Enhancing the sharpness of diamond tools is a core performance attribute that most customers strive to improve. But what specific measures can be taken to achieve this? Technicians from Sagwell recently shared two key focal points.
1. Diamond Interface Treatment
This key point encompasses two specific aspects:
Diamond coating: Electroless nickel (Ni) plating or titanium (Ti) electroplating (with a film thickness of 0.5–2 μm) is adopted. This method can improve wettability, reduce interface embrittlement, and intentionally enrich the soft phase in the coating and its adjacent areas, thereby forming a preferential wear zone.
Powder mixing sequence: Special attention should be paid to the order of powder mixing. First, mix the coated diamond with soft-phase-containing micro-powder (including Cu/Sn), and then blend the mixture with the main powder. This sequence facilitates the enrichment of the soft phase around the diamond particles.
2. Adjustment of Diamond Tool Sintering Process
For Fe–Cu–Ni based matrices, the following sintering process adjustments are recommended:
Sintering temperature: The suggested temperature range is 850–930°C. If the proportion of ultra-fine Fe is high, the temperature can be appropriately lowered to 830–880°C. Additionally, shortening the holding time helps reduce the risk of carbon diffusion and graphitization.
Holding time: It is recommended to set the holding time between 10–45 minutes, which depends on the target density. A shorter holding time retains pores in the matrix, while a longer holding time improves the density.
Heating rate: Under vacuum or protective atmosphere, the heating rate should be 5–15°C/min. A slower rate (≤2–5°C/min) is required during the degreasing stage.
Cooling process: Slow cooling should be carried out under protective gas or a small amount of H₂ to prevent oxidation.
The above insights are professional recommendations from Sagwell technicians regarding the enhancement of diamond tool sharpness.
Please feel free to consult for more details.
Email: [email protected]
