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MAX-phase Ti2AlC ceramics: syntheses, properties and feasibility of applications in micro electrical discharge machining

김광호|김규정|강명창|Teng Fei Zhang|백경래|정국현|신현일
청정에너지연구소 (Clean-Energy Research Institute)|2016.10|Journal of Ceramic Processing Research|제17권 제10호|pp. 1116-1122|DOI 10.36410/jcpr.2016.17.10.1116

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참고문헌

키워드

Mechanical propertiesSpark plasma sinteringOxidation behaviorMicro electrical discharge machiningMAX-phase Ti2AlCElectrical and thermal conductivities
주제분류재료공학

초록

MAX-phase Ti2AlC bulk ceramic was rapidly fabricated by spark plasma sintering (SPS) at 1000 oC and 1100 oC. To obtainmonolithic MAX-phase Ti2AlC, the molar composition (Ti:Al:C) was varied from 1:0.9:1 to 1:1.4:1. The microstructure andmaterial properties of the Ti2AlC ceramics were systematically investigated. The results show an optimized Al mole fractionof 1.1, with which nearly pure MAX-phase Ti2AlC ceramics were synthesized. Insufficient or excessive Al content resulted inimpurities. The maximum relative density, hardness, electrical and thermal conductivities were also obtained at an Al molefraction of 1.1. These properties were superior to those of Ti-6Al-4V alloys. The micro-Electrical Discharge Machining(ì-EDM)results showed that the MAX-phase Ti2AlC ceramics exhibited smaller average micro-hole diameters, shorter machining times,and shorter electrode wear lengths after machining than commercial Ti-6Al-4V alloys, with no obvious local erosion damagenear the hole entrance and no tapering effect inside the microholes. This should be attributed to the excellent electrical andthermal characteristics of MAX phases. This demonstrates that MAX-phase Ti2AlC ceramics are promising candidate for inmicro-EDM applications.

Abstract

MAX-phase Ti2AlC bulk ceramic was rapidly fabricated by spark plasma sintering (SPS) at 1000 oC and 1100 oC. To obtainmonolithic MAX-phase Ti2AlC, the molar composition (Ti:Al:C) was varied from 1:0.9:1 to 1:1.4:1. The microstructure andmaterial properties of the Ti2AlC ceramics were systematically investigated. The results show an optimized Al mole fractionof 1.1, with which nearly pure MAX-phase Ti2AlC ceramics were synthesized. Insufficient or excessive Al content resulted inimpurities. The maximum relative density, hardness, electrical and thermal conductivities were also obtained at an Al molefraction of 1.1. These properties were superior to those of Ti-6Al-4V alloys. The micro-Electrical Discharge Machining(ì-EDM)results showed that the MAX-phase Ti2AlC ceramics exhibited smaller average micro-hole diameters, shorter machining times,and shorter electrode wear lengths after machining than commercial Ti-6Al-4V alloys, with no obvious local erosion damagenear the hole entrance and no tapering effect inside the microholes. This should be attributed to the excellent electrical andthermal characteristics of MAX phases. This demonstrates that MAX-phase Ti2AlC ceramics are promising candidate for inmicro-EDM applications.

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