Tungsten alloy with special properties is a useful material in medical and weapon devices.Surface modification of ion technique is used to improve the surface hardness and wear resistance of tungsten alloy,where carbo...Tungsten alloy with special properties is a useful material in medical and weapon devices.Surface modification of ion technique is used to improve the surface hardness and wear resistance of tungsten alloy,where carbon films deposited with magnetron sputtering on the surface of tungsten alloy were bombarded by ion beam with different species.AES and XPS analyses for these speciment show that tungsten carbide and tungsten nitride were formed due to N-+ bombardment.Which is beneficial to the Surface hardness and wear resistance of tungsten alloy,but no carbide or no nitride as above with other ion species.Again,ion bombardness leads to mixing between the carbon and tungsten alloy hence improve the adhere of carbon film to the substrate.展开更多
Pure tungsten, oxide dispersion strengthened tungsten and carbide dispersion strengthened tungsten were fabricated by high-energy ball milling and spark plasma sintering process. In order to evaluate the properties of...Pure tungsten, oxide dispersion strengthened tungsten and carbide dispersion strengthened tungsten were fabricated by high-energy ball milling and spark plasma sintering process. In order to evaluate the properties of the tungsten alloys under transient high heat flues, four tungsten samples with different grain sizes were tested by high-intensity pulsed ion beam with a heat flux as high as 160 MW/（m^2·s^-1/2）. Compared with the commercial tungsten, the surface modification of the oxide dispersion strengthened tungsten by high-intensity pulsed ion beam is completely different. The oxide dispersion strengthened tungsten shows inferior thermal shock response due to the low melting point second phase of Ti and Y2O3, which results in the surface melting, boiling bubbles and cracking. While the carbide dispersion strengthened tungsten shows better thermal shock response than the commercial tungsten.展开更多
文摘Tungsten alloy with special properties is a useful material in medical and weapon devices.Surface modification of ion technique is used to improve the surface hardness and wear resistance of tungsten alloy,where carbon films deposited with magnetron sputtering on the surface of tungsten alloy were bombarded by ion beam with different species.AES and XPS analyses for these speciment show that tungsten carbide and tungsten nitride were formed due to N-+ bombardment.Which is beneficial to the Surface hardness and wear resistance of tungsten alloy,but no carbide or no nitride as above with other ion species.Again,ion bombardness leads to mixing between the carbon and tungsten alloy hence improve the adhere of carbon film to the substrate.
基金roject (50634060) supported by the National Natural Science Foundation of ChinaProject (2010GB109000) supported by the National Basic Research Program of China
文摘Pure tungsten, oxide dispersion strengthened tungsten and carbide dispersion strengthened tungsten were fabricated by high-energy ball milling and spark plasma sintering process. In order to evaluate the properties of the tungsten alloys under transient high heat flues, four tungsten samples with different grain sizes were tested by high-intensity pulsed ion beam with a heat flux as high as 160 MW/（m^2·s^-1/2）. Compared with the commercial tungsten, the surface modification of the oxide dispersion strengthened tungsten by high-intensity pulsed ion beam is completely different. The oxide dispersion strengthened tungsten shows inferior thermal shock response due to the low melting point second phase of Ti and Y2O3, which results in the surface melting, boiling bubbles and cracking. While the carbide dispersion strengthened tungsten shows better thermal shock response than the commercial tungsten.
