Abstract
The effect of microstructure on the deformation mechanism and diamond-machinability of hot-pressed SiC during grinding process is studied. Similar to single-crystal SiC, amorphization, dislocation slip motion, and lattice distortion also occurs in the deformation process of multi-phase SiC ceramics. Other deformation mechanisms related to the microstructure of SiC ceramics, such as intergranular slip motion and grain fragmentation, have decisive influence on diamond-machinability of this material. When the average grain size is lower than 10 nm, there is a significant weakening of scratch hardness. Intergranular slip motions and grain fragmentation can effectively improve the processing efficiency. Therefore, in view of fabrication technology of SiC ceramics, reducing the grain size at nanoscale can improve the diamond-machinability of hot-pressed SiC and favorable for obtaining high-efficiency and high-precision surface processing effectiveness.
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