Cutting resistance of metal-ceramic interpenetrating composites
Cutting resistance of metal-ceramic interpenetrating composites
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DOI：
10.1016/j.ceramint.2016.11.124
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发表时间：
2017-02
影响因子：
5.2
通讯作者：
Jing Liu;Jinyu Wu;J. Binner
中科院分区：
文献类型：
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作者：
Jing Liu;Jinyu Wu;J. Binner
金属陶瓷互穿复合材料（IPC）可以通过陶瓷泡沫与熔融金属的无压渗透来成功制造。由此产生的 IPC，其中两个相都是三维连续的，具有许多潜在的应用，包括耐磨和防弹等用途。由于这些材料极难切割或加工，因此一种潜在的应用是耐切割安全材料。该项目研究了它们的切削阻力，以了解其支撑机制。该复合材料是通过在大气压下将 Al-10 wt% 镁合金渗透到不同密度的凝胶铸造尖晶石和莫来石泡沫中而制成的。使用金刚石切割轮对样品进行切割，以确定不同条件下的切割速率，并主要使用一系列基于电子显微镜的技术来表征切割产品、切割工具和碎片。正如预期的那样，我们发现切削阻力在很大程度上取决于 IPC 的硬度，但也有证据表明连续金属相发挥的作用。塑性变形会消耗能量并弥合裂纹；压缩和剪切双重作用下的应变硬化可以提高切削尖端处金属的硬度和强度，粘着磨损被认为是刀具快速失效的主要原因。此外，通过无压渗透生产的金属陶瓷IPC在各相之间表现出非常好的界面结合。
Metal-ceramic interpenetrating composites (IPCs) can be successfully manufactured by the pressureless infiltration of ceramic foams with molten metals. The resulting IPCs, in which both phases are three dimensionally continuous, have many potential applications, including wear and ballistic resistance amongst other uses. As these materials are extremely difficult to cut or machine, one potential application is for cut-resistant security materials. This project investigated their cutting resistance with a view to understanding the underpinning mechanisms.The composites were produced by infiltrating Al-10 wt% Mg alloy into gel-cast spinel and mullite foams of different densities at atmospheric pressure. Samples were subject to cutting using a diamond slitting wheel to determine cutting rates under different conditions and the cut products, cutting tools and debris were characterised, primarily using a range of electron microscopy-based techniques. As expected, the cutting resistance was found to be largely dependent on the hardness of the IPCs, however evidence was also found of the role that is played by the continuous metallic phase. Plastic deformation can consume energy and bridge cracks; strain hardening under the twin actions of compression and shearing can enhance the hardness and strength of the metal at the cut tips and adhesive wear is believed to be the main origin of rapid tool failure. In addition, metal-ceramic IPCs produced via pressureless infiltration show very good interfacial bonding between the phases.