Rotary-percussive drilling through steel reinforced concrete not only subjects cemented tungsten carbide drill bits to intensive abrasive wear but additionally induces significant microstructural changes in the near-surface regions. These include micro-, meso- and macroscopic cracking; comminution of the WC; delamination of WC-binder interfaces; binder depletion and pore formation; partial WC dissolution and rearrangement; surface decarburization; and the creation of secondary phases within the binder.

In this study, the wear phenomena in cemented carbide drill bits with different WC grain sizes (fine to extra coarse), binder contents (6–12 wt%) and binder types (Co, CoNi and Ni) have been documented, analysed and quantified. Noticeable differences between the various grades are evident.

A wide range of experimental variables have been investigated covering the large proportion of real-world cases encountered in the application of these drill bits on the construction site. This paper presents a broad overview highlighting how material choice influences wear.

对钢筋混凝土进行旋转冲击钻孔不仅会使硬质合金钻头遭受强烈的磨损，而且还会在近地表区域引起显着的微观结构变化。这些包括微观、中观和宏观开裂；WC的粉碎; WC-粘合剂界面分层；粘合剂耗尽和孔形成；部分WC溶解和重排；表面脱碳；以及在粘合剂中产生第二相。

在这项研究中，记录、分析和分析了不同 WC 粒度（细至超粗）、粘结剂含量（6-12 wt%）和粘结剂类型（Co、Co Ni 和 Ni）的硬质合金钻头的磨损现象。量化的。不同等级之间的显着差异是显而易见的。

已经研究了广泛的实验变量，涵盖了在施工现场应用这些钻头时遇到的大部分实际案例。本文提供了一个广泛的概述，强调了材料选择如何影响磨损。