Bond Materials Used In the Transition Layer of Diamond Segments
A diamond blade consists of a steel core and some diamond segments. In many cases, a diamond segment (especially for those diamond segments for laser welding) includes not only a working layer (containing diamonds for cutting), but also a transition layer. The transition layer has no diamonds, and is a pure bond layer which connects the working layer to the steel core of a diamond blade.
The transition layer should have good weldability. For if not, the diamond segment will fall from the steel core when receiving high alternating forces in cutting, and this may cause safety issues.
The bond materials used in the transition layer normally do not contain low melting-point metals, for example, Sn and Zn, for under high temperatures, these metals tend to be evaporated and gasified, and then produce air-holes. The transition layer often adopts Cu, Ni and some other alloy materials.
WC (tungsten carbide) can improve the wear resistance of the weld and the transition layer, but if its content is too high, welding defects such as holes and slag will be caused, and when this is serious, the transition layer may break. To solve this problem, a few Mn and Cr can be added. This will not only generate solid-solution-strengthening and increase wear resistance, but also reduce air-holes.
The compositions of the working layer and the transition layer should not be very different. Otherwise, the junction of the two layers will tend to break because of uneven heat and forces they receive when the diamond blade is sawing.
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