Mohamed Daoush Walid, Saad Alkhuraiji Turki, Alshammri Abdulrahman Dohymish
Department of Chemistry, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Othman Ibn Affan Street, Al Riyadh 11623, Saudi Arabia.
Department of Production Technology, Faculty of Technology and Education, Helwan University, Saray-El Qoupa, El Sawah Street, Cairo 11281, Egypt.
Materials (Basel). 2021 Dec 20;14(24):7906. doi: 10.3390/ma14247906.
Polycrystalline cBN/copper composite abrasive particles were prepared by an electroless powder coating process. Ti metallization and tin/silver metallization techniques were used to improve the coating process by depositing an autocatalytic metallic layer on the surface of the cBN particles. Metallized, as well as un-metallized, cBN particles were further coated by copper using electroless deposition. Electroless copper coating of un-metallized and metallized cBN particles by 90 wt.% of copper were achieved. The surface morphology, the composition and the crystalline phase identifications of the metallized cBN particles, as well as the 10 wt.% cBN /copper composite powders, were investigated by field emission scanning electron microscopy, an energy-dispersive spectrometer and an X-ray diffractometer. The results show that the surface of the Ti metalized and tin/Ag-metallized cBN particles were covered by the nanosized Ti or Ag layer, respectively, which enhanced the deposition of the copper during the electroless deposition bath. The results also showed that the deposited layer on the metallized cBN particles was composed mainly of metallic copper. The produced 10 wt.% cBN/copper composite particles also underwent thermo-gravimetric analysis to investigate its stability at high temperature. It was revealed that the Ti-metallized cBN/copper composite powder has higher stability at 800 °C under the environmental conditions than the tin/silver-metallized and the un-metallized cBN/copper composite particles, respectively.
采用化学镀粉末涂层工艺制备了多晶立方氮化硼/铜复合磨粒。通过在立方氮化硼颗粒表面沉积自催化金属层，采用钛金属化和锡/银金属化技术来改进涂层工艺。对金属化和未金属化的立方氮化硼颗粒进一步采用化学沉积法涂覆铜。实现了对未金属化和金属化的立方氮化硼颗粒进行90 wt.%的铜化学镀。通过场发射扫描电子显微镜、能量色散光谱仪和X射线衍射仪对金属化立方氮化硼颗粒以及10 wt.%的立方氮化硼/铜复合粉末的表面形貌、成分和晶相进行了鉴定。结果表明，钛金属化和锡/银金属化的立方氮化硼颗粒表面分别覆盖有纳米级的钛或银层，这增强了化学镀浴过程中铜的沉积。结果还表明，金属化立方氮化硼颗粒上的沉积层主要由金属铜组成。对制备的10 wt.%的立方氮化硼/铜复合颗粒还进行了热重分析，以研究其在高温下的稳定性。结果表明，在环境条件下，钛金属化的立方氮化硼/铜复合粉末在800℃时分别比锡/银金属化和未金属化的立方氮化硼/铜复合颗粒具有更高的稳定性。
