Ti（C,N）基金属陶瓷的抗热冲击性能

对Ｔｉ（Ｃ，Ｎ）基金属陶瓷的热冲击性能进行了研究。结果表明，热冲击图（σｒｂ－ｔ图）存在一个突变点，即当ｔ＞４００℃时，σｒｂ急剧下降。扫描电镜观察表明，试样表面存在裂纹，在试样的亚表层下存在孔洞。从而探讨了微孔洞的形成机理。     

Mo、Ni含量与Ti(C,N)基金属陶瓷组织和性能之间的关系

本文研究了Mo、Ni含量对Ti（C，N）基金属陶瓷组织和性能的影响．结果表明，Mo、Ni含量对组织和性能有很大影响，化学成分决定了组织和性能．     

Ti(C,N)基金属陶瓷的耐腐蚀性

研究了Ti（C,N）基金属陶瓷在5％HNO3、50％NaOH溶液中的耐腐蚀性能,对比了金属陶瓷与YG8硬质合金在同种腐蚀介质中的耐蚀性优劣,并对金属陶瓷在5％HNO3溶液中的腐蚀形貌进行观察。试验结果表明：金属陶瓷有良好的耐酸碱腐蚀性能,其耐蚀性与粘结相的含量密切相关,粘结相的含量愈低,耐蚀性愈好;金属陶瓷的耐蚀性明显优于YG8硬质合金;金属陶瓷的腐蚀机理为钝化膜保护的电化学腐蚀。     

Ti(C,N)基金属陶瓷的高温力学性能

此文评述了Ti（C，N）基金属陶瓷的组织与制备工艺，重点讨论了Ti（C，N）基金属陶瓷的高温力学性能，并展望其应用前景．     

Ti(C,N)金属陶瓷中的添加剂

本文就添加剂对Ti（C，N）金属陶瓷机械性能的影响及其在Ti（C，N）金属陶瓷中的分布作了详细的阐述，并就Ti（C，N）金属陶瓷作模具材料的可能性进行了讨论。     

EFFECT OF RARE EARTH ELEMENT Er ON STRENGTHENING OF INTERFACE OF Ti（C，N） BASED CERMETS

ＥＦＦＥＣＴＯＦＲＡＲＥＥＡＲＴＨＥＬＥＭＥＮＴＥｒＯＮＳＴＲＥＮＧＴＨＥＮＩＮＧＯＦＩＮＴＥＲＦＡＣＥＯＦＴｉ（Ｃ，Ｎ）ＢＡＳＥＤＣＥＲＭＥＴＳ￥ＬｉｕＮｉｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｅｒｉｎｇ，...     

Ti(C,N)基金属陶瓷中η相的组织研究

研究了Ti（C，N）基金属陶瓷中η相的组织形态和成份．结果指出，η相中存在微裂纹，对金属陶瓷的力学性能有害，η相中可用分子式（Ni，W，Mo）3（Ti，W，Mo）来表示．     

纳米Ti(C,N)增强Ti(C,N)基金属陶瓷的研究

采用纳米Ti(C,N)粉末制备Ti(C,N)基金属陶瓷,研究了纳米粉末对金属陶瓷组织及性能的影响。结果表明,粉末冶金过程中,纳米Ti(C,N)粉末易于在粘结相中扩散与溶解及沿晶界分布,降低了硬质相在粘结相中的溶解度,抑制了晶粒长大,提高了材料的红硬性能。抗弯强度与晶粒尺寸满足于Hall-Perch公式,5wt％～l0wt％的纳米粉末加入量可使金属陶瓷的抗弯强度和切削性能得到较大的提高,但硬度变化不大。切削磨损主要表现为磨粒磨损和轻微的粘着磨损,磨痕细小均匀。     

TiN及WC加入量对Ti(C,N)基金属陶瓷组织与性能的影响

本文研究了TiN及WC加入量对金属陶瓷组织和性能的影响．结果表明，随TiN加入量的增加，组织细化，WC形成TiC－WC固溶体的临界加入量约为15％，超过15％时将使部分WC以针状或针片状形式存在，使硬度降低．     

化学成分对Ti(C,N)基金属陶瓷力学性能的影响

研究了化学成分对金属陶瓷硬度和抗弯强度的影响,结果表明,Mo含量在15％、WC含量在10％时硬度最高;随WC加入量的增加．抗弯强度呈现单调增加的趋势;组织中加入NbC、TaC时．随加入量的增加．抗弯强度呈单调下降趋势。     

(Ti,W,Ta)(C,N)_p/Ti(C,N)基金属陶瓷的组织与性能

采用自制的多元复式碳氮化物陶瓷粉末 ((Ti,W,Ta) (C,N) p)制备 (Ti,W,Ta) (C,N) p/Ti(C,N)基金属陶瓷。研究了 (Ti,W,Ta) (C,N) p 粉末的组织结构特征及其加入对金属陶瓷的组织及性能的影响。结果表明 ,多元复式碳氮化物粉末的晶格常数与元素的固溶度有很好的对应关系 ,调整粉末中元素的固溶度可控制粉末的晶格常数 ,进而控制材料的性能。 Ti(C,N)基金属陶瓷中 (Ti,W,Ta) (C,N) p 粉末的加入 ,有利于重金属元素 W和 Ta向粘结相中扩散 ,从而降低了硬质相在粘结相中的溶解度 ,阻碍了晶粒长大。(Ti,W,Ta) (C,N) p/Ti(C,N)基金属陶瓷各项性能指标优于 Ti(C,N)基金属陶瓷和国外对应的金属陶瓷牌号 CT5 2 5的产品。强化机制主要表现为细晶强化与固溶强化。     

Microstructure and cutting performance of Ti（C, N）-based cermets heat-treated in nitrogen

Ti（C, N）-based cermets were treated using hot isostatic pressing （HIP） at 1423 K in nitrogen. The microstructures compared with the as-sintered cermets were investigated using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray analysis, and electron microprobe analysis. It was found that high nitrogen activity in the surface zone resulted in the formation of gradient structure. Approximately 20-1am-deep, nitrogen-rich and titanium-rich hard surface zone was introduced by the heat treatment. The nitrogen activity was the driving force that caused the transportation of the atoms through the binder, titanium towards the surface, and tungsten and molybdenum inwards. In the surface zone, the particle size became fine, the inner rim disappeared, and the volume fraction of the outer rim and the binder phase considerably reduced. Small grains of TiN, WC, Mo2C, and nitrogen-rich carbonitlide phases formed in the surface zone during the heat treatment, improving the tlibological property of the heat-treated cermet.     

