CAJ | 학술논문

在硅酸盐溶液中,采用类三角波形脉冲等离子体电解氧化电源,在TC4钛合金表面原位制备陶瓷膜层,利用XRD、SEM和能谱等研究了陶瓷膜层的组成和结构特点,利用热震实验研究了陶瓷膜层的抗热震性能.陶瓷膜层主要由金红石型和锐钛矿型TiO_2组成,反应时间增加,膜层增厚,表面放电孔道减少,孔径变大.能谱分析表明,陶瓷膜层中硅元素含量随着反应时间的增加而增多,钛元素含量的变化与之相反.在900～20 ℃热震条件下,膜层的抗热震性能随反应时间的增大而提高,在反应为25 min时,所制备的膜层抗热震性能最佳,继续延长反应时间,膜层的抗热震性能下降.热震试验使陶瓷膜层中晶相TiO_2含量增加,膜层表面出现裂纹.
재규산염용액중,채용류삼각파형맥충등리자체전해양화전원,재TC4태합금표면원위제비도자막층,이용XRD、SEM화능보등연구료도자막층적조성화결구특점,이용열진실험연구료도자막층적항열진성능.도자막층주요유금홍석형화예태광형TiO_2조성,반응시간증가,막층증후,표면방전공도감소,공경변대.능보분석표명,도자막층중규원소함량수착반응시간적증가이증다,태원소함량적변화여지상반.재900～20 ℃열진조건하,막층적항열진성능수반응시간적증대이제고,재반응위25 min시,소제비적막층항열진성능최가,계속연장반응시간,막층적항열진성능하강.열진시험사도자막층중정상TiO_2함량증가,막층표면출현렬문.
Ceramic coatings were prepared in silicate solution on TC4 alloy by analogous triangle-shape plasma electrolytic oxidation power source. The composition and structure of the coatings were studied by XRD, SEM and EDS, respectively. The thermal shock resistance was examined by thermal shock tests. The results showed that the coating was composed of rutile and anatase TiO_2. Increasing the reaction time, the thickness of the coating increases and the number of micro holes deoreases, whose pore size increases. The results of EDS showed that the content of Si in the coating increases with the reaction time whereas the content variation of Ti showed the opposite trend. At the thermal shock tests of 900～20 ℃, the thermal shock resistance of the coating was improved with the reaction time and reached optimum value when the reaction time was 25 min, then decreased with the further extending time. During thermal shock tests the content of the cyrstlized TiO_2 in the coating increases and meantime the micro cracks was found on the coating surface after the thermal shock tests.