Abstract�In order to explore the application of brazing technology in the manufacture of diamond bit.fabrication technology of brazed diamond bit was introduced in this paper on the base of analyzing advantages and disadvantages of brazing,electroplating and hot-pressing method respectively.Three types of thin wall diamond bits were manufactured with Ni-Cr brazing filler.�A laboratory drilling test was carried out on those new monolayer diamond bits.The drilling materials were concrete,reinforced concrete and granite.The tesI results showed that sintering temperature,composition and content of solder additive played an important role in the performances of diamond bit;A diamond bit had the best performance when it was sintered at 9 80 oC:some additional low melting point metals such as Cu alloy can improve the wettabilitv between diamond and matrix obviously.The drilling test results indicated that brazed diamond bit had superiorities of good diamond exposure,better sharpness and longer lifespan compared with the two conventional kinds.and it meant this brazing technology used in the development and application of diamond bit had important significance.

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