Failure of stainless steels in contact with tin-phosphorus bronze

Conclusions

• 1. Sintering of bronze filters is accompanied by complex interactions of the mold material (steel 12Kh18N9T) with the filter material (bronze Br0F10-1), the most important of which are oxidation of the surface of the mold and interdiffusion of the components.

• 2. Oxidation of steel 12Kh18N9T under these sintering conditions is accompanied by oxidation of chromium, which leads to impoverishment of the surface in chromium and the development of a zone of internal oxidation.

• 3. The diffusional penetration of the filter components — copper, tin, and phosphorus — into the mold in the process of sintering is accompanied by alloying of these elements with the basic mold material (iron) and leads to further reduction of its oxidation resistance. Especially harmful is simultaneous alloying with copper and phosphorus.