共查询到18条相似文献,搜索用时 93 毫秒
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Ti3SiC2是一种具有优良性能的可加工陶瓷材料.通过与第二相的复合,Ti3SiC2复合材料克服了单一材料的某些缺点,扩大了Ti3SiC2的应用领域.颗粒弥散增强Ti3SiC2复合材料,相对于Ti3SiC2单相材料,具有更高的硬度、耐磨性和强度,但是损失了部分可加工性与韧性.Ti3SiC2作为超硬复合材料的结合剂,克服... 相似文献
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以Ti3AlC2和Cu粉作为原料,使用放电等离子烧结制备Cu/Ti3AlC2复合材料,研究了不同烧结温度对复合材料的影响。结果表明,在750~800℃之间,Cu与Ti3AlC2之间会发生反应生成TiC相。同时随着温度在650~850℃不断增加,密度和抗弯强度不断增加在850℃达到最大值分别为8.33 g·cm^-3和531.4 MPa,而电阻率先减小在750℃达到最小值1.98×10^-7Ω·m后增加在850℃达到最大值6.47×10^-7Ω·m。Cu/Ti3AlC2复合材料性能随着温度的变化与其致密度和反应生成TiC有着密切的联系。 相似文献
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Ti_3AlC_2陶瓷的热压合成 总被引:1,自引:0,他引:1
以TiC-Ti-Al为反应体系,采用原位热压技术制备Ti3AlC2陶瓷。借助XRD分析相组成,并对实验现象进行分析。结果表明,TiC的加入,避免了Ti和C粉之间强烈的放热反应。通过降低初始压坯尺寸抑制了"热爆行为",有利于合成高纯Ti3AlC2。用大压坯时,"热爆行为"明显,产物由Ti3AlC2、TiC和Ti3Al相组成,Ti3AlC2含量少;用小压坯时,未发生"热爆行为",产物由Ti3AlC2和TiC相组成,Ti3AlC2相含量较高。 相似文献
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研究常温下He离子辐照对Ti3AlC2材料形貌和结构的影响并对其机理进行了分析.采用能量为70 keV,剂量为1×1017ions/cm2,位移损伤峰值为16.4 dpa的He离子注入Ti3AlC2材料;发现Ti3AlC2材料辐照损伤和He离子浓度有关,随着He离子浓度增大,辐照损伤程度越大;Ti3AlC2材料经过He离子辐照后产生会有孔洞、凸起和氦气泡产生;与此同时,Ti3AlC2结构上发生ɑ相到β相的转变,并对Ti3AlC2材料的损伤机理进行分析. 相似文献
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以TiC、Ti和Al粉为原材料,采用冷压预成型-热压辅助工艺原位制备Ti3 AlC2陶瓷.借助反应吉布斯自由能分析TiC-Ti-Al体系的合成机制,采用XRD和SEM分析工艺因素如升温速率、Al含量、烧结温度和压坯尺寸对原位合成Ti3 AlC2陶瓷的影响.结果表明,通过调控工艺,成功合成了高纯度Ti3 AlC2陶瓷,Ti3 AlC2具有典型的层状结构.该反应体系的最佳升温速率为:1000℃之前,20℃/min; 1000℃之后,10℃/min.用纳米TiC粉替代微米TiC粉,烧结温度由1450℃降至1350℃,且Ti3 AlC2的合成纯度更高.当采用大尺寸压坯时,发生了“热爆”现象,非平衡相较多,Ti3 AlC2的生成含量较低,且样品开裂严重.Ti3 AlC2的合成过程为:Ti与Al反应生成TiAl金属间化合物,接着TiAl与TiC反应生成Ti3AlC2. 相似文献
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自蔓延高温合成Ti3AlC2 和Ti2AlC及其反应机理研究 总被引:17,自引:1,他引:17
以Ti,Al和C的粉体混合物为原料,在纯氩气气氛,25MPa压力,1600℃保温4h条件下,自蔓延高温合成了Ti3AlC2和Ti2AlCT,利用X射线衍射分析(XRD)和扫描电镜(SEM)等手段对反应产物进行了研究,提出了自蔓延高温合成Ti3AlC2和Ti2AlC应具备的条件,并探讨了Ti,Al和C自蔓延高温合成Ti3AlC2和Ti2AlC的反应机理,结果表明,Ti3AlC2和Ti2AlC能够由Ti,Al和C元素经高温自蔓延合成反应来制备,其制备的必要条件是需要极快的加热速率以防止铝熔化并且改变钛的转移路线,Ti3AlC和Ti2AlC综合了金属材料和陶瓷材料的优点,成功的应用自蔓延高温方法合成Ti2AlC2和TiAlC必将成为该类材料纯块体的合成和制备提供好的原料,从而这类材料的实际应用将起到极大的推动作用。 相似文献
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层状结构的Ti3SiC2属六方晶体结构,结合了金属和陶瓷的许多优异性能,如良好的导热和导电性能,优良的可加工性,耐氧化、耐化学腐蚀,优异的抗热震性,良好的自润滑性等,具有广阔的应用前景.本文介绍了Ti3SiC2的结构和性能,对其制备方法及应用进行了阐述. 相似文献
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Chenlong Wu Rui Zhang Fuyan Liu Biao Chen 《International Journal of Applied Ceramic Technology》2023,20(3):1846-1854
