Abstract
The process of preparing metallic matrix diamond tool bits by microwave pressureless sintering (MPS) was exclusively studied in this paper. The effects of the sintering temperature, the cold pressure, and the holding time on the mechanical properties of the bit were determined by using the response surface methodology (RSM) with Box-Behnken Design (BBD). In addition, with RSM, the second-order polynomial equation of mechanical properties was obtained. The solutions were well matched with the experimental values. This indicates that major variations in mechanical properties of the sintered sample could be predicted by the models, which shows that the applied model is accurate. Conventional pressureless sintering (CPS) experiments were also conducted to make a comparison. The experimental results showed that the MPS can enhance the mechanical properties of sintered samples. A possible MPS mechanism is proposed in this work after analyzing all the experimental results.
Highlights
Metallic matrix diamond tools are widely used in machining, construction, and geological drilling industries due to their high processability, good wear resistance, high hardness, and high thermal conductivity [1,2,3]
The average values of the relative density, the flexural strength, and the abrasive ratio of the sintered sample obtained by the experiment were
20.7 flexural strength, and the abrasive ratio of the sintered sample obtained by the experiment were
Summary
Li Yang 1,2,3,4 , Liang Wang 5 , Jiyun Gao 6 , Shenghui Guo 1,2,3,4, * , Xiaolei Ye 1,2,3, *, Sivasankar Koppala 1,4 , Tu Hu 1,3,4 , Ming Hou 1,2,3 and Longtao Hu 3,4. State International Joint Research Center of Advanced Technology for Superhard Materials, Kunming. National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming. Received: 15 September 2018; Accepted: 24 October 2018; Published: 5 November 2018
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