用于金刚石工具的含强碳化物形成元素Ti的铜基胎体复合粉末的制备及应用研究

Preparation and Application of Copper Matrix Composite Powders Containing Carbide Forming Element Ti for Producing Diamond Tools

采用扩散烧结法制备了含强碳化物形成元素哪的铜基金刚石工具胎体新型复合粉末CuSnl3Ti7。采用扫描电子显微镜（SEM）、X射线衍射（XRD）、差热法等对粉末的性能进行了研究。通过研究铜钛合金氩气保护球磨工艺，优化了钛元素加入方式；研究了3种元素扩散工艺，并将此种粉末与雾化法制备的CuSnl3Ti7粉末烧结应用性能进行了对比研究。试验结果表明：超细铜钛合金粉末制备的较佳工艺条件为：球磨时间为72h，球料比为2：1，并在球磨过程中加入添加剂硬脂酸，以避免超细粉团聚；530℃，保温时间1h50min，是较理想的扩散烧结工艺；750和850℃之间，扩散型CuSnl3Ti7复合粉末的烧结的胎体材料的密度、冲击韧性和硬度综合性能较好；较雾化CuSnl3Ti7粉末成分稳定，综合性能优良。

The CuSnl3Ti7 copper matrix composite containing carbide forming element Ti for matrix of diamond tools were prepared by the diffusion process. Properties of the powders were studied by scanning electron microscopy （SEM） , X-ray diffraction （XRD） , differential thermal analysis. The addition method of Ti was optimized by studying the milling process of Cu-Ti alloys under the protection of argon. Three element diffusion processes were studied, and the sintering application performances of the CnSnl3Ti7 powders prepared by diffusion, which were compared with CuSnl3Ti7 powders prepared by atomization. The results showed the proper process of ultrafine copper-titanium alloy powders was milling 72 h, and the ratio of balls and powder is 2： 1. Stearie acid should be added to avoid the agglomeration of ultra-fine powder. The better diffusion-sintering process is 530 ℃ and 1 h 50 min. When the temperatm＇e is between 750 and 850 ℃ , the sintering body of the CuSnl3Ti7 powders prepared by diffusion had more stable and more excellent overall performances than the CuSnl3Ti7 powders prepared by atomization, which include density, hardness and impact toughness.