Study on the effect of multi-walled carbon nanotube (MWCNT) addition on the microstructure, mechanical and cutting performance of silicon nitride ceramic tools

IF 4.2 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Refractory Metals & Hard Materials Pub Date : 2024-09-27 DOI:10.1016/j.ijrmhm.2024.106907

Lei Huang, Yingxu Dong, Zhenhua Wang, Dongying Zhang, Zuorong Yu

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Abstract

Silicon nitride (Si₃N₄) ceramics incorporated with 0–1.5 wt% multi-walled carbon nanotubes (MWCNTs) were synthesised by the spark plasma sintering technology. The effects of the low-content MWCNT addition on the microstructure, density, mechanical properties and cutting performance against nickel-based superalloys (Inconel 718) of the Si₃N₄/MWCNTs ceramic tools were investigated by the X-ray diffraction, field emission scanning electron microscope, Vickers hardness tester, universal tester, ball-on-disk reciprocating tester and cutting experiment. The results showed that the incorporation of MWCNTs enhanced the conversion rate of Si₃N₄ structure from the polar α form to the polar β form and reduced the friction coefficient of the composite. However, due to the agglomeration of MWCNTs, the hardness and fracture toughness of the Si₃N₄/MWCNTs ceramics were observed to decrease by 5.03 % and 13.97 %, respectively, compared to pure Si₃N₄ ceramics. A higher addition rate of the MWCNT would further accelerate tool wear and significantly diminish tool life. The predominant wear mechanism of the Si₃N₄/MWCNTs ceramic tools when milling Inconel 718 was groove-shape wear and adhesive wear.

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研究添加多壁碳纳米管 (MWCNT) 对氮化硅陶瓷工具微观结构、机械和切削性能的影响

采用火花等离子烧结技术合成了含有 0-1.5 wt% 多壁碳纳米管 (MWCNT) 的氮化硅 (Si3N4) 陶瓷。通过 X 射线衍射、场发射扫描电子显微镜、维氏硬度计、万能试验机、盘上球往复试验机和切削实验，研究了低含量 MWCNT 的添加对 Si3N4/MWCNTs 陶瓷工具的微观结构、密度、机械性能和与镍基超级合金（Inconel 718）的切削性能的影响。结果表明，MWCNTs 的加入提高了 Si3N4 结构从极性 α 形式向极性 β 形式的转化率，降低了复合材料的摩擦系数。然而，由于 MWCNTs 的聚集，与纯 Si3N4 陶瓷相比，Si3N4/MWCNTs 陶瓷的硬度和断裂韧性分别降低了 5.03 % 和 13.97 %。更高的 MWCNT 添加率会进一步加速工具磨损，显著降低工具寿命。在铣削 Inconel 718 时，Si3N4/MWCNTs 陶瓷工具的主要磨损机制是槽形磨损和粘着磨损。

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来源期刊

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.