength; Excellent Corrosion, High Strength, Wear Resistant, Electronic Insulating, Structural & Metalizing, Porous, Easily Degassed & Machinable. The raw materials from which this high-performance technical grade ceramic is made are readily available and reasonably priced, resulting in good value for the cost in fabricated alumina shapes.
Glazed Alumina Ceramics is a kind of material based on alumina, which is used in thick film integrated circuits. Alumina ceramics have good conductivity, mechanical strength and high temperature resistance. Alumina ceramics are widely used. Because of its superior performance, it has been widely used in modern society to meet the needs of daily use and special performance.

SGJ Alumina Ceramic Features:
• Excellent electrical insulation properties
• High compressive and dielectric strength
• High hardness and mechanical strength
• High thermal conductivity and thermal shock resistance
• Low density
• Resistant to strong acid and alkali attack at high temperatures
• Transparent to microwave radio frequencies
• Very specific thermal conductive and thermal expansion rates
• Wear and abrasion resistant

SGJ 96% alumina is an easily metallisable ceramic composition:

This material SGJ 96% alumina material is an excellent electrical insulator that can be metallised to facilitate high-temperature brazing of assemblies. This material features:

• Very high volume resistivity
• Low loss, constant high dielectric
• High density, non-porous and vacuum tight
• Resists abrasive wear and chemical attack

The fact that this material can be metallised makes this a good choice for many ceramic to metal or brazed assemblies such as high-vacuum systems, laser equipment (gas, solid-state and waveguide), X-ray tubes and electron microscopes, microwave windows and insulators in medical and scientific equipment.
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