Effects of molybdenum on the microstructure and mechanical properties of Ti（C,N）-based cermets with low Ni

The effects of Mo on the microstructure and mechanical properties of Ti（C,N）-based cermets with low Ni have been studied systematically. Different contents of Mo （4-12 wt.%） were added into Tl（C,N）-based cermets. Specimens were fabricated by conventional powder metallurgy and vacuum sintered at temperatures of 1440, 1450, and 1460℃ individually. The microstructure and fracture morphology were investigated by scanning electron microscope, and the mechanical properties such as transverse strength and hardness were measured. The results show that the microstructure is uniform and the thickness of rim phase is moderate when the content of Mo is 8 wt.%; the mechanical properties of the specimens sintered at 1450℃ are better than those sintered at 1440 and 1460℃. The integrated properties of transverse strength and hardness are the best when the content of Mo is 8 wt.% and the sintering temperature is 1450℃.     

Ti(C, N) BASED CERAMETS AND ITS FRACTAL ANALYSIS OF FRACTURE SURFACES

Ｔｉ（Ｃ，Ｎ）ＢＡＳＥＤＣＥＲＡＭＥＴＳＡＮＤＩＴＳＦＲＡＣＴＡＬＡＮＡＬＹＳＩＳＯＦＦＲＡＣＴＵＲＥＳＵＲＦＡＣＥＳＬｉｕＮｉｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｅｒｉｎｇ，Ａｎｈｕｉｉｎｓｔｉｔｕｔｅｏ...     

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF (Nb, Ti)C NICKEL BASE SUPERALLOY

ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＡＮＤＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＯＦ（Ｎｂ,Ｔｉ）ＣＮＩＣＫＥＬＢＡＳＥＳＵＰＥＲＡＬＬＯＹ①ＣａｉＫｅｆｅｎｇ,ＮａｎＣｅｗｅｎａｎｄＭｉｎＸｉｎｍｉｎＳｔａｔｅＫｅｙＬａｂｏｒａｔｏｒｙｏｆＡｄｖａｎｃ...     

Evolution of Ti （C, N）-based cermet microstructures

Two series of Ti(C, N)-based cermet materials originating from the same chemical composition but with dif-ferent grain size distribution and sintered to different stages of the sintering cycle have been studied using SEM, TEM,EDX, and XRD. Much of the surrounding structure is formed during solid state sintering. During the solid state sintering, at first, the Mo and W rich (Ti, Mo, W)C inner rim is formed by the interaction among TiC, WC, and Mo2C; then the Mo and W lean (Ti, Mo, W)(C, N)outer rim is formed. During the liquid phase sintering, the outer rim of coarse grains grows rapidly throw a solution-reprecipitation process; aLso coarse grains grow by particle coalescence. The interface between coarse grain outer rim and binder is flat (crystal surface).     

Ti(C,N)基金属陶瓷与45号钢钎焊的试验研究

在氩气保护炉中，采用铜基、银基钎料对Ti(C，N)基金属陶瓷与45钢进行钎焊试验。通过观察和分析钎焊接头的结合情况及剪切试验，表明Ti(C，N)基金属陶瓷具有较好的钎焊性；氩气保护焊条件下，以H62为钎料的接头的平均剪切强度为37MPa，以Ag72Cu28为钎料的接头的平均剪切强度为51MPa。     

第二相碳化物对Ti(C,N)基金属陶瓷组织和性能的影响

简要介绍了Ti(C,N)基金属陶瓷的基本结构,重点阐述了第二相碳化物对Ti(C,N)基金属陶瓷的组织结构和力学性能的影响。     

Ni/Ti(C,N)包覆粉及其金属陶瓷的制备

采用非均相沉淀-热还原法制备Ni/Ti(C,N)包覆粉,并用该包覆粉经真空烧结制得金属陶瓷。利用扫描电镜、电子能谱、X-射线衍射等手段研究包覆粉的结构形貌及烧结后的微观组织与性能。结果表明:非均相沉淀过程中,非晶态的NiCO3·2Ni(OH)2·2H2O在Ti(C,N)颗粒表面成核并生长;经热还原过程后,NiCO3·2Ni(OH)2·2H2O分解并完全还原成Ni,Ni的平均晶粒尺寸约为50nm;采用包覆粉为原料制备金属陶瓷,有效改善了硬质相和粘结相的分布均匀性,但包覆粉烧结过程中存在晶粒长大现象;金属陶瓷的相成分为纯净的Ti(C,N)与Ni两相;金属陶瓷的综合性能相对于传统工艺制得的金属陶瓷有一定提高。     

TiN对Ti(C,N)基金属陶瓷组织和性能的影响

研究了含Ni量很高的Ti（C，N）基金属陶瓷中TiN在烧结时的变化，及不同的TiN添加量对最终烧结体的N含量、组织和性能的影响。为Ti（C，N）基金属陶瓷的成分设计、烧结工艺的制定提供了一定的依据。