Preparation And Properties Of Composite Electroplating Fe-matrix Bonding Diamond Segment

In this topic, we prepared the plating solution，and designed the reasonable process. Firstof all,，Ni coating was formed on the diamond surface by the electroless plating technique,then nanoparticle was dispersed evenly in the plating solution, finally, diamond plating wasprepared in the chemical plating Ni plating-nanoparticle composite coating by the barrelplating device. An orthogonal experimental was designed, iron-based formula was optimized,composite electroplating iron-based diamond segment was fabricated for performance test.We study the effect of different chemical composition on mechanical properties of iron-basedmaterials. The microstructure and composition of coating diamond were studied by SEM andEDS. Fracture morphology of iron-based diamond segment was analyzed deeply.The coating thickness was calculated by coating thickness calculation formula, when theratio of weight addition of Ni-SiC composite plating diamond was25.0%, the coatingthickness reached to10.2μm. In a certain extent, the addition of nanoparticles have played animportant role in refining grain size.The orthogonal experiment results were analyzed, Different chemical composition onmechanical properties of iron-based was investigated. Formula one, six, eight were optimized.The flexural strength of six matrix formula was633MPa, the impact toughness was4.04J/cm², hardness was101.3（HRB）.With the addition of diamond into the composites, the flexural strength of formula one,six and eight was reduced respectively. The results show that formula one unplated iron-baseddiamond segment had reduced most obviously by43.9%,. Formula sixplated Ni-nanometerSiC iron-based diamond segment have dropped14.5%.The wear resistance of iron-based diamond segment was tested, the composite platednanometer Al₂O₃, Si₃N₄, SiC and Ti plating iron-based diamond segment had higher wearresistance than unplated iron-based diamond segment, only the wear resistance of Ni platediron-based diamond segment had lowed slightly. The abrasion ratio of composite platedNi-nano Al₂O₃Fe-matrix bonding diamond segment reached700.The EDS was adopted to analyze diamond and diamond peeling off pits on the fractureof composite plating Ni-nanometer SiC diamond iron-based segment. Binder elements suchas Cu, Fe, Ni and so on was found in diamond surface. And Si element of the coating was alsofound in the diamond drop pit. The results demonstrates that in sintering process the bondelements have penetrated the coating. As a mid-tier, the coating played a bridge role inenhancing the bonding strength of bond and the diamond, and the coating maked bond to holdthe diamond more effectively.