Pressure infiltration of boron nitride preforms with molten aluminum |
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| Authors: | HSL Sithebe D McLachlan I Sigalas M Herrmann |
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| Affiliation: | 1. School of Physics, University of Witwatersrand, Private Bag x3, Wits, 2050 Johannesburg, South Africa;2. School of Chemical and Metallurgical Engineering, University of Witwatersrand, Private Bag x3, Wits, 2050 Johannesburg, South Africa;3. Fraunhofer Institute of Ceramic Technologies and Systems, Winterbergstrasse 28, D-01277 Dresden, Germany |
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| Abstract: | The infiltration of compacted cubic BN (cBN) with molten aluminum has been investigated as a potential route for a cheap and easy method of manufacturing cBN/metal composites. CBN compacts have been infiltrated with molten Al at a temperature between 670 and 800 °C and pressure of 15 MPa in vacuum. At these temperatures no pronounced interactions between hexagonal and cubic BN with Al was observed, allowing the complete infiltration of cBN with 12 μm mean grain size. After infiltration at 800 °C, the temperature was increased without pressure to convert aluminum into borides and AlN. The hardness of the resulting materials depends on the content of hexagonal, cubic BN and the rate of conversion of Al into borides and AlN. The infiltration height of less than 1 mm obtained from infiltrating the 3 μm cBN powder green compacts gave a hardness of 22.0 ± 0.6 GPa after heat treatment. |
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| Keywords: | A Sintering C Hardness E Wear parts Cubic boron nitride |
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