Is the Short Service Life of Diamond Wire Saw Beads Caused by the Manufacturing Process?

Many people attribute the short lifespan of diamond beads to the sintering process: low density from pressureless sintering leads to short life, while high density from hot-press sintering ensures long life. However, in practice, many hot-pressed beads suffer early failure, and some optimized pressureless beads deliver exceptional service life. This indicates that the sintering process is merely a method. The key determinant is whether the matrix can steadily hold diamond particles until they are fully utilized.

The failure of this holding force is the real cause of short bead life, regardless of the manufacturing process.

Studies on short-life beads reveal two critical mismatches between the matrix material and diamond:

Residual pores in pressureless sintered products or micro-segregation in improperly formulated hot-pressed matrices create structural weaknesses. Under high-speed granite cutting, repeated impact stresses concentrate in these zones. Diamonds, like foundations in loose soil, are pulled out or fractured entirely. This premature detachment is the most common failure mode, unrelated to sintering method but closely linked to the matrix structural integrity.

Diamond consists of carbon, while the matrix is a metal alloy. A moderate chemical interfacial bond defines the maximum holding capacity. If the matrix (e.g., poorly designed Iron-based systems) has low wettability with diamond, the connection remains mechanical rather than metallurgical. Under high shear stress, the interface cracks prematurely: diamonds either fail to shed when blunted (losing self-sharpening ability) or detach when sharp, drastically reducing service life.