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zr
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    Effects of Trace Mg and Zr on Service Performance of GH4133B Turbine Disk
    微量镁和对GH4133B合金缺口持久及低周疲劳性能影响
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    TBT Solvent Extraction and Separation of Zr & Hf in Mixed Acid System
    混合酸系统磷酸三丁酯萃取分离
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    Influence of Minor Zr on Mechanical Properties and Microstructures of Al-Mg-Sc Alloy
    微量对Al-Mg-Sc合金力学性能与显微组织的影响
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    Influence of Zr and Ti on slow cooling brittleness of QAl_(10-4-4) aluminum bronze
    及钛对QAl_(10-4-4)铝青铜缓冷脆性的影响
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    Application of element Zr in aluminum alloys
    元素在铝合金中的应用
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    EFFECTS OF P, Zr AND B ON MICROSTRUCTURE AND SEGREGATION OF DIRECTIONALLY SOLIDIFIED IN738 SUPERALLOY
    P,Zr,B对定向凝固IN738合金组织和偏析的影响
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    Study on the Magnetometer Characteristic of Amorphous Co_(78)Cr_(12)Zr_(10) Alloy Magnetic-core
    非晶态Co_(78)Cr_(12)Zr_(10)合金带磁芯的磁强计特性研究
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    STUDY ON THE CORRELATION BETWEEN MECHANICAL BEHAVIOR AND MICROSTRUCTURAL CHANGE IN A WARM-ROLLED Al-8Mg-0.2Zr ALLOY DURING SUPERPLASTIC DEFORMATION
    温轧态Al─8Mg─0.2Zr合金超塑变形过程中力学行为和微观组织相关性研究
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    CHARACTERIZATION OF THREE-PHASE CERAMIC COMPOSITE(Ti,Zr)N
    三相(Ti,Zr)N复合陶瓷的物相分析
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    EFFECTS OF Zr ON GRAIN BOUNDARY AND MECHANICAL PROPERTIES IN Ni_3Al ALLOYS
    Zr对Ni_3Al晶界及力学性能的影响
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  zr
Lead zirconium titanate (PZT) films (Zr/Ti=45:55) with a high dielectric constant are prepared successfully on the low-resistance Si substrate in sol-gel dip-coating process with PT film used as the buffer layer.
      
The solid acids were prepared by mounting H2SO4 on TiO2 · nH2O and Zr(OH)4, respectively, followed by calcining at 823K.
      
To deal with this contradictory situation, insolvable zirconium tricarboxybutylphosphonate (Zr(PBTC)) powder was employed to make a composite with SPEEK polymer in an attempt to improve temperature tolerance of the membranes.
      
SPEEK/Zr(PBTC) composite membranes were obtained by casting a homogeneous mixture of Zr(PBTC) and SPEEK in N,N-dimethylacetamide on a glass plate and then evaporating the solvent at 60°C.
      
Results showed significant improvement not only in temperature tolerance, but also in methanol resistance of the SPEEK/Zr(PBTC) composite membranes.
      
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There were three prevailling calculation methods of gear tooth scuffing, i.e. methods of flash-point, integral temperature and minimum film thickness. In general, mordern machines tend to be small size, light weight and high speed. It leads the stress of tooth surface up to 16,000~30,000 kgf/cm2 and circumferential speed over 150m/s and tooth surface temperature at least higher than 300℃. Under such a severe condition, the absorbing film has already been broken down and the ratio of film thickness X is only...

There were three prevailling calculation methods of gear tooth scuffing, i.e. methods of flash-point, integral temperature and minimum film thickness. In general, mordern machines tend to be small size, light weight and high speed. It leads the stress of tooth surface up to 16,000~30,000 kgf/cm2 and circumferential speed over 150m/s and tooth surface temperature at least higher than 300℃. Under such a severe condition, the absorbing film has already been broken down and the ratio of film thickness X is only 2 at most even less than 1 sometimes. For this reason, various extreme-pressure lubricants containing additives have been developed and widely used in gear lubrication. It follows that the three methods as above become improper nowadays since a large amount of additive-containing lubricants was used. It is time to study further and find out the new criterion and method for tooth scuffing calculation based on a detailed analysis of earlier works about that.Summary. In the three methods pointed out above, the former two are both mainly to control the transient tooth surface temperature in order not to exceed the absorbing temperature of lubricant(about 200℃ in common case), whereas the latter is mainly to ensure that using lubricant film to seperate the two contacting surfaces with a ratio of film thickness A greater than 3. Analyzing some earlier works, this paper presents a new method for calculating tooth scuffing. The following; factors are considered as of importance in tooth scuffing: contact stress σH, sliding velocity vs = v1-v2(tangential velocities of tooth 1 and 2 resp.), rolling velocity v = v1+v2, surface finish of tooth, sort of lubricant and lubrication mode, material of gear and tooth surface property etc. In accordance to the relevant symbols and formulae specified in ISO Standard about tooth strength calculation as much as possible, the formula to calculate tooth scuffing isσH= σspIn this formula, the contact stress σH can be determined similarly to fatigue strength and σsp is the permissible tooth scuffing limit, where σs i:m--measured tooth scuffing limit of tested gear,σs lim. Vsa= const;Ss lim --minimum safety factor in scuffing;ZL--lubrication coefficient;ZR--surface condition coefficient;Zv--rolling velocity coefficient;Zm---surface property coefficient due to gear material;a--constant;vs--siding coefficient.Fig. 1 Critical contact temperaturue of mineral oil without additive and hardened steel[1] Fig. 2 Relationship between calculated lubricant film thickness andsurface temperature in scuffing[7] Fig. 3 Effect of the concentration of ZDTP on ultimate scuffingstrength[8]Fig. 4 The as i,m'. -vs curve Tab.1 Property of base oilcfn

本文根据已发表的实验数据,论证闪温法,积分温度法和最小油膜厚度法在大量使用添加剂的今天已不适用。指出应根据变化了情况研究新的胶合计算准则和方法,并提出了新的看法和计算公式。

ffect of Zr addition on the property stability of CuZnAl alloy was investigated. It showed. Zr- doped could reduce martensite stabilization trend and improve property stability in the mid-temperature. X-ray diffraction results showed that Zr restrained the variation of order parameter and the formation of equilibrium phase when the alloy aged in the mid-temperature.This might have relation with the change of excess vacancy concentration which resulted from grain refining.

研究了Zr对CuZnAl记忆合金性能稳定性的影响。结果表明:Zr可降低马氏体稳定化倾向,并使合金的中温稳定性增强。X射线衍射证实,中温时效时,Zr的加入抑制合金中马氏体有序度的下降与平衡相的析出,这可能与晶粒细化导致过饱和空位浓度的改变有关。

he cold deformation and low temperature annealing textures in Zr-2.5wt%Nb sheet were measured,the realated texture coefficientes were computed.The realation of texture with procedure are discussed. The resultes show that the larger the cold deformation texture,the more intense the texture.That cold deformation texture become stronger at 400℃ annealing is believed to result from the perfection of preferred orientation subgrains during annealing recovery.

测定了锆-2.5Wt%铌合金在冷变形量为20%,50%及400℃退火后的板织构,计算了织构系数,讨论了织构形成、发展与工艺的关系。结果表明,冷加工变形量越大,织构越强烈;冷加工变形织构在400℃/24h退火后不仅不会消失,反而会得到加强,这是由于择优取向的亚晶在退火回复过程中变得更加完整的原因。

 
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