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Improved impact resistance of PDC and test of it in laboratory

机译:改善PDC的抗冲击性并在实验室进行测试

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A study is performed on a newly developed Polycrystalline Diamond Cutter(PDC) with improved impact resistance. Impact resistance of PDC is dependent on diamond grain size, binder content and property of the substrate. A crack might initiate in the substrate by the impact transferred from the diamond layer if substrate is not tough enough to absorb it. This failure is caused by the residual stress at the interface resulting from the difference of thermal expansion coefficient between diamond and substrate.This kind of failure could be reduced to some extent by optimizing the grain size of WC and content of Co in the substrate. PDC with much improved impact resistance is produced by also optimizing the diamond size and the content of binder phase in the layer.Drop-test with different conditions of energy and speed are carried out on the newly developed PDC and wear resistance test is done and the result is compared with that of previous PDC.It is found that the newly developed PDC shows 40% better impact resistance than previous PDC.
机译:对新开发的具有改进的抗冲击性的多晶金刚石刀具(PDC)进行了研究。 PDC的抗冲击性取决于金刚石晶粒尺寸,粘合剂含量和基材的性能。如果基材的韧性不足以吸收金刚石,则可能会由于金刚石层传递的冲击力而在基材中产生裂纹。这种破坏是由于金刚石和基体之间的热膨胀系数不同而在界面处产生的残余应力引起的。通过优化WC的晶粒尺寸和基体中Co的含量可以在某种程度上减少这种破坏。通过优化钻石的尺寸和层中粘合剂相的含量,可以生产出具有更高抗冲击性的PDC。在新开发的PDC上进行了不同能量和速度条件下的跌落测试,并进行了耐磨性测试,将结果与以前的PDC进行比较。发现新开发的PDC的抗冲击性比以前的PDC高40%。

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