Silicon carbide is available in two forms, reaction bonded and sintered. Both materials are ultra hard and have a high thermal conductivity. This has led to silicon carbide being used in bearing and rotary seal applications where the increased hardness and conductivity improves seal and bearing performance.
Silicon Carbide for Abrasive Applications
Black Silicon Carbide
Black silicon carbide is brittle and sharp. Grinding wheels and sandpaper made of black silicon carbide are suitable for grinding of metal and nonmetallic materials of low tensile strength such as gray cast iron, brass, aluminum, stone materials, leather and rubber etc.
Figure 1. Examples of silicon carbide
Green Silicon Carbide
Green Silicon Carbide Suitable for manufacturing grinding tools of cemented carbide, titanium alloy, high speed steel. It can also be used for polishing nonmetallic material such as glass, ceramics.
Silicon Carbide Applications in the Refractories Industry
Reaction bonded silicon carbide (RBSC) has good properties at elevated temperatures and can be used in refractory applications.
Silicon carbide materials exhibit good erosion and abrasive resistance, these properties can be utilised in a variety of applications such as spray nozzles, shot blast nozzles and cyclone components.
Silicon Carbide Burnner Nozzles
Vacuum reaction sintered carbofrax torching snouts are the perfect kiln suppliers of roller bed kiln, tunnel kiln, and shuttle kiln etc, and is the best replacement product. Typical characteristics are high intensity, non cinder dropping, non cracking and long life and easy replacement. Vacuum reaction sintered carbofrax torching snouts are especially adequate for industry kiln torching snouts using natural gas, liquefied gas, coal gas and diesel oil and so on in the trade of ceramics, chemical industry, glass, metallurgy etc. (below 1380°C)
Figure 2. Examples of silicon carbide burnner nozzles
Silicon Carbide Spray Nozzles
The SiSiC desulphating spray nozzle consist of mainly two series including more than ten varieties. They have been used as desulpating equipment in many fuel power plants and big boilers. The SiSiC desulphating spray nozzle have long life applications and have filled the gaps in domestic technologies which replace the imported parts.
Figure 3. Examples of silicon carbide spray nozzles
Application of Silicon Carbide in Power Electronics
The physical and electronic properties of silicon carbide make it the foremost semiconductor material for high temperature, high power, and high frequency electronic devices. The properties of silicon carbide make it a superior semiconducting material for power devices operating at high voltages. It possesses high thermal conductivity, can withstand high electric fields and current densities before breakdown, and experiences low leakage currents at high temperatures. Until recently, however, silicon carbide has been difficult to produce in economic quantities and with the quality necessary to meet the stringent specifications (e.g., micropipe density, diameter, conductivity, surface features) required by manufacturers of todays increasingly complex semiconductor devices.
Available wafer size (primarily 2-inch, most recently 3-inch) has been a limiting factor to the economic production of silicon carbide devices. Larger sized wafers allow for a greater throughput from the same semiconductor manufacturing process, enabling manufacturers to spread their fixed cost of production over a larger volume of finished product. For example, a 4-inch wafer has 78% more surface area than a 3-inch wafer, resulting in significant economies of scale.
Source: Shengli Abrasives
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