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Influences of Sintering Temperature on Chemical Reaction and Microstructure in Al2O3–Ti(C0.7N0.3)–cBN Composite

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A system of Al2O3–Ti(C0.7N0.3)–cubic BN (cBN) composite was prepared by hot pressing in the temperature range from 1200 °C to 1700 °C for 20 min under the pressure of 35 MPa. The influences of sintering temperature on chemical reaction and microstructure in Al2O3–Ti(C0.7N0.3)–cBN composite were studied. Results show that Ti(C0.7N0.3) solid solution totally forms until the sintering temperature is higher than 1400 °C, and then decomposes to Ti(C x N1– x ) (0.7 < x < 1) as the sintering temperature exceeds 1500 °C. In addition, cBN particles keep their sharp edges until 1500 °C, while hexagonal BN and TiB2 are found at 1600 °C. As for the matrix, the grain size of Al2O3 is around 200 nm even when the sintering temperature reaches as hot as 1400 °C. Consequently, the appropriate sintering temperature for Al2O3–Ti(C0.7N0.3)–cBN is 1400 to 1500 °C and our work has laid a foundation for controlling the phases in Al2O3–Ti(C0.7N0.3)–cBN composite.
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Keywords: AL2O3; CBN; CHEMICAL REACTION; MICROSTRUCTURE; TI(C0.7N0.3)

Document Type: Research Article

Publication date: July 1, 2017

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  • Journal of Nanoelectronics and Optoelectronics (JNO) is an international and cross-disciplinary peer reviewed journal to consolidate emerging experimental and theoretical research activities in the areas of nanoscale electronic and optoelectronic materials and devices into a single and unique reference source. JNO aims to facilitate the dissemination of interdisciplinary research results in the inter-related and converging fields of nanoelectronics and optoelectronics.
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