Pressure infiltration of boron nitride preforms with molten aluminum
| Autor: | H.S.L. Sithebe, Iakovos Sigalas, David S. McLachlan, Mathias Herrmann |
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| Přispěvatelé: | Publica |
| Rok vydání: | 2008 |
| Předmět: |
Materials science
Hexagonal crystal system Process Chemistry and Technology chemistry.chemical_element Mineralogy Infiltration (HVAC) Grain size Surfaces Coatings and Films Electronic Optical and Magnetic Materials Metal chemistry.chemical_compound chemistry Aluminium Boron nitride visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Composite material |
| Zdroj: | Ceramics International. 34:1367-1371 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2007.03.033 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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