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金属陶瓷复合塑料切粒刀的研制及应用 总被引:6,自引:0,他引:6
研究了TiC-NiCr金属陶瓷在塑料切粒刀上的应用。这种切粒刀结构特点是金属陶瓷刀刃与钢刀体通过高温真空扩散焊复合为一体。结果表明这种金属陶瓷复合切粒刀性能比钢结硬质合金切粒刀更好。 相似文献
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使用化学复合镀工艺获得了Ni-P-SiC金属陶瓷镀层材料,镀层中SiC质点分布均匀,利用差热分析曲线讨论了可获得的好耐磨性能热处理制度,比较了Ni-P-SiC和Ni-P镀层的硬度和耐磨性能。 相似文献
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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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在反庆物(C/Ti=0.45,原子比)内添加TaC后,燃烧合成的金属陶瓷中过剩Ti相比例增加,非化学计量碳化钛晶粒尺寸减小。添加TaC使金属陶瓷的抗弯强度和硬 度增加,金属陶瓷的密度也随TaC添加量增加而增大。 相似文献
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本文论述了炉渣碱度、渣中(Cr2O3)含量、加Ti前的温度及Ti-Fe粒度等对VOD精炼1Cr18Ni9Ti钢Ti的收得率的影响。 相似文献
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本文论述了炉渣碱度、渣中(Cr2O3)含量、加钛铁前的温度及Fe-Ti粒度等对VOD精炼1Cr18Ni9Ti钢Ti的收得率的影响。 相似文献
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添加剂对Cr2O3—Al系SHS反应的影响 总被引:9,自引:0,他引:9
研究了添加CrO3-Al、Fe2O3-Al+MgO及Ti-C的Cr2O3-Al系的燃烧特性。实验发现,添加CrO3-Al、Fe2O3-Al+MgO时,自蔓燃反应易于引发;体系中混入Ti-C添加剂对反应引发不利,但在用纯Ti-C作引火剂情况下可以引发。随着CrO3-Al添加量的增加,燃烧温度升高,但添加量大于20%时,燃烧温度反而下降。燃烧温度随Fe2O3-Al+MgO添加量的增加而升高。Ti-C添加量的增大对燃烧温度影响不大。燃烧速度随以上添加剂量的增大而增大 相似文献
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Viscosity of soda-lime-silicate glass doped with rare earth oxides(Pr6O11,Eu2O3,Yb2O3) was investigated by the rotating crucible viscometer,the melting temperature and activation energy for viscous flow of the studied melt were derived on the basis of the Arrhenius Equation,the coefficient of thermal expansion,glass transition temperature and dilatometric softening temperature were also determined with dilatometry,in order to reveal the effects of rare earth elements on the behavior of soda-lime-silicate glass.The results showed that introduction of rare earth oxides decreased the viscosity of soda-lime-silicate glass and melting temperature of corresponding melt,increased coefficient of thermal expansion of soda-lime-silicate glass.The glass transition temperature,dilatometric softening temperature,and melting temperature of soda-lime-silicate glass doped with rare earth oxides increased with increasing cationic field strength of corresponding rare earth ions. 相似文献
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采用NETZSCH DIL 402C高温热膨胀仪对三种不同化学成分的钢种在30-1150℃温度范围内的热膨胀特性进行了测量,得到线性热膨胀和瞬时线膨胀系数随温度的变化曲线。对实测的热膨胀值进行定量计算和对比分析后发现,钢在加热过程中的线性热膨胀及瞬时线膨胀系数随温度的变化过程可分为室温至相变区、固态相变区和高温奥氏体区三个阶段,每个阶段碳含量对热膨胀的影响程度不同。在整个升温过程中,物理热效应引起的热膨胀占主导作用,不同钢种的物理热膨胀总量基本相同,而相变引起的收缩量大约占整个膨胀绝对变化量的16%,且收缩总量随碳含量的增加而减少,导致最终不同钢种试样的膨胀量不同。 相似文献
