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发明公开
CN102821898A 立方氮化硼烧结体和立方氮化硼烧结体工具 有权

立方氮化硼烧结体和立方氮化硼烧结体工具
摘要：
本发明的目的是提供一种cBN烧结体，并提供一种cBN烧结体工具，该cBN烧结体即使在加工具有难以加工的性质的离心铸铁时也具有优异的耐磨性和耐断裂性。本发明的cBN烧结体包含20体积%以上且65体积%以下的cBN；作为结合剂的Al2O3以及选自由Zr的氮化物、碳化物、碳氮化物、硼化物和硼氮化物及其固溶体所构成的组中的至少一种（以下称为“X”），其中Al2O3为34体积%以上且小于80体积%；以及ZrO2，X和ZrO2的总量为1.0体积%以上且6.0体积%以下，ZrO2与Al2O3的体积比ZrO2/Al2O3为大于或等于0.010且小于0.100，其中I正方晶ZrO2(101)/IαAl2O3(110)的比值为大于或等于0.1且小于或等于3，其中，在所述cBN烧结体的X射线衍射峰中，I正方晶ZrO2(101)为正方晶ZrO2的（101）面的强度，IαAl2O3(110)为αAl2O3的（110）面的强度。
摘要（英）：

The purpose of the present invention is to provide a cBN sintered body having excellent antifriction properties and defect resistance even in the machining of hard centrifugally cast iron, and to also provide a cBN sintered body tool. This cBN sintered body contains: between 20 and 65 volume % cBN; between 34 and 80 volume % Al2O3 as a bonding material; at least one type (hereinafter X) selected from Zr nitrides, carbides, carbonitrides, borides, boronitrides, and the solid solutions thereof; and ZrO2. The total of X and ZrO2 is between 1.0 and 6.0 volume %. The volume % ratio of ZrO2 and Al2O3, ZrO2/Al2O3, is at least 0.010 and less than 0.100. When, in the x-ray diffraction peak of the cBN sintered body, the intensity of a plane (101) of the tetragonal ZrO2 is Itetragonal ZrO2 (101), and the intensity of a plane (110) of the aAl2O3 (110) is IaAl2O3 (110), Itetragonal ZrO2 (101)/IaAl2O3 (110) is between 0.1 and 3.

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