Does high-purity iron powder for diamond tools have a significant effect on the iron-based alloy powder matrix?
In this article, Sagwell will explore the issue of "the influence of high-purity iron powder oniron-based alloy powder matrix" from the perspective of diamond tool performance.
Purity is one of the key indicators of ultrafine iron powder, which usually refers to the content of the main element Fe, and limits the content of impurity elements such as O, C, S, P, Si, Al, and Mn.
Sagwell technicians have recently conducted several experiments and found that the higher the purity of high-purity iron powder, the more significant the improvement in the performance of iron-based alloy powder matrix tools, which is mainly reflected in the following aspects:
- Significantly improve carcass strength and toughness:
Reduce brittle inclusions: Impurity elements (such as O, S, P) tend to aggregate at grain boundaries or form brittle compounds (such as FeO, FeS, Fe₃P). These brittle phases may become crack sources or reduce grain boundary strength, resulting in decreased overall strength and toughness of the matrix. High-purity iron powder can minimize these harmful inclusions, making the matrix purer and more uniform, thereby achieving higher strength and better toughness.
Improve sinterability: Impurities (especially surface oxides) will hinder direct metal contact and atomic diffusion between iron powder particles, reducing the sintering driving force and densification degree. High-purity iron powder can make the sintering activity of the iron-based alloy powder matrix higher, forming a denser and more firmly bonded matrix structure, significantly improving the strength, hardness and wear resistance of the matrix itself.
- Enhance the holding power of the matrix on diamonds:
Sagwell's experiments also concluded that high-purity iron powder can reduce interface weakening: impurity elements (especially Si, Al, O) may gather at the matrix/diamond interface, forming a weak interface layer or hindering beneficial interface reactions (such as moderate Fe-C reaction to form carbides to enhance bonding). High-purity iron powder provides a "cleaner" interface, which is conducive to the formation of stronger and more direct mechanical engagement and possible chemical bonding, thereby significantly improving the matrix's grip on diamond. This is the key to preventing diamond particles from falling off prematurely.
Improved wettability: Impurities may reduce the wettability of the molten matrix (or high temperature solid) to the diamond surface. High purity iron powder usually has more intrinsic surface properties, which is conducive to improving wettability and enhancing bonding.
In the following articles, Sagwell will also explore the impact of high-purity iron powder on iron-based alloy powder matrix cutting tools from the perspectives of improving performance and production processes. Please stay tuned.
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