The electrochemical corrosion behaviors of Ti3SiC2/Cu composite and polycrystalline Ti3SiC2 in a 3.5% NaCl medium were investigated by dynamic potential polarization, potentiostat polarization, and electrochemical impedance spectroscopy. The polycrystalline Ti3SiC2 was tested on the identical condition as a control. The characterizations of XRD, X-ray photoelectron spectroscopy, scanning electron microscope, and energy-dispersive spectrometer were used to study the relevant passivation behavior and corrosive mechanism. The self-corrosion current density of Ti3SiC2/Cu (6.46 × 10−6 A/cm2) was slightly higher than that of Ti3SiC2 (1.64 × 10−7 A/cm2). Under open circuit potential, the corrosion resistance of Ti3SiC2/Cu was better than that of Ti3SiC2. Ti3SiC2/Cu exhibited a typical passivation feature with a narrow passivation interval and a breakdown phenomenon. The better corrosion resistance of Ti3SiC2 was due to the more stable Si layer of the former. In comparison, for Ti3SiC2/Cu composites, Cu reacted with the reactive Si layers in Ti3SiC2 to form Cu–Si compounds and TiC, destroying the weak interaction between Si layers and Ti–C layers. In the other hand, the as-formed Cu–Si compounds and TiC dissolved during the corrosion of Ti3SiC2/Cu in the 3.5% NaCl medium, causing to the destruction of the passivation film on its surface. 相似文献
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Effect of Al addition on the synthesis of Ti3SiC2 bulk material by pulse discharge sintering process
Songlan Yang ZhengMing Sun Qiaoqin Yang Hitoshi Hashimoto 《Journal of the European Ceramic Society》2007,27(16):4807-4812
Ti3SiC2 bulk materials were synthesized from the starting powders of 1Ti/1Si/2TiC–xAl and 3Ti/1SiC/1C–xAl (molar ratios, x ranges from 0.05 to 0.15) at temperatures between 1100 and 1400 °C for 15 min by pulse discharge sintering technique. X-ray diffraction and scanning electron microscopy were used to characterize the synthesized materials. It was found that the addition of Al decreases the content of TiC in the sintered samples and expands the optimal temperature range for the synthesis of Ti3SiC2 bulk materials. By addition of Al, Ti3SiC2 bulk materials of high phase-purity have been synthesized at 1100 and 1200 °C from 1Ti/1Si/2TiC and 3Ti/1SiC/1C starting powders, respectively. 相似文献
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