Coating of diamond particles for production of metal matrix composites

Abstract

In an effort to produce more cost effective diamond to metal interfaces, mono-and polycrystalline diamond powders were coated with nickel alloys using electroless chemical deposition techniques. Ni-P and Ni-B coatings were deposited using an acidic and an alkaline solution respectively. These deposition procedures were preceded by a thermal surface functionalisation step and a sensitisation step using a Pd-Sn colloidal solution. Imaging by SEM and chemical analyses show uniform coverage of the coating, independent of diamond's crystalline planes, and having thicknesses consistently ,200 nm.

Wear Resistance of (Diamond-Ni)-Ti6Al4V Gradient Materials Prepared by Combined Selective Laser Melting and Spark Plasma Sintering Techniques

“…7 composed of pure titanium alloy had better resistance than No. 3 An important outcome of this study was to demonstrate the effect of diamond particle size, the thickness of the Ni coating, and the effect of metallic lattice structure on wear resistance. This was proved by XRD and by SEM images that diamond particles are present after the SPS process and after wear testing (Figures 5, 6, and 7).…”

“…Synthetic polycrystalline diamond (PCD) is cost-effective and advantageous powder that can be coated by metals like cobalt, nickel, titanium, and copper and is usually used in grinding, polishing, and boring applications with sufficient cooling and without impacts. Diamond-containing metal matrix composites (MMCs) are made with the help of chemical/physical vapor deposition (CVD/PVD) techniques and they are considered because of their high thermal conductivity and mechanical properties [3]. Selective laser melting/sintering (SLM/SLS) is one of the new additive manufacturing techniques that is applied for production of complex metal shapes, lattice structures, and rapid prototyping.…”

“…A similar effect can be studied with the help of samples No. 3 Table 1). In order to provide similar diamond particle content in composite materials of No.…”

Metal Matrix Composite in Heat Sink Application: Reinforcement, Processing, and Properties

“…Copper is the most widely used matrix material for heat sink applications due to its high thermal conductivity (400 Wm −1 K −1 ), high melting temperature, and good weldability [ 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 ]. To overcome the high coefficient of thermal expansion of copper, different reinforcements have been incorporated in the copper matrix, namely diamond particles [ 36 , 38 , 39 , 40 , 41 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 ], graphite (particles, fibers, or foam) [ 44 , 68 , 69 , 70 ], carbon fibers (CFs) [ 39 , 54 , 71 , 72 , 73 ], carbon nanotubes (CNTs) […”

“…The secondary approach to improve the interfacial bond between diamond particles and the copper matrix is the diamond surface modification. The carbide-forming elements, such as B, Ti, W, Cr, Mo, or Si, are deposited on the surface of diamond by magnetron sputtering [ 45 , 49 , 60 , 63 ], the molten salt method [ 40 , 41 , 48 , 53 , 67 ], the diffusion method [ 36 , 58 , 59 ], vacuum evaporation deposition [ 91 ], and electroless chemical deposition [ 52 ]. This coating serves as an intermediate layer that not only strengthens the interface between diamond and copper but also mitigates the degree of graphitization of diamond particles at elevated temperatures [ 53 ].…”