Silicon Nitride Crucible, Si3N4 crucible

Product Information

Silicon Nitride (Si3N4) has the most versatile combination of mechanical, thermal, and electrical properties of any technical ceramic material. It is a high performance technical ceramic that is extremely hard and has exceptional thermal shock and impact resistance. It surpasses most metals high temperature capabilities and has a superior combination of creep and oxidation resistance. Additionally, its low thermal conductivity and high wear resistance make it an excellent material that can withstand the toughest of conditions in the most demanding industrial applications. Silicon Nitride is an excellent choice when high-temperature and high-load abilities are needed. Silicon nitride ceramic is an inorganic material ceramic that does not shrink during sintering. There are five different methods to produce Silicon Nitride including SRBSN, GPSN, HPSN, HIP-SN and RBSN, make the application and working material different slightly. In these 5 methods of production, GPSN is most commonly used to produce Si3N4 components. The strength of silicon nitride, especially hot-pressed silicon nitride, is one of the hardest substances in the world.

Silicon nitride crucible is sintered by gas pressure sintering, it has good resistance to acid and weak alkaline corrosion, such as boiled hydrochloric acid, concentrated nitric acid, aqua regia, sulfuric acid, sulfuric acid and aluminum hydroxide solution with a concentration below 25%. This dense silicon nitride has excellent oxidation resistance and can be used stably in an oxidizing atmosphere below 1400 ° C. Silicon nitride material also has good stability to metal melts and is not wetted, such as molten metals zinc, gold, silver, aluminum, cadmium, indium, lead, bismuth, gallium, germanium, etc. and their alloys such as yellow copper, hard aluminum, nickel silver, etc. all have good corrosion resistance. Silicon nitride ceramic is an inorganic material ceramic that does not shrink during sintering. The strength of silicon nitride, especially hot-pressed silicon nitride, is one of the hardest substances in the world.

Synonyms

Trisilicon tetranitride; Nierite

Silicon Nitride crucible Specification

Dimensions

Per your request or drawing

We can customized as required

Properties（Theoretical）

Gas Over-Pressure Sintered

Hot Pressed

Hot Isostatic Pressed

Silicon Nitride crucible Advantages

• 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 Machining

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

Applications of Silicon Nitride crucible

•Rotating ball bearings & rollers bearings

 -Bearing technology in automotive engineering

 -Valves, turbocharger rotors for engines

 -Diesel engine glow plugs

• Cutting tools

• Engine components: valves, rocker arm pads, seal faces

 -Seal Rings

• Induction heating coil supports

• Turbine blades, vanes, buckets

• Welding & brazing jigs -Welding Rollers

• Heating Element components

• Crucibles

• Metal tube forming rolls and dies

 -Molten metal handling

• TIG / Plasma welding nozzles

• Weld positioners

• Precision shafts and axles in high wear environments

• Thermocouple sheaths & tubes

• Semiconductor Process Equipment

 -Nozzles

 -Thermocouple sheaths

 -Centering Pins

 -Drawing Tools

 -High-performance Cutting Tools

 -Indexable Inserts

 -Tubes and Pipes

 -Mechanical Engineering Special Applications

Packing of Silicon Nitride crucible

Standard Packing:

Sealed bags in carton boxes. Special package is available on request.

As a ceramic material, Si3N4 is quite fragile in a lot of cases. The Si3N4 crucible are usually held in plastic bags by vacuum, and protected with heavy foam.

ATTs’ Si3N4 crucible is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.

Chemical Identifiers