烧结方式对金刚石微粉氧化、形貌和砂轮磨削性能的影响

研究了烧结前金刚石微粉以及经空气气氛烧结、氮气气氛烧结和陶瓷结合剂包裹空气气氛烧结的金刚石微粉形貌和氧含量,并以这些微粉为原料制备了陶瓷金刚石砂轮,研究了微粉状态对磨削性能的影响。结果表明:烧结方式对金刚石微粉氧含量和性能有较大影响。金刚石微粉在空气气氛中烧结后重量减少5.2%,总氧含量、表面氧含量和点氧含量分别为0.078%、4.84%和2.00%,均大幅度高于其他两种烧结方式。此外,由空气气氛、氮气气氛和陶瓷结合剂包裹烧结的金刚石微粉制备的砂轮的磨耗体积比只有用未经烧结金刚石微粉制备砂轮的59.6%、89.6%和67.6%。

Effects of sintering process on oxidation and morphology of diamond powders and grinding performance of diamond wheel

The morphologies and oxygen contents of diamond micropowders before and after sintering in air atmosphere,nitrogen atmosphere,and in air atmosphere with ceramic bonder were investigated.The effects of micropowder on the grinding performance of ceramic diamond wheel were studied.The results showed that oxygen content and performance of diamond micropowders were significantly affected by sintering process.The weight of diamond micropowders reduced by 5.2% after sintered in air atmosphere.The total,surface,and point oxygen contents of the diamond micropowders were 0.078%,4.84%,and 2.00%,respectively,which were greatly higher than those sintered by the other two sintering processes.The grinding abrasion volume ratios for the wheel made from the diamond micropowders sintered in air atmosphere,nitrogen atmosphere, and air atmosphere with ceramic bonder were only 59.6%,89.6% and 67.6% of that for the wheel made from the powders without sintering,respectively.