中国有色金属学报
中國有色金屬學報
중국유색금속학보
THE CHINESE JOURNAL OF NONFERROUS METALS
2013年
12期
3316-3322
,共7页
於广军%肖鹏%方华婵
於廣軍%肖鵬%方華嬋
어엄군%초붕%방화선
C/C复合材料%NiAl金属间化合物%钛%熔渗%润湿性
C/C複閤材料%NiAl金屬間化閤物%鈦%鎔滲%潤濕性
C/C복합재료%NiAl금속간화합물%태%용삼%윤습성
C/C composites%NiAl intermetallic%Ti%infiltration%wettability
通过铺展实验研究添加Ti对NiAl金属间化合物与C/C复合材料润湿性的影响，发现添加Ti元素可改善熔融NiAl与C/C复合材料基体的润湿性。以低密度C/C复合材料为坯体，采用真空熔渗法制备C/C-NiAl复合材料，利用X射线衍射(XRD)和扫描电镜(SEM)对材料进行分析。结果表明：添加的Ti粉含量(质量分数)为15%时，C/C复合材料熔渗NiAl金属间化合物的效果最佳，且TiC颗粒与NiAl熔体在C/C复合材料内部呈网状分布；渗NiAl后材料的密度从1.35 g/cm3提高到2.47 g/cm3，开孔率从27%下降到15.1%，沿平行纤维排布面方向的洛氏硬度较未渗NiAl的C/C复合材料提高约30.7%。添加Ti能改善C/C复合材料渗NiAl性能的主要原因是Ti与C反应形成的TiC改善了NiAl在C/C复合材料中的化学吸附和物理吸附特性。
通過鋪展實驗研究添加Ti對NiAl金屬間化閤物與C/C複閤材料潤濕性的影響，髮現添加Ti元素可改善鎔融NiAl與C/C複閤材料基體的潤濕性。以低密度C/C複閤材料為坯體，採用真空鎔滲法製備C/C-NiAl複閤材料，利用X射線衍射(XRD)和掃描電鏡(SEM)對材料進行分析。結果錶明：添加的Ti粉含量(質量分數)為15%時，C/C複閤材料鎔滲NiAl金屬間化閤物的效果最佳，且TiC顆粒與NiAl鎔體在C/C複閤材料內部呈網狀分佈；滲NiAl後材料的密度從1.35 g/cm3提高到2.47 g/cm3，開孔率從27%下降到15.1%，沿平行纖維排佈麵方嚮的洛氏硬度較未滲NiAl的C/C複閤材料提高約30.7%。添加Ti能改善C/C複閤材料滲NiAl性能的主要原因是Ti與C反應形成的TiC改善瞭NiAl在C/C複閤材料中的化學吸附和物理吸附特性。
통과포전실험연구첨가Ti대NiAl금속간화합물여C/C복합재료윤습성적영향，발현첨가Ti원소가개선용융NiAl여C/C복합재료기체적윤습성。이저밀도C/C복합재료위배체，채용진공용삼법제비C/C-NiAl복합재료，이용X사선연사(XRD)화소묘전경(SEM)대재료진행분석。결과표명：첨가적Ti분함량(질량분수)위15%시，C/C복합재료용삼NiAl금속간화합물적효과최가，차TiC과립여NiAl용체재C/C복합재료내부정망상분포；삼NiAl후재료적밀도종1.35 g/cm3제고도2.47 g/cm3，개공솔종27%하강도15.1%，연평행섬유배포면방향적락씨경도교미삼NiAl적C/C복합재료제고약30.7%。첨가Ti능개선C/C복합재료삼NiAl성능적주요원인시Ti여C반응형성적TiC개선료NiAl재C/C복합재료중적화학흡부화물리흡부특성。
The influence of adding titanium on the wettability of molten NiAl intermetallic on the surface of C/C composites was investigated by spreading experiment. It is indicated that adding Ti can improve the wettability between C/C composites and NiAl intermetallic. Using the low-density C/C composite perform the C/C-NiAl composites were prepared by the vacuum molten infiltration. The composites were analyzed by X-ray diffraction(XRD) and scanning electronic microscope(SEM). The results show that NiAl with about 15%Ti (mass fraction) possesses good wettability on the surface of C/C composites. The TiC particles and NiAl melt present network distribution in C/C composites internal. The density increases from 1.35 g/cm3 to 2.47 g/cm3 while the porosity decreases from 27%to 15.1%after the infiltration of NiAl. On the other hand, the Rockwell hardness of C/C-NiAl composites increases by 30.7%in the direction parallel to fiber fabric plane compared with that of C/C composites. The improvement of adding Ti for molten NiAl infiltration into the C/C composites results from the improvement of the chemical and physical adsorption characteristics of NiAl alloy on the composites, which is caused by TiC from reaction of Ti and C.
