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主要研究内容包括如下几个方面: 粘结相 Ni- Co( Ni ∶ Co = 1 ∶1 , 质量比, 下同) 与不同 N/ C 比的硬质相 Ti( C, N)( Ti N/( Ti C+ Ti N) = 0 .1 ,0 .3 ,0 .5 ,0 .7 ,0 .9) 之间的润湿规律;粘结相 Ni- Co - Mo , Ni - Co - Ta , Ni- Co - Mo - C 与硬质相 Ti( C, N) 之间的润湿情况;以及在 Ti( C, N) 硬质相中添加 Ta C, Nb C 等对润湿性的影响。研究表明,当硬质相中 Ti N/ ( Ti C+ Ti N) < 0 .5 时宜采用 Ni - Co 作粘结相, 而当 Ti N/ ( Ti C+ Ti N) ≥0 .5时,则应选择 Ni- Co - Mo - C 作粘结相更适合。 相似文献
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张杰 《稀有金属与硬质合金》1996,(1):26-28
研究发现:在80℃时,用浓盐酸溶解Ti(CN)基金属陶瓷粉末,粘结相Ni中的W、Mo、Ti等固溶元素并不能完全溶解,与文献[3]的报道不符;而在80℃时,用浓盐酸加硫酸则能完全溶解。按本试验提供的方法,可以定量测定Ti(CN)基金属陶瓷的粘结相中的固溶元素,方法简便易行,结果再现性较好。 相似文献
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原位生成TiB2颗粒增韧B4C陶瓷的研究 总被引:9,自引:0,他引:9
通过TiC与B4C的化学反应,在B4C基体内原位生成TiB2颗粒,获得的TiB2颗粒径一般在3μm以下。其中加入20vol%TiC(对应的TiB2为35vol%)的复相陶瓷的断裂韧性值Kic达6.3MPa.m^1/2。比单体B4C提高75%,加入10vol%TiC(对应的TiB2为14vol%)的复相陶瓷的抗弯强度达到最大值620MPa,比单体B4C提高40%,由B4C和TiB2颗粒之间热膨胀系数 相似文献
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本文采用场离子显微镜原子探针实验技术,对一种马氏体时效钢(Fe-18.2%Ni-8.8%Co-2.9%Mo-0.7%Ti-0.2%Si)的时效析出产物进行了研究。实验研究了该合金在510℃时效4h所产生析出物的形貌与成分,发现有两种金属间化合物相(Ni3Ti与Fe7Mo6型)产生时效强化,在时效组织中还存在有少量回复奥氏体。 相似文献
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向Al2O3/TiC陶瓷材料中分别添加15%ZrO2、15%ZrO2+22%SiCw,得到的ATZ和ATZS复合材料的弯曲强度σf、断裂韧性KIC均比基体Al2O3/TiC增加一倍,分别提高到989MPa、10.96MPa·m^1/2和1094MPa、11.26MPa·m^1/2。用SEM和TEM对材料显微结构、断口形貌及界面结合情况进行观察分析表明,ATZ和ATZS复合材料的强韧化机制主要为Zr 相似文献
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热压工艺参数对纳米SiC—Al2O3/TiC新型陶瓷刀具材料力学性?… 总被引:3,自引:0,他引:3
研究了压力、热压温度和保温时间等工艺因素对纳米SiC-Al2O3/TiC系新型陶瓷刀具材料的抗弯强度、韧性和硬度的影响。结果表明,对于纳米SiC-Al2O3/TiC系陶瓷复合材料,在压力为30MPa热压温度为1700℃,保温时间为60min时,材料的性能最好。 相似文献
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马氏体时效钢的时效析出产物 总被引:5,自引:0,他引:5
本文采用场离子显微镜原子探针实验技术,对一种马氏体时效钢(Fe-18.2%Ni-8.8%Co--2.9%Mo-0.7%Ti-0.2%Si)的时效析出产物进行了研究。实验研究了该合金在510℃时效4h所产生析出物的形貌与成分,发现有两种金属间化合物相(Ni_3Ti与Fe_7Mo_6型)产生时效强化,在时效组织中还存在有少量回复奥氏体。 相似文献
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Mohammad Hassan Shirani Bidabadi Ali Saidi Masoud Kasiri Mohammad Ahmadi Renani Akbar Chami 《Metallurgical and Materials Transactions A》2013,44(10):4800-4808
In the current study, Ni50Fe50 alloy powders were prepared using a high-energy planetary ball mill. The effects of TiC addition (0, 5, 10, 20, and 30 wt pct) and milling time on the sequence of alloy formation, the microstructure, and microhardness of the product were studied. The structure of solid solution phase, the lattice parameter, lattice strain, and grain size were identified by X-ray diffraction analysis. The correlation between the apparent densities and the milling time is explained by the morphologic evolution of the powder particles occurring during the high-energy milling process. The powder morphology was examined using scanning electron microscopy. It was found that FCC γ (Fe–Ni) solid solution was formed after 10 hours of milling, and this time was reduced to 7 hours when TiC was added. Therefore, brittle particles (TiC) accelerate the milling process by increasing crystal defects leading to a shorter diffusion path. Observations of polished cross section showed uniform distribution of the reinforcement particles. The apparent density increases with the increasing TiC content. It was also found that the higher TiC amount leads to larger lattice parameter, higher internal strain, and lower grain size of the alloy. 相似文献
