http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
정국현,백경래,Teng Fei Zhang,김광호,김규정,신현일,강명창 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.10
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.
방전플라즈마 소결법을 이용한 Ti<sub>2</sub>AlC Max Phase 소결체의 소결온도 변화에 따른 재료 특성 평가
이창훈,백경래,정희상,정영근,강명창,Lee, Chang-Hun,Baek, Gyung Rae,Jung, Hee Sang,Jeong, Young-Keun,Kang, Myung Chang 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.3
In this study, ternary compound Max Phase $Ti_2AlC$ material was mixed by 3D ball milling as a function of ball milling time. More than 99.5 wt% pure $Ti_2AlC$ was synthesized by using spark plasma sintering method at 1000, 1100, 1200, and $1300^{\circ}C$ for 60 min. The material characteristics of synthesized samples were examined with relative density, hardness, and electrical conductivity as a function of sintering temperature. The phase composition of bulk was identified by X-ray diffraction. On the basis of FE-SEM result, a terraced structures which consists of several laminated layers were observed. And $Ti_2AlC$ bulk material obtained a vickers hardness of 5.1 GPa at the sintering temperature of $1100^{\circ}C$.
Ti<sub>2</sub>AlN과 Ti<sub>2</sub>AlC 소결체의 마이크로 방전가공에서 재료물성에 따른 가공표면 특성
최의성,이창훈,백경래,김광호,강명창,Choi, Eui-Song,Lee, Chang-Hoon,Baek, Gyung-Rae,Kim, KwangHo,Kang, Myung Chang 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.3
Ti alloys are extensively used in high-technology application because of their strength, oxidation resistance at high temperature. However, Ti alloys tend to be classified very difficult to cut material. In this paper, The powder synthesis, spark plasma sintering (SPS), bulk material properties such as electrical conductivity and thermal conductivity are systematically examined on $Ti_2AlN$ and $Ti_2AlC$ materials having most light-weight and oxidation resistance among the MAX phases. The bulk samples mainly consisted of $Ti_2AlN$ and $Ti_2AlC$ materials with density close to theoretical value were synthesized by a SPS method. Machining characteristics such as machining time, surface quality are analyzed with measurement of voltage and current waveform according to machining condition of micro-electrical discharge machining with micro-channel shape.