Metal–Nonmetal Transition in Rubidium Tungsten Bronze RbxWOy

An oxygen concentration dependent metal–nonmetal (MN) transition was observed for Rb_0.23WO _y with 2.80 < y < 3.08. As 2.80 < y < 3.0, the room temperature resistivity (_RT) of the Rb_0.23WO _y is about 5 × 10^–4 cm. While in the case of y > 3.04, the _RT of the Rb_0.23WO _y exhibits a four orders of magnitude increase with a value of 5 cm. Correspondingly, the lattice constant along c-direction slightly shortens as oxygen concentration increases from 2.80 to 3.08. The observed results suggest that the hybridization between W 5d (t_2g) and O 2p orbitals might be responsible for the MN transition. In addition, similar measurements were performed for Rb _x WO_3.04 and Rb _x WO_2.85 with 0.19 < x < 0.27. No rubidium concentration dependent MN transition was observed, indicating the electronic structure of the host WO _y is not modified significantly by varying the soluble rubidium concentration.     

铍青铜的热处理

铍青铜具有良好的力学性能,弹性,导电、导热性能,以及无磁性,耐寒、耐磨、耐蚀等。铍青铜的性能主要取决于热处理包括固溶和时效处理。铍青铜零件固溶处理应在木炭、氨分解气或酒精裂解气等保护介质中进行。时效也是铍青铜的一道重要热处理工序,包括欠时效,正常时效,过时效及改进的分步时效、双重时效等。介绍了常用铍青铜的化学成分及其经不同工艺热处理后的组织和性能。     

巴蜀兵器虎图形性质新说

对虎图形的性质，学术界长期以来存在多种观点。这些观点有其出现时代的合理性，但随着虎图形兵器材料的增加和对巴蜀文化研究的不断深入，其缺陷逐渐暴露出来。通过对学术界图腾说、族徽说、文字说、虎神说4种主要观点的分析，倾向于认为兵器上的虎图形是春秋战国时期特有的，一种巫术色彩浓郁的虎神崇拜的体现，与当时的军事集团有很大关系；虎图形的主要性质一是虎神，二是在图形符号组合中表现出来的图语性质。     

铜镜黑漆古表层的结构

具有黑漆古褐漆古表层的８种铜镜样品表面Ｘ射线衍射分析（ＸＲＤＡ）结果表明，在相近的２θ角位置上都有４～５个较宽的弥散峰，而基体的ＸＲＤＡ结果都无弥散峰。结果表明弥散峰是样品表层中具有３～５ｎｍ的ＳｎＯ２微晶所引起的。而已穿透腐蚀的黑漆古铜镜残片研细的ＸＲＤＡ结果尚具有基体的强衍射峰，表明黑漆古表层不单含有金属氧化物（主要是ＳｎＯ２），还存在未被腐蚀而被ＳｎＯ２所包裹的原合金大小不等的颗粒。     

铍青铜倾角传感器及其线性度补偿

用弹性较好的铍青铜材料作为振动元件,设计制作了“三明治”式差动电容检测结构的倾角传感器、给出敏感头结构尺寸,利用弹性力学分析了传感器的力学特性,推导出被测倾角和铍青铜元件偏角的关系。使用单片机,通过软件线性度补偿,提高了倾角传感器的输出线性度。该传感器结构简单,成本低,稳定性好,使用方便,并经过在全量程范围内测试,最大误差为6°。     

固溶时效处理对QCr1铸件性能的影响

研究了固溶及时效处理对铬青铜QCr1铸件力学性能及电导率的影响.研究结果表明,固溶温度不应超过1 030℃,时效处理后强度随时间先升后降,时效温度越高,可达到的强度峰值的时间越短,峰值强度越低.优化后的规范使QCrl铸件的强度及电导率均满足DIN系列相关标准要求.     

Metallurgical and tribological investigations of aluminium bronze bushes made by a novel centrifugal casting technique

Aluminium bronzes have been used as high strength, corrosion and wear resistance alloys for many decades. However, the alloy has a narrow solidification range and a complex nature which has confined its use to a limited field of applications. Published data on the wear characteristics and the metallurgical nature of the alloy system is limited, leaving wide possibilities for research. In the work described in this paper a study has been made of the metallurgical and tribological characteristics of aluminium bronzes conforming to BS 1400 AB2 specification. A novel centrifugal casting technique using a bonded sand lining integrated into a standard rotating die was adapted to cast a series of test bushes. Mechanical and microscopic aspects are studied and an attempt is made to correlate the physical properties with the tribological behaviour of the bushes. The results show that the test behaviour of the test bush was in some respects better than that of commercially produced bushes made by forging techniques. Detrimental embrittlement, due to ‘self annealing’ is significantly reduced by the adoption of the novel centrifugal casting technique referred to above.     

高频拉铸工艺对锡磷青铜铸坯品质的影响

研究了生产锡磷青铜采用短节距、高频率以及二次反推的牵引制度的高频拉铸工艺.结果表明:高频拉铸工艺可以细化铸锭晶粒、减少成分偏析和枝晶偏析,得到成分均一、组织均匀的优良铸锭,可减少后续加工的缺陷发生率,提高了生产效率.     

新型Cu-Ni-Cr-Al合金性能的研究

通过对新型Cu-Ni-Cr-Al合金成分的配料控制,研究的铜合金平均弹性极限σ0.005为1062MPa;1和100h的弹性稳定性指标分别达到99.6%和99.2%;使用弹性材料制作的元件具有力-位移关系曲线的良好一致性;使用研制材料制作的元件进行长期弹性稳定性考核优良。     

雾化6—6—3青铜粉粒度组成对松装密度影响的研究

采用正交试验研究方法,探讨了６－６－３雾化青铜粉末粒度组成对其松装密度影响规律,得出了３００目以下细粉对松装密度影响最显著的结论,并指交小的变化范围内通过调整粉末体的粒度组成,可以到调整粉末体松装密度的目的。