Graphite is an isomer of carbon. With the rapid development of the mould industry, graphite has gradually become the ideal material of choice for mould making with its good physical and chemical properties. Graphite is widely used in refractory materials, conductive materials, wear resistant materials, lubricants, high temperature sealing materials, corrosion resistant materials, heat insulation materials, adsorption materials, friction materials and radiation protection materials, which are widely used in metallurgy, petrochemical industry, mechanical industry, electronic industry, photovoltaic industry, nuclear industry and national defence.

The manufacture of solar cells involves six major processes: fleece making, diffusion, etching, coating, screen printing and sintering. One of these processes uses plasma-enhanced chemical vapour deposition to coat the front side of the wafer with silicon nitride to reduce solar reflection and to passivate the surface of the wafer.

When processing cells, the dimensional accuracy of one of the graphite workpieces is very high. The position and size of the workpiece affects the uniformity of the coating on the wafer, so a graphite workpiece with a smaller masking area and a smoother and more stable wafer can improve the photovoltaic conversion efficiency of the cell.

WSS PCD turning tools can perform precision turning of graphite workpieces with a diameter of approximately 15 mm, forming the shape of the workpiece in one pass with dimensional tolerances between 0.01 mm, and can meet different chamfering angles for different types of workpieces. Under suitable machine conditions and processing parameters, the machining life can reach 30-40,000 pieces, which is twice as long as an imported tool brand. In addition, PCD turning tools are a more ideal solution for machining graphite materials with higher efficiency and reduced time costs compared to other material inserts.

Graphite workpieces machined with WSS PCD tools are well suited to fixing silicon wafers and minimising blocking areas to guarantee the photovoltaic efficiency of your cells, further enhancing the advantages of your product.