This article mainly studied the machining efficiency and service life of a brazed diamond tool for drilling silicon carbide (SiC). Firstly, the influence of process parameters (spindle speed [ss], axial pressure [ap], feed rate [fr]) on the drilling efficiency was researched. Then, the orthogonal analysis was carried out to study the influence of tool structural parameters (wall thickness of tools [wtt], diamond grit size [dgs], working layer thickness [wlt], and outer diameter of tools [odt]) on the drilling efficiency and tool life. Eventually the effects of solder composition on the drilling performance were investigated. The results show the following: (1) the optimal drilling efficiency can be obtained under the condition of ss of 83π rad/s, ap of 800 N, and fr of 4/100π mm/rad. (2) The influence degree of tool structure on the drilling performance is wtt > dgs > wlt > odt; the optimal tool structural parameters are wtt of 1 mm, dgs of 250 μm, odt of 10 mm, and wlt of 0.8 mm. (3) For SiC ceramics prepared by hot pressing and hot isostatic pressure sintering, diamond tools with nickel-chromium alloy solder should be chosen; whereas for SiC ceramics prepared by pressure-free and reactive sintering, diamond tools with copper-based solder should be chosen.
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