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Improved Hardfacing for Drill Bits and Drilling Tools

机译：改进了用于钻头和钻孔工具的表面处理

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New flame spray hardfacing, DSH (DuraShell Steel Hardfacing, US patent pending), is developed to improve thermal conductivity, abrasion wear and erosion resistance for subterranean drilling application. The hardfacing materials consist of spherical cast WC/W_2C and Ni-Si-B alloy powders. The hardfacing compositions are tailored for flame spray and laser cladding processes. Typically, the hardfacing comprises hard spherical cast WC/W_2C particles uniformly distributed in a tough Ni-alloy matrix. The hardness of WC/W_2C exceeds 2100 Hv.3 and Ni alloy matrix varies from about 400 to 700 Hv.3. High stress and low stress abrasion resistances of these hardfacings were characterized and compared to the conventional cast WC/W_2C and Ni-Cr-Si-B-Fe hard coating. The increase in thermal, wear, and erosion resistances of DSH hardfacing improve the durability of PDC steel body bits and drilling tools and their cost effective performance. Several case studies of DSH hardfacings on drill bits are described.
机译：开发了新的火焰喷涂表面硬化层DSH（DuraShell钢表面硬化层，正在申请美国专利），以改善地下钻井应用的导热性，耐磨性和耐蚀性。堆焊材料由球形铸造WC / W_2C和Ni-Si-B合金粉末组成。该表面硬化组合物是为火焰喷涂和激光熔覆工艺量身定制的。通常，表面硬化包括均匀分布在坚韧的镍合金基体中的硬质球形铸造WC / W_2C颗粒。 WC / W_2C的硬度超过2100 Hv.3，Ni合金基体的硬度在400至700 Hv.3之间变化。对这些堆焊层的高应力和低应力耐磨性进行了表征，并与常规铸造WC / W_2C和Ni-Cr-Si-B-Fe硬质涂层进行了比较。 DSH堆焊的耐热性，耐磨性和耐蚀性的提高提高了PDC钢钻头和钻具的耐用性，并提高了其性价比。描述了一些在钻头上进行DSH堆焊的案例研究。

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