低烧蚀碳/碳复合材料切削刀具适应性研究

Tool Applicability of the C / C Composite With Low Ablation Rate

通过对切削规律进行系统实验和深入分析的基础上,探讨切削低烧蚀碳/碳复合材料过程中的切削温度、刀具耐用度、刀具的磨损等方面的基本规律。结果表明,低烧蚀碳/碳复合材料较普通碳/碳复合材料增加了难熔金属化合物颗粒,该颗粒极大改变了材料的切削特性;切削温度略有上升,但远低于金属材料的切削温度,不会影响刀具寿命;所添加的颗粒硬度极高,对刀具有明显的硬质点划擦磨损,造成刀具耐用度急剧下降;各种刀具磨损以硬质点磨损为主,同时存在不同的磨损和破损形式。

To improve oxidation resistance, the granule of refractory metal compound is intermingled with car- bon-carbon composite. The change of matrix influences the mechanical property greatly. The cutting temperature in- creased slightly, which was lower than the temperature of common metal obviously. The influence of the cutting tem- perature for the tool life is minimal. However the high hardness of the granule of refractory compound caused the abra- sive increas dramatically, and the decreased of tool life. The dominant wear mechanism was abrasive wear, meanwhile there was different form of tool wear and tool breakage.