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Viscosity of soda-lime-silicate glass doped with rare earth oxides (Pr6O11, Eu2O3, Yb2O3) was investigated by the rotating crucible viscometer, the melting temperature and activation energy for viscous flow of the studied melt were derived on the basis of the Arrhenius Equation, the coefficient of thermal expansion, glass transition temperature and dilatometric softening temperature were also determined with dilatometry, in order to reveal the effects of rare earth elements on the behavior of soda-lime-silicate glass. The results showed that introduction of rare earth oxides decreased the viscosity of soda-lime-silicate glass and melting temperature of corresponding melt, increased coefficient of thermal expansion of soda-lime-silicate glass. The glass transition temperature, dilatometric softening temperature, and melting temperature of soda-lime-silicate glass doped with rare earth oxides increased with increasing cationic field strength of corresponding rare earth ions. 相似文献
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G. V. Samsonov I. V. Bogomol S. N. L'vov M. I. Lesnaya 《Powder Metallurgy and Metal Ceramics》1972,11(11):910-912
Conclusions The thermal conductivity of TiC-Nb, TiC-Ta, TiC-Mo, and TiC-W cermets with metal contents of 25, 50, and 75 at.% was investigated at temperatures ranging from 20 to 1100°C. The thermal conductivity of the cermets was found to be much less than that of their metallic constituents. It was established that, at constant temperature, the thermal conductivity of the cermets increases in the order TiC-Nb< TiC-Ta相似文献
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以NiCrAlY和Y2O3粉末为原料通过两种工艺分别制备出团聚烧结和混合型NiCrAlY-Y2O3金属陶瓷粉末,研究了该两种用于热喷涂给料粉末的颗粒形貌及粉末性能.使用该两种粉末及一种商用CoCrAlY-Y2O3通过超音速火焰喷涂(HVOF)在不锈钢基体上制备厚度约为100um的涂层。研究了涂层的孔隙率及抗热冲击能,将四种热喷涂涂层在高温下与MnO,Fe3O4及含锰碳钢进行接触反应后对它们的抗结瘤性能进行了相对的静态比较,结果表明,团聚烧结NiCrAlY-Y2O3涂层具有较好的抗锰氧化物的结瘤,而抗铁氧化物结瘤性能差。团聚烧结金属陶瓷涂层比混合型陶瓷涂层具有更好的抗氧化物结瘤性能。 相似文献
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《粉末冶金学》2013,56(1-2):189-226
AbstractIt has been recognized for some time that, with progressive increase in the working temperature of gas turbines, metallic alloys may no longer be adequate for rotor or stator blading. The use of more refractory but more brittle materials, i.e. ceramics and ceramic-metal mixtures (cermets) has been suggested. The paper is concerned with the evaluation of the major properties involved, viz. creep strength, fatigue strength, resistance to thermal fatigue (i.e. to repeated thermal shocks), oxidation-resistance, and impact-resistance. The materials evaluated include oxides, oxide–metal cermets, carbides, carbide-metal cermets, molybdenum disilicide, and silicon nitride. The equipment for determining the effects of alternating and steady mechanical stresses up to 1200° C. is described. The relative merits of the test materials are discussed. It is concluded that the resistance to thermal fatigue and to impact of the ceramics and cermets is inferior to that of metallic alloys in current use. 相似文献
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铝电解槽阳极组装用磷生铁在使用过程中需要的特性与其本体材料的物理性能息息相关。运用材料热力学的方法计算出五大元素(C,Si,P,Mn,S)的含量变化对磷生铁电导率和热膨胀系数的影响,并通过线性回归建立电导率和热膨胀系数与五大元素含量和温度的函数关系,最后利用线性规划最优化算法对某铝厂现行磷生铁成分进行有目的性的优化。通过优化后,磷生铁电导率最大优化率为14.50%,热膨胀系数最大优化率为5.99%。 相似文献