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采用粉末冶金法(powder metallurgy,PM)和超固相线液相烧结技术(super solid phase line liquid phase sintering,SLPS)制备出TiC颗粒增强(TiCP)+含质量分数20%Cr的烧结高铬铸铁(high chromium cast iron,HCCI)复合材料。利用光学显微镜、扫描电子显微镜(scanning electron microscope,SEM)和X射线衍射仪(X-ray diffraction,XRD)研究了TiC颗粒增强相含量(质量分数)对TiCP/HCCI复合材料物相组成、显微组织和力学性能的影响,并开展了后续热处理研究。结果表明:超固相线液相烧结技术制备出的TiCP/HCCI复合材料相对密度均达97%以上,其物相组成为马氏体、奥氏体、M7C3碳化物和TiC。TiC颗粒主要沿着高铬铸铁中金属基体/碳化物界面分布,随着TiC含量增加,复合材料的硬度显著增加,达到HRC 67.2,但冲击韧性却逐步降低,合金断裂机制也由准解理性断裂向沿晶完全解理性断裂转变。经淬火处理后,该类TiCP/HCCI复合材料的硬度可进一步提升至HRC 69.3,有望成为硬度介于高铬铸铁和硬质合金之间的优秀耐磨材料。 相似文献
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采用混合粉热压工艺制备了FcAl/TiC复合材料。研究了TiC含量、粘结相成分以及反应热压工艺对致密化过程和力学性能的影响。研究结果表明:复合材料的密度随TiC含量增加而减小;硬度和抗弯强度随TiC体积分数增加而出现峰值,增加Al含量有利于致密化,但因引入过多的氧化夹杂和热空位会导致力学性能降低;热压温度和压力等工艺参数也对材料的性能有影响。 相似文献
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Al-Ti-C master alloy was prepared by SHS (Self-propagating High temperature Synthesis)-melting technique. Effect of yttrium addition level on the microstructures of the master alloy was studied by XRD, SEM and EDS. The experimental results show that the addition of 1.0%Y is beneficial to the formation of TiC particles; Al-Ti-C-1.0Y consists of rod-like and blocky TiAl3, TiC, Al3Y and α-Al matrix. Y is found around TiC particles in Al-Ti-C-0.5Y master alloy while blocky (AlTiY) phase appears in Al-Ti-C-1.0Y master alloy. Al3Y with dendritic morphology and small blocky Al2Y except for TiC are found in Al-Ti-C-2-0Y master alloy. 相似文献
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利用粉末冶金法制备TiB2和TiC复合材料熔敷棒,并通过电火花沉积在点焊镀锌钢板用电极的表面制备TiB2和TiC复合涂层。利用SEM和XRD分析涂层的微观结构和物相,运用点焊实验测试涂层电极的使用寿命。结果表明:复合材料熔敷棒中TiB2和TiC颗粒细小均匀,电火花涂层致密无分层,涂层物相为Cu、TiB2和TiC;Cu从基体扩散到涂层表面,涂层表面Cu含量(原子分数)达到28%,过渡层出现Cu和Ti的梯度分布,涂层与基体间为牢固的冶金结合;复合涂层存在少量裂纹,其显微硬度达到850HV,高于TiB2涂层和TiC涂层硬度;点焊时电极头部的平均磨损率大大降低,电极的点焊寿命比无涂层电极提高4倍。 相似文献
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在钛合金表面激光熔覆制备TiC/TiB2复合涂层,分别采用SEM、显微硬度计和摩擦磨损设备分析了TiB2+15%TiC复合涂层的微观组织和硬度、摩擦磨损性能。实验结果表明:涂层上部组织主要由粗大的TiB2树枝晶和少量白色颗粒状的TiC/TiB共晶组织组成,涂层中部组织主要由棒状型、细针状型的TiB2相和小块状的TiC相组成,涂层下部则由树枝型、块状TiB2相、较大的片状TiC相和少量的小层片状金属间化合物TiAl组成。由测试结果可知,涂层硬度(960HV0.2)约为基体的(350HV0.2)的2.7倍。涂层的耐磨性能显著提高,涂层出现较少的剥落、细小磨痕和颗粒碎屑,基体表面主要是犁沟式的磨损。涂层的磨损量为1.132 mg是基体(5.342 mg)的20%。 相似文献
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Z. P. Xing Y. F. Han J. T. Guo L. G. Yu 《Metallurgical and Materials Transactions A》1997,28(4):1079-1087
The microstructure, interfaces, and mechanical properties of NiAl-matrix composites reinforced by 0 and 20 vol pct TiC particles
have been examined. The composites were prepared by the hot-pressaided exothermic synthesis (HPES) technique. Portions of
the HPES-processed samples were hot isostatically pressed (“hipped”) at 1165 °C/150 MPa for 4 hours or annealed at 1400 °C
for 48 hours. In the as-fabricated state, TiC particles were generally polygonal and faceted, and the interfaces between TiC
and NiAl were atomically flat, sharp, and generally free from any interfacial phase. At least two orientation relationships
between TiC and NiAl were observed. In some cases, thin amorphous layers existed at NiAl/TiC interfaces. After “Hipping,”
the TiC particles tended to become round and the TiC/NiAl interfaces became overlapped. Annealing at 1400 °C for 48 hours
did not affect the microstructure or the interfacial structure of the composite in most cases. The compressive yield strengths
(YSs) from room temperature to 1100 °C of the composite were considerably higher than that of the monolithic NiAl. At 980
°C, the tensile YS of the composite was approximately 3 times that of the monolithic NiAl. In addition, the ambient fracture
toughness of the composite was 50 pct higher than that of the monolithic NiAl. 相似文献