Effects of Silicon Powder Size on the Processing of Reaction-Bonded Silicon Nitride
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Reaction-bonded silicon nitride (RBSN), RBSN, Nitridation, Mechanical propertiesบทคัดย่อ
The effects of silicon powder size on the processing of reaction-bonded silicon nitride (RBSN) were investigated by using three silicon powders of 3, 6 and 12 mm in average size. The procedure for processing of RBSN body was as follows: compacting the silicon powder with uniaxial press at 72 MPa and then cold isostatic press (CIP) at 300 MPa; pre-sintering the green compact at 1200 oC in argon atmosphere for 3 hrs; then nitriding the preform body at 1500 oC in nitrogen atmosphere for 3 hrs. The physical and mechanical properties were measured. From the results, bulk density, hardness, young’s modulus and flexural strength are increased with decreasing the silicon powder size. The mechanical properties vary with density, % porosity and a-Si3N4 content.
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ลิขสิทธิ์ (c) 2005 The Journal of Metals, Materials and Minerals (JMMM)
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