| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 105 === In this study, the laser surface texturing process was performed(dot and cross pattern) on the surface of tungsten carbide (WC-8Co), and explore the shear strength test under the condition filler metal can infiltrate the surface pattern and produce pinning effect, enhance the brazing shear strength of tungsten carbide(WC-8Co).
Experimental results show laser surface texturing process can increase the surface roughness of tungsten carbide(WC-8Co). filler metal can be successfully infiltrated tungsten carbide surface pattern after vacuum brazing process. Different holding temperature will reduce the hardness of the substrate, but improve the brazing properties of materials. In the shear strength test, it was found that the strength of the brazed interface had exceeded the shear strength of the material itself. Due to the mechanical properties of the tungsten carbide material itself, the effect of the laser surface pattern has no significant improvement. Where the maximum shear strength is 201.1 MPa when brazed at a holding temperature of 830 ℃.
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