无黏结剂层状BN增韧cBN刀具材料的研究

doi:10.15541/jim20210300

无机材料学报 ›› 2022, Vol. 37 ›› Issue (6): 623-628.DOI: 10.15541/jim20210300

无黏结剂层状BN增韧cBN刀具材料的研究

陈俊云¹^,²(), 孙磊², 靳田野¹^,², 罗坤², 赵智胜²(), 田永君²

1.燕山大学机械工程学院, 秦皇岛 066004
2.燕山大学亚稳材料制备技术与科学国家重点实验室, 高压科学研究中心, 秦皇岛 066004

收稿日期:2021-05-12 修回日期:2021-06-15 出版日期:2022-06-20 网络出版日期:2021-06-30
通讯作者: 赵智胜, 教授. E-mail: zzhao@ysu.edu.cn
作者简介:陈俊云(1983-), 女, 教授. E-mail: sophiacjy@ysu.edu.cn
基金资助:
国家重点研发计划(2018YFA0703400);国家自然科学基金(52090020);国家自然科学基金(51775482);国家自然科学基金(91963203)

Binderless Layered BN Toughened cBN for Ultra-precision Cutting

CHEN Junyun¹^,²(), SUN Lei², JIN Tianye¹^,², LUO Kun², ZHAO Zhisheng²(), TIAN Yongjun²

1. School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
2. Center for High Pressure Science, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China

Received:2021-05-12 Revised:2021-06-15 Published:2022-06-20 Online:2021-06-30
Contact: ZHAO Zhisheng, professor. E-mail: zzhao@ysu.edu.cn
About author:CHEN Junyun (1983–), female, professor. E-mail: sophiacjy@ysu.edu.cn
Supported by:
National Key Research and Development Program of China(2018YFA0703400);National Natural Science Foundation of China(52090020);National Natural Science Foundation of China(51775482);National Natural Science Foundation of China(91963203)

摘要/Abstract

摘要：

无粘结剂cBN材料制作的切削刀具韧性较差, 并且这种材料的合成压力高。为此, 本研究在工业压力下制备了超硬、高韧的新型无粘结剂层状BN增韧cBN (Lt-cBN)块材, 通过切削硬质合金实验, 分析了Lt-cBN材料内部微观结构对其切削性能和耐磨性的影响。研究结果表明: Lt-cBN材料的韧性高达8.5 MPa·m^1/2, 可超精密切削硬质合金, 获得了粗糙度R_a低于10 nm的超光滑表面; Lt-cBN材料内部存在少量层状BN, 不仅提高了韧性, 还降低了表层材料的非晶化程度及磨损速率; 相对于商品化的纯相cBN材料, Lt-cBN材料展现出更好的切削性能和耐磨性; Lt-cBN材料的主要磨损形式为后刀面的部分非晶化, 并在摩擦作用下逐渐被去除而导致的磨料磨损。

关键词: 无粘结剂cBN, 层状BN, 超精密切削, 耐磨性, 硬质合金

Abstract:

Poor toughness and high synthesis pressure of binderless cBN limits its application in the field of cutting tool. To enhance its toughness, an advanced layered BN toughened cBN (Lt-cBN) bulk was developed under industrial pressure. Then, the cutting performance and wear resistance of Lt-cBN was analyzed based on the unique microstructure during tungsten carbide cutting. It is found that the Lt-cBN reaches a high fracture toughness of 8.5 MPa·m^1/2, and is capable of realizing ultra-precision cutting of tungsten carbide with smooth surface of roughness lower than R_a 10 nm. The layered BN at the intersection of cBN grains within Lt-cBN contributes to the enhanced toughness, which further slows down the transformation of amorphization as well as the wear rate of the surface layer. Thus Lt-cBN exhibits better cutting performance and wear resistance in contrast to commercial binderless pure cBN material. The wear of Lt-cBN can be explained by the soft partially amorphous layer formed on the flank surface being rubbed and continuously removed in the form of abrasive wear.

Key words: binderless cBN, layered BN, ultra-precision cutting, wear resistance, tungsten carbide

中图分类号:

TH145

陈俊云, 孙磊, 靳田野, 罗坤, 赵智胜, 田永君. 无黏结剂层状BN增韧cBN刀具材料的研究[J]. 无机材料学报, 2022, 37(6): 623-628.

CHEN Junyun, SUN Lei, JIN Tianye, LUO Kun, ZHAO Zhisheng, TIAN Yongjun. Binderless Layered BN Toughened cBN for Ultra-precision Cutting[J]. Journal of Inorganic Materials, 2022, 37(6): 623-628.

图/表 9

图1 Lt-cBN内部微观结构(插图为Lt-cBN照片)(a)和晶粒交界处的层状BN结构形貌(b)

Fig. 1 Images of Lt-cBN microstructure with insert showing its bulk (a) and layered BN at the intersection of grains (b)

图2 切削实验装置

Fig. 2 Cutting experimental device

表1 硬质合金切削表面粗糙度和切削力

Table 1 Surface roughness of tungsten carbide and cutting force

Rake angle/(°)	Tool	Surface roughness, R_a/nm	Rake angle/(°)	Cutting force/N
0	Lt-cBN	13.3	0	0.296
0	NCB100	33.4	0	1.528
-15	Lt-cBN	25.2	-15	2.990
-15	NCB100	41.1	-15	6.018
-30	Lt-cBN	49.6	-30	—
-30	NCB100	52.0	-30	—

图3 硬质合金的切削表面形貌(a)、切屑(b)和切削工件(c)

Fig. 3 Machined surface morphology (a), chips produced during cutting (b) and mirror-like surface of workpiece (c)

图4 后刀面磨损区域的最大宽度VBmax

Fig. 4 The maximum width VBmax of the flank wear area

图5 切削硬质合金后刀具的磨损形貌

Fig. 5 Morphologies of wear zone on the tool flank

图6 Lt-cBN刀具磨损区域内的透射电镜高分辨图像和对应的快速傅里叶变换

Fig. 6 HRTEM image and the corresponding fast Fourier transform behind the wear zone of Lt-cBN tool

图7 NCB100刀具磨损区域内的透射电镜高分辨图像和对应的快速傅里叶变换

Fig. 7 HRTEM image and the corresponding fast Fourier transform behind the wear zone of NCB100 tool

图8 NCB100材料基体的显微组织结构

Fig. 8 Initial microstructure of NCB100 material

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无黏结剂层状BN增韧cBN刀具材料的研究

Binderless Layered BN Toughened cBN for Ultra-precision Cutting

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