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Development and application of silicon carbide ceramics

Development and application of silicon carbide ceramics

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  • Time of issue:2020-09-30
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(Summary description)The method of industrial production of silicon carbide is to mix quartz, carbon (coal char), wood chips and salt, and heat it to 2200~2500℃ in an electric furnace. The difference between silicon carbide ceramics and many ceramics is that it can conduct electricity at room temperature and is resistant to high temperatures.

Development and application of silicon carbide ceramics

(Summary description)The method of industrial production of silicon carbide is to mix quartz, carbon (coal char), wood chips and salt, and heat it to 2200~2500℃ in an electric furnace. The difference between silicon carbide ceramics and many ceramics is that it can conduct electricity at room temperature and is resistant to high temperatures.

  • Categories:Company News
  • Author:
  • Origin:
  • Time of issue:2020-09-30
  • Views:0
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The method of industrial production of silicon carbide is to mix quartz, carbon (coal char), wood chips and salt, and heat it to 2200~2500℃ in an electric furnace. The difference between silicon carbide ceramics and many ceramics is that it can conduct electricity at room temperature and is resistant to high temperatures. It is a good heating element. Electric heating rods made of silicon carbide are called silicon carbide rods, which can withstand high temperatures of 1450°C in the air; silicon carbide rods made of good quality recrystallization can even withstand high temperatures of 1600°C, much higher than metal heating elements (except Platinum, rhodium and other precious metals), this is because it will oxidize in high-temperature air to form a dense silicon oxide film, which acts as a barrier to the air and greatly slows down the further oxidation of the inner silicon carbide, so that it can Work at high temperatures. High-density silicon carbide ceramics close to the theoretical density can be prepared by hot pressing. Its bending strength can reach 500-600 MPa even at a high temperature of about 1400 ℃, while other ceramic materials will have sharp strength after 1200 ℃ decline. Therefore, silicon carbide is the strongest material in high-temperature air.

To improve the efficiency of high-temperature gas turbine engines, the operating temperature must be increased. The key to solving the problem is to find structural materials that can withstand high temperatures, especially the blade materials inside the engine. Silicon carbide ceramic has sufficient strength at high temperatures, and has good oxidation resistance and thermal shock resistance. These excellent qualities make it extremely suitable for use as high-temperature structural materials. Many scientists consider it and silicon nitride ceramics to be the most promising candidate materials for high temperature gas turbine engine blades that operate at 1200 to 1400°C. Fountyl New Material produces high-end microporous ceramic suction cups porous ceramic.

The thermal conductivity of silicon carbide ceramics is second only to that of beryllium oxide ceramics. Using this characteristic, it can be used as an excellent heat exchanger material. The heat exchanger heated by the focus of sunlight in solar power generation equipment has an operating temperature of 1000 to 1100°C. Silicon carbide ceramics with high thermal conductivity are very suitable for this type of heat exchanger material. From the test situation, silicon carbide ceramics The heat exchanger is in good working condition. In addition, silicon carbide ceramics can be used as an encapsulating material for nuclear fuel in nuclear reactors, as well as nozzles for rocket nozzles and bulletproof supplies for pilots.

In addition, in order to improve the cutting performance of cutting tools, since the 20th century, tool materials have undergone two development processes of high-speed steel and cemented carbide, and are now entering the stage of great development of ceramic tools. New ceramics have attracted the attention of the high-speed cutting tool industry in the early 20th century because of their high temperature resistance and wear-resistant characteristics. Ceramic tools have high hardness and high wear resistance, so they have become an ideal material for manufacturing cutting tools. At present, the materials used to manufacture ceramic cutting tools mainly include alumina, alumina-titanium carbide, alumina-titanium nitride-titanium carbide-tungsten carbide, alumina-tungsten carbide-chromium, boron nitride and silicon nitride. Tools made of this type of material can work without coolant, and have the advantages of high cutting speed and long life compared to cemented carbide. At present, European and American countries have widely used ceramic materials for drills, taps and hobs; the former Soviet Union has determined more than 7,000 varieties of alloy tools to increase the working speed and service life of turning tools by spraying surface ceramic coating.

In addition to being used as cutting tools, ceramics can also be used as wear-resistant parts on various machines by their wear-resistant and corrosion-resistant properties. For example, using special ceramics to make agricultural water pumps, mortar pumps, chemical pumps with corrosive liquids, and dust-resistant fans in wear-resistant and corrosion-resistant parts or sealing rings have achieved good practical results. In addition, high-purity alumina (corundum) can be used to make metal wire drawing dies, especially hot wire drawing at high temperatures, showing the superiority of ceramics; in industrial ceramics, ball milling cylinders and grinding balls, and sandblasting nozzles for rust removal on metal surfaces, Nozzles for spraying pesticides, etc. In short, wherever wear resistance and corrosion resistance are required, special ceramics will almost always be seen.

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Committed to R&D, production and sales of high-performance silicon carbide products
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Fang Liang
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Committed to R&D, production and sales of high-performance silicon carbide products
Tel: 0086-0536-7653807
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E-mail:kefu@wf-hm.com​
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