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首页> 外文期刊>Procedia CIRP >Investigation on the grinding characteristics of binderless nanocrystalline cubic boron nitride (BNNC) as cutting material for the machining of hardened steels and superalloys
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Investigation on the grinding characteristics of binderless nanocrystalline cubic boron nitride (BNNC) as cutting material for the machining of hardened steels and superalloys

机译：无粘结剂纳米晶立方氮化硼（BNNC）作为加工淬硬钢和高温合金的切削材料的磨削特性研究

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The direct synthesis of a binderless nanocrystalline cubic boron nitride (BNNC) from hexagonal boron nitride (hBN) has been developed by using a high-pressure / high-temperature process (HP/HT) with temperatures from 1400 °C - 2200 °C and pressures from 10 GPa - 20 GPa, the resulting BNNC compacts have a high hardness of more than 50 GPa as determined by Knoop-Indentation. A phase content of up to 97 % cBN could be determined by X-ray diffraction (XRD). The average crystallite size of the material is smaller than 100 nm and therefore significantly smaller than the crystallite size of conventional polycrystalline cubic boron nitride (PcBN) cutting materials. Compared to established PcBN cutting materials, the BNNC has an increased hardness and hot hardness and improved temperature stability. Utilization BNNC-based tools with defined cutting edge could provide an excellent alternative for the enhancement of the process limits for the machining of hardened steels and superalloys. This conference contribution will present the latest developments and challenges in the HP/HT direct synthesis of binderless nanocrystalline boron nitride (BNNC) as well as the investigation of its grinding characteristics for the application as cutting insert.
机译：通过使用高压/高温工艺（HP / HT）在1400°C-2200°C和1200°C到200°C的温度范围内，从六方氮化硼（hBN）直接合成无粘合剂的纳米晶立方氮化硼（BNNC）。在10 GPa-20 GPa的压力下，所得的BNNC压块具有由努氏压痕确定的超过50 GPa的高硬度。可以通过X射线衍射（XRD）确定高达97％cBN的相含量。该材料的平均微晶尺寸小于100 nm，因此大大小于常规多晶立方氮化硼（PcBN）切削材料的微晶尺寸。与已建立的PcBN切削材料相比，BNNC的硬度和热硬度更高，并且温度稳定性更高。利用基于BNNC的具有定义切削刃的刀具，可以为提高加工淬硬钢和超合金的工艺极限提供极好的选择。这次会议的贡献将展示无粘结剂纳米晶氮化硼（BNNC）的HP / HT直接合成中的最新发展和挑战，以及研究其在切削刀片中的研磨特性。

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