Boron carbide (B4C) is gray-black and is a very hard artificial material. Its Mohs hardness is 9.3 and its microhardness is 5500~6700kg/mm2, second only to diamond and cubic boron nitride. The crystal structure of boron carbide is hexagonal crystal. Density is 2.52g/cm3. The melting point is 2450°C. When the temperature is higher than 2800°C, it decomposes and volatilizes rapidly. Its linear expansion coefficient is 4.5×10-6/℃ (20~1000℃), its thermal conductivity is 121.42 (100℃) W (m·K), 62.80 (700℃) W/(m·K), and its resistivity It is 0.44 (20℃)Ω·cm and 0.02 (500℃)Ω·cm.
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Thermocouples are widely used to measure, monitor, and control the temperature inside a vacuum, pressure, or controlled atmosphere chamber.
The automotive sensors market is dominated by Robert Bosch GmbH, Continental AG, DENSO Corporation, Infineon Technologies AG, Sensata Technologies, Allegro Microsystems Inc., Analog Devices Inc., ELMOS Semiconductor SE, Aptiv plc, NXP Semiconductors N.V., STMicroelectronics N.V., CTS Corporation, Texas Instruments Incorporated, TE Connectivity Ltd., ZF Friedrichshafen, Magna International.
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