CAJ | 학술논문

以 TiCN-WC-Mo2 C-TaC-Co-Ni 为原料,通过成分和气氛控制,获得了功能梯度 TiCN 基金属陶瓷材料.采用带有能谱分析仪的扫描电子显微镜和 X射线衍射仪观察和分析了材料的微观组织和物相组成,通过车削实验考察了所制备的刀具的切削性能.结果表明,WC含量较低时,通过气氛控制可以获得表面富Ti层、中间富 W 层和基体的3层 TiCN 基金属陶瓷梯度层,烧结温度的提高有利于梯度层的厚度的增加；WC含量较高时,烧结后 WC 在表面富集.15％WC含量的TiCN基金属陶瓷在1460℃氮气气氛中烧结1 h时,富Ti层的厚度约为15~20μm,富 W层厚度约为15~20μm.经氮化烧结后材料表面的(Ti, W,Mo)(C,N)衍射峰相对材料内部向右偏移.真空烧结时,当 WC含量较低时,Ti 和 W元素分布比较均匀；随着 WC 含量的升高,表面出现了贫 Ti 富 W层,且随着 WC 含量增加,表面富 W层增厚,WC 含量为24％时,富 W层厚度＞25μm.切削实验表明表面富Ti的金属陶瓷的切削性能优于表面富 W的金属陶瓷材料.
이 TiCN-WC-Mo2 C-TaC-Co-Ni 위원료,통과성분화기분공제,획득료공능제도 TiCN 기금속도자재료.채용대유능보분석의적소묘전자현미경화 X사선연사의관찰화분석료재료적미관조직화물상조성,통과차삭실험고찰료소제비적도구적절삭성능.결과표명,WC함량교저시,통과기분공제가이획득표면부Ti층、중간부 W 층화기체적3층 TiCN 기금속도자제도층,소결온도적제고유리우제도층적후도적증가；WC함량교고시,소결후 WC 재표면부집.15％WC함량적TiCN기금속도자재1460℃담기기분중소결1 h시,부Ti층적후도약위15~20μm,부 W층후도약위15~20μm.경담화소결후재료표면적(Ti, W,Mo)(C,N)연사봉상대재료내부향우편이.진공소결시,당 WC함량교저시,Ti 화 W원소분포비교균균；수착 WC 함량적승고,표면출현료빈 Ti 부 W층,차수착 WC 함량증가,표면부 W층증후,WC 함량위24％시,부 W층후도＞25μm.절삭실험표명표면부Ti적금속도자적절삭성능우우표면부 W적금속도자재료.
TiCN-based functionally gradient cermets were prepared by controlling of the composition and atmos-phere and by using TiCN-WC-Mo2 C-TaC-Co-Ni as experimental materials.Material microstructure and phase composition were observed and analyzed by scanning electron microscopy with EDS and X-ray diffractometer, and the cutting performance was investigated by turning.The result shows that TiCN-based functionally gradi-ent cermets with Ti-enriched surface layer,W-enriched middle layer and the bottom were obtained by the con-trol of atmosphere when WC content was lower.Appropriate increasing of the sintering temperature was benefit to increase the thickness of gradient layers.WC was concentration at the surface when WC content was higher in raw composition sintering at nitrogen gas.The thickness of Ti and W enriched layer was about 15-20μm when 15%WC-TiCN based ceramics sintered at 1 460 ℃ in nitrogen atmosphere for 1 h.The (Ti,W,Mo)(C,N)dif-fraction peaks of the material surface shift to the right relative to the internal after nitriding sintering.In vacu-um sintering,the element of Ti and W was distributed uniform in a vacuum sintering when WC content was low.With the increase of WC content,the layers with poor Ti and W-enriched in gradually were appeared on the surface;in the meantime,the thickness of W-enriched on surface layer was increased.When WC content was 24%,W-enriched layer thickness was more than 25μm.Cutting experiment shows that TiCN-based func-tionally gradient cermets with Ti-enriched surface layer was superior than that with W-enriched surface.