PDF(Pubmed)
Abstract：
Research into new composites utilizing cubic boron nitride (PcBN) shows promise for enhancing cutting tool performance. The unique properties of these materials stem from the addition of microfibers made of refractory compounds to their structure. This study looks at developing two-layer composites based on cBN group BL, reinforced with SiCw and Al2O3w microfibers. The goal is to improve tool stability when cutting hardened steels with impact loads. PcBN composite samples were made by sintering a mixture of cBN powder with bundles and microfibers under 7.7 GPa pressure. Bond material selection was based on analyzing the relationship between Poisson\'s ratio (η) and plasticity parameter (G/B). The density, Young\'s modulus, Poisson\'s ratio, and hardness of the composites were determined, and the microstructure of samples with TiCN bond was studied. Tool-life tests were conducted on two-layer cutting inserts made of PcBN reinforced with SiCw and Al2O3w microfibers during the machining of hardened KhVG steel (HRC 55) under impact loads at cutting speeds of 100 and 200 m/min.
摘要：
对利用立方氮化硼（PcBN）的新型复合材料的研究显示出提高切削刀具性能的希望。这些材料的独特性能源于在其结构中添加了由耐火化合物制成的微纤维。本研究着眼于开发基于cBN组BL的双层复合材料，用SiCw和Al2O3w微纤维增强。目标是在冲击载荷下切削硬化钢时提高刀具稳定性。通过在7.7GPa压力下烧结cBN粉末与束和微纤维的混合物来制备PcBN复合材料样品。在分析泊松比(η)与塑性参数(G/B)关系的基础上选择了粘结材料。密度，杨氏模量,泊松比，并测定了复合材料的硬度，研究了含TiCN键的样品的微观结构。在加工硬化的KhVG钢（HRC55）在冲击载荷下以100和200m/min的切削速度加工期间，对由SiCw和Al2O3w微纤维增强的PcBN制成的两层切削刀片进行了刀具寿命测试。
