Which process optimizations can reduce diamond tooling's reliance on cobalt?

In the previous article (Which Sagwell alloy powder systems can reduce the cost of cobalt-based matrix for diamond segments?), Sagwell mentioned that Alloy Powder reduces the cost of cobalt-based matrix of diamond tools. In this issue, we continue to explore what optimizations can be made in the process to reduce the dependence on cobalt.

As a strategic resource, the scarcity and price of cobalt have made diamond tool manufacturers urgently seek ways to replace cobalt. In addition to using alloy powder to replace part of the cobalt, it is also possible to optimize the process and improve the performance of the tool. Next, we will take the cutter head as an example for a detailed analysis, mainly including the following two points:

1. Low temperature activation sintering

Method: Add low-temperature sintering activator to promote matrix densification at 750-800℃
Effect: The cobalt content can be reduced to 20% while avoiding high-temperature graphitization of diamond.
Data: Sagwell's experiments show that after adding 0.5% of a certain activator, the sintering density of the cobalt-based matrix at 780°C reaches 98.5% (the original formula requires 850°C).

2. Gradient sintering and functional layer design
Structural design: High cobalt formula (Co 40%) is used only in the working layer of the cutter head (1-2mm on the surface), and the internal matrix layer is made of Iron-based alloy powder material.
Advantages: 50-60% reduction in overall cobalt usage while maintaining the same cutting performance (surface contact only).

In the next article, Sagwell will continue to explore how to innovate the matrix structure of diamond tools to reduce the cobalt content in the matrix.

Feel free to contact Sagwell for consultation.

Email: export@sagwell.com