Vhandy Silicon Nitride Ceramic Grinding Ball Bead Si3n4 Mill Balls

Min.Order: 50

Product origin: Shenyang, Liaoning, China

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Description

Product Description

About Silicon Nitride (Si3N4)

Silicon nitride ceramic is an inorganic material ceramic that does not shrink when sintered.
Silicon nitride is very strong, especially hot pressed silicon nitride, which is one of the hardest substances in the world.
It has high strength, low density and high temperature resistance.

VHANDY provide 2 kinds of silicon nitride ceramics (GPSN and HPSN).

Characteristics and applications of silicon nitride

Silicon Nitride Properties:

High strength over a large temperature range
High fracture toughness
Good flexural strength
Mechanical fatigue & creep resistant
Lightweight - Low density
High hardness and wear resistance, both impingement and frictional modes

Superior thermal shock resistance
Low thermal expansion
Electrical insulator
Good oxidation resistance
Good chemical corrosion resistance
Wear resistant High stiffness

Silicon Nitride Properties:

Rotating ball & rollers bearings
Cutting tools
Engine components valves, rocker arm pads, seal faces Induction heating coil supports
Turbine blades, vanes, buckets Welding & brazing jigs

Heating Element components
Crucibles Metal tube forming rolls and dies
TIG / Plasma welding nozzles
Weld positioners
Precision shafts and axles in high wear environments
Thermocouple sheaths & tubes
Semiconductor Process Equipment

Two types and parameters of silicon nitride

Types of Silicon Nitride from VHANDY

There are several different methods used to produce Silicon Nitride, all producing materials with slightly differing properties.
Gas Pressure Sintered Silicon Nitride (GPSN)
Hot Pressed Silicon Nitride (HPSN)

Gas Pressure Sintered Silicon Nitride (GPSN)

The GPSN method uses a silicon nitride powder that has been mixed with sintering aids to promote liquid phase
sintering (typically yttria, magnesium oxide, and/or alumina)
The powder is pressed into the desired form and green-machining can take place.
The compacts are then placed into a furnace that has a pressurized nitrogen atmosphere to aid with densification
and prevent the evaporation/decomposition of the silicon, nitrogen and additives

Item	Unit	GPSN
Density	g/cm3	3.20±0.02
Elastic Modulus	Gpa	300~320
Crushing Load Ratio	(25ºC)%	30~35
Hardness	(HV)(Gpa)	1600-1800
Fracture Toughness	Mpa.m ^1/2	6.0~7.0
Bending Strength	Mpa	650~750
Poisson's Ratio		0.25
Coefficient of Heat Expansion	10-6K-1	3.0~3.2
Weber Modulus		10~12
Thermal Conductivity	W.(M.K) -1	15~20
Specific Resistivity		10¹⁸
Magnetic		No

Hot Pressed Silicon Nitride (HPSN)

HPSN is produced by uniaxially pressing silicon nitride powder (with sintering additives) while applying heat at the same time. A special type of press and die is required for this process. It produces a silicon nitride with excellent mechanical properties, however, only simple shapes can be produced. Because it is impossible to green-machine a component that is hot-pressed, diamond grinding is the only way to create complex geometries. Because of the high costs and difficulties associated with diamond grinding and hot-pressing, its use is typically limited to the production of simple components in small quantities.

Item	Unit	GPSN
Density	g/cm3	3.2~3.4
Bending strength	Mpa	≥900
Fracture toughness	Mpa.m ^1/2	6~8
Hardness (HV)	Gpa	15~17
Thermal conductivity	W/m.k	23~25
Thermal expansion coefficient	×10-6/ºC(0~1400ºC)	2.95~3

Shooting in kind

Company Profile

Shenyang Vhandy Technology Co., Ltd. has been committed to the design, development and manufacture of industrial ceramics, specialized in manufacturing and exporting ceramic products, such as zirconia ceramic, alumina ceramic, cordierite, mullite, ZTA, silicon carbide, silicon nitride, boron carbide, boron nitride, etc.

After years of efforts and explorations, rich experience has been accumulated, especially in domestic and oversea ceramic processing. Producing capabilities include the latest pressing and compaction technologies, state of the art CNC green machining, sintering and precision diamond grinding techniques. With senior scientists and skilled technicians, we can handle customer drawings under the R&D, producing and processing all types of ceramic pieces. Our products have already passed the ISO 9001 quality certification system and SGS ROSH system. Because of stable performance and high precision, our products have been successfully used in various areas, including electronic, mechanical, aerospace, textile, chemical fileds, as well as scientific researches.

Quality, service and reputation are three main purposes of our company. We will manage our production and check standards strictly according to client's drawings. We promise we will spare no efforts to serving our clients with high-quality products. Welcome clients around the world come to contact us.

Certifications

FAQ

Q: Are you trading company or manufacturer?
A: We are manufacturer.

Q: How long is your delivery time?
A: Generally within 30 working days, it is according to quantity.

Q: Do you provide samples? Is it free or extra?
A: The samples can be provided, but the shipping cost should be on buyer's account.

Q: What is your term of payment?
A: Payment<=10000 USD, 100% in advance. Payment>=10000 USD, 70% T/T in advance, balance before shipment.

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