Polished Silicon Nitride Ceramic Cylinder Piston Plunger Shaft For
Medical Field
Silicon nitride Piston/Plunger is a material with high fracture toughness and excellent thermal
shock resistance,and in recent years it is also used as a
substitute for molds.It is used in the filed of machinery, electronic, semiconductor, chemical, petroleum, smelt.
Features
Silicon nitride is a gray ceramics,it has excellent resistance to thermal shock
resistance,and it has a property that is a comparatively hard to
get wettability with molten metal.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.
Application industry: Machinery, electronic, semiconductor, chemical, petroleum, smelt.
Specific application: Welding shaft, electronic substrate, plunger, nozzle, slide guide, diesel parts, metal molding, shaft wheels,die casting machine parts(plungers,sleeves,goosenecks)
Property for Si3N4 ceramic:
A.High strength over a wide temperature range
B.High fracture toughness
C.High hardness
D.Outstanding wear resistance
E.Good thermal shock resistance
F.Good chemical resistance
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
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.
Specification
| Material code | characteristics | Density(g/cm³) | Young's Moulus(GPa) | Flexural strength(MPa) | Fracture Toughness(MPa*m1/2) | Thermal Expansion RT~800°) | Thermal Conductivity(w/m*k) | Volume Resistivity(Ω*cm) |
|
| High Thermal shock resistance light weight high strength | 3.2 | 290 | 800 | 6 | 1.6 | 24 | ＞10⋀14 |
|
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Our Company
Wuxi Special Ceramic Electrical mainly produces alumina, Silicon
nitride, Zirconia, Steatite, Boron nitride, Cordierite,mullite
products, widely used in metal welding, electronic conductor,
mechanics, assembling, insulation, chemicals, instrument, textile,
nuclear industry, aerial field.We accept trial produce according to
the drawing or sample.It usually takes 15 days to finish trial
product.Mass produce usually takes 30 days.Goods' package is carton
or PLT.It can be negotiable with each other.
We mainly sell goods to toshiba lighting group in Japan and
Europe.Our aim is to deliver goods with high quality at quick delivery date.
Quality guarantee:mass produce by 100% inspection
