Abrasion resistant active braze alloys for metal single layer technology

Abstract

The technology of brazing a single layer of abrasive on to the surface of a grinding tool, metal single layer (MSL) technology, provides an alternative way to make use of the superabrasives diamond and cubic boron nitride in machining ceramic materials or superalloys, cutting of construction materials, etc. For certain applications of MSL bonded wheels, the grinding or cutting process is very abrasive and the wear resistance of the braze alloy often dominates the wheel failure. The wear resistance of the braze alloy typically used for MSL can be improved by incorporating hard dispersoids. The present study examines the effect of particulate molybdenum, tungsten, SiC, WC, and TiC dispersoids on the wear resistance of Cu–Sn–Ti active braze alloys. Among these, TiC was identified as most effective in enhancing the abrasive resistance of the braze alloy. It was found that a braze alloy of 75 Cu–25Sn–12·5Ti–7·5Zr–10TiC–0·2C (by weight) exhibits high wear-resistance and excellent performance in cutting tests on green concrete.

Failure mechanisms and cutting characteristics of brazed single diamond grains

“…Only super-abrasives such as diamond and cubic boron nitride are suitable [4][5][6][7][8][9][10]. The preferred bonds are metallic which are achieved by brazing or electroplating due to their high-retention capabilities [6][7][8][10][11][12][13][14]. In case of electroplating, the retention is purely mechanical, i.e.…”

Influence of TiX (X=B2 or N) addition on the interfacial microstructure features of CBN grains and AgCuTi composite filler

“…For example, Ag-Cu based alloys containing various amount of Ti have been widely adopted as the filler for the brazing of CBN grains. The brazed joints using these fillers have low thermal resistance and could not work at temperatures above 500 ℃ [3][4][5][6] . Some researchers have attempted to develop Ni-Ti alloys instead of Ag-Cu-Ti alloy to join CBN, but the joining temperatures are usually required to be high up to 1350-1550 that is even higher ℃ than the molten temperatures of the tool matrix, i e, AISI 1045 steel.…”

Assessment of the Atomic Mobilities in fcc Cu-Fe and Cu-Ti Alloys

“…[1][2][3][4][5][6][7][8][9][10][11] Cu-Sn-Ti filler metals have been used widely to braze diamond grits onto a steel substrate due to their relatively high strength and erosion resistance when compared to Ag-Cu-based alloys, and their lower melting point when compared to Ni-based alloys. [7][8][9][10][11] The diffusion behavior between the filler metal and the diamond or the steel substrate affects the microstructure evolution and the formation of intermetallic compounds at the interfaces, which has significant influence on the performance of braze joints.…”