A novel binder jetting-based process for metal-bonded diamond grinding wheels and its microstructure formation
Conventional metal-bonded diamond abrasive tools with a uniform matrix cannot simultaneously achieve mechanical strength, heat dissipation, and chip clearance. Voids improve heat dissipation and chip clearance, but they compromise structural strength. This study presents a binder jetting‑based approach for fabricating tools with a built‑in strengthening skeleton. The proposed tool integrates a binder jetting-printed 316L skeleton, diamond grains, 316L filler, and infiltrated bronze into a single composite. Binder jetting offers exceptional design freedom and precise thermal control, making it well-suited for temperature-sensitive materials. The skeleton defines the abrasive zone and overall geometry, provides structural strength, and creates channels for heat dissipation and chip removal. After packing the abrasive zone with the diamond-filler mixture, the assembly undergoes bronze infiltration at moderate temperatures to consolidate the structure. In this study, dense and structured abrasive tools with 100% abrasive concentration and uniform diamond distribution in the metal matrix were produced. Interfacial reactions between diamond and the 316L filler led to minor surface degradation, thereby enhancing mechanical interlocking at the diamond-matrix interface. The three-point bending strength of dense specimens increased with bronze content, reaching 350–400 MPa. Grinding tests using SS304 as the workpiece confirmed the effectiveness of the proposed fabrication route.
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