铂氧化铁电极在硼酸-四硼酸钠溶液中的阴极过程

用动电位法研究了铂氧化铁(Fe_3O_4,α-Fe_2O_3,γ-Fe_2O_3)电极在不同pH的H_3BO_3-Na_2B_4O_7水溶液中的阴极过程。对脱氧溶液中,较低过电位区域出现异常的Tafel常数,作者从电极过程动力学分析确认这-反应是氧化铁的固相还原反应。讨论了溶液pH对氧化铁还原反应速率的影响和氧化铁铁锈在腐蚀过程中的作用。     

铂类抗肿瘤药物甲啶铂的水合反应研究

采用高效液相色谱研究了抗肿瘤药物甲啶铂的水合反应,以及甲啶铂在0.9%NaCl溶液中的稳定性。结果表明,甲啶铂的水合反应遵循一级反应动力学规律,20℃时反应速率常数为k=0.03086h-1,半衰期22.5 h,反应活化能E=80.6 kJ/mol;在0.9%NaCl溶液中,甲啶铂的水合反应被抑制,反应达到平衡后,甲啶铂的降解不超过4%。     

草酸环己二胺铂的热水合动力学研究

采用电导法研究草酸环己二胺铂在水介质和５％葡萄糖介质中的稳定性。给出了草酸环己二胺在这两种介质中的摩尔电导与时间的变化关系。结果表明：在２５℃时该化合物在水和５％葡萄糖介质中的热水合常数分别为６．８×１０￣（－６）ｍｉｎ￣（－１）及７．７×１０￣（－６）ｍｉｎ￣（－１）。     

顺铂水溶液行为的初步考察

用紫外光谱和薄层色谱研究顺铂的水溶液行为。实验表明:顺铂在生理盐水溶液中避光比敞光稳定,在5%的葡萄糖溶液中容易发生水解,在2.5～5.0%二甲基亚砜的生理盐水溶液中易生成无抗癌活性的铂—二甲基亚砜络合物。建议临床上以生理食盐水作为顺铂的溶剂,以便提高疗效,降低毒副作用。     

酸度在抗癌新药卡铂光反应中之应用

用高效液相色谱研究卡铂的酸性溶液在３１３ｎｍ紫外光作用下的光化学反应，测定反应产物和量子产率。结果表明酸度在卡铂的光反应中起重要作用。还讨论酸度的作用机制。     

酸度在抗癌新药卡铂光反应中之作用

用高效液相色谱法研究卡铂的酸性溶液在３１３ｎｍ紫外光作用下的光化学反应，测定反应产物和量子产率。结果表明酸度在卡铂的光反应中起重要作用。还讨论酸度的作用机制。     

掺废渣混凝土抗冻融性能的超声检测

用超声波法检测了掺废渣混凝土在水溶液、3．5％氯化钠溶液以及3．5％氯化钠与5．0％硫酸钠复合溶液中冻融前后的声速变化。结果表明，生态混凝土在氯化钠溶液中冻融循环的质量损失比水和复合溶液中冻融循环的质量损失大，氯化钠溶液对生态混凝土冻融循环产生的剥蚀是不能忽略的；声速变化比质量损失变化明显，说明超声波法是一种检测混凝土冻融损伤的简单可靠的方法。     

敏化态304不锈钢在室温下发生应力腐蚀的Cl~-浓度界限

用慢应变速率实验技术研究了敏化态304不锈钢在室温氯化钠溶液中的应力腐蚀行为。结果表明:敏化态304不锈钢在近中性的氯化物溶液中呈典型的沿晶应力腐蚀开裂,随Cl-浓度的提高,应力腐蚀开裂敏感性增强,应力腐蚀的发生存在一个临界Cl-浓度。关键词     

过渡金属取代磷钼酸修饰铂电极的电化学行为

在证实了磷钼酸修饰铂电极对甲醇氧化具有较高活性的基础上，合成了3种过渡金属取代的磷钼酸，通过红外光谱测试仍为Keggin结构，并制备了过渡金属取代磷钼酸修饰铂电极，研究了修饰铂电极在硫酸溶液中的电化学行为及对甲醇的催化氧化作用。研究结果表明，3种过渡金属取代的磷钼酸修饰铂电极均对甲醇氧化表现出较高的催化活性，其中锰取代的磷钼酸修饰电极对甲醇的催化活性最高。     

顺铂注射液的高效液相色谱分析

提出了测定顺铂注射液中顺铂含量的反相高效液相色谱法,其线性相关系数为0．994,精确度为0．45％（n＝8）,顺铂的回收率为99．7％。该法也能用于顺铂注射液中杂质反铂的测定,实现顺铂与水合物、三氯氨铂（铂B）的分离。提出了用氯化钠溶液替代空白溶剂（顺铂注射液所用的溶剂简称）作为顺铂对照品溶剂的可能性。     

Microstructure and Mechanical Properties of Unidirectional W Filament Reinforced Al-6Ti-6Nb and SiCp-Al-6Ti-6Nb Matrix Composites

1 ＩｎｔｒｏｄｕｃｔｉｏｎＡｌ Ｔｉ ＮｂａｌｌｏｙｓｓｙｓｔｅｍｉｓｒｅｇａｒｄｅｄａｓｏｎｅｏｆｔｈｅｒｅａｌｉｓｔｉｃｍａｔｒｉｃｅｓｔｏｐｒｅｐａｒｅＡｌｍａｔｒｉｘｃｏｍｐｏｓｉｔｅｓｗｉｔｈｇｏｏｄｔｈｅｒｍａｌｓｔａｂｉｌｉ ｔｙｆｏｒｉｔｓｇｏｏｄｔｈｅｒｍａｌｒｅｓｉｓｔａｎｃｅ[1].ＴｈｅｔｈｅｒｍａｌｒｅｓｉｓｔａｎｃｅａｎｄｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｓｔｒｅｎｇｔｈｏｆＡｌ 6Ｔｉ 6ＮｂｃｏｕｌｄｂｅｆｕｒｔｈｅｒｉｍｐｒｏｖｅｄｂｙｔｈｅａｄｄｉｔｉｏｎｏｆＳｉＣｐ[2 ],ｈ…     

Structural and magnetic properties of UFe6Ga6

UFe₆Ga₆ polycrystalline samples were prepared by arc-melting, and single crystals were grown by the Czochralski method. This compound crystallizes in the orthorhombic ScFe₆Ga₆-type structure (space group Immm, a=5.0560(4), b=8.5484(7) and c=8.6914(7) Å), an ordered variant of the ThMn₁₂-type structure. A ferromagnetic-type transition at T_C=530(5) K is seen in the magnetization and A.C.-susceptibility measurements, and no other magnetic anomaly is observed down to 5 K. Single crystal magnetization measurements along the three different crystallographic axes indicated a as the easy direction, with a spontaneous magnetization M_S=12.3 μ_B/f.u. at 5 K. The analysis of the ⁵⁷Fe Mössbauer spectroscopy data indicated magnetic hyperfine fields, B_hf, significantly lower on 4f sites than on 8k sites, in agreement with the trend already observed on UFe_xAl_12−x, where the average B_hf were found to increase with the iron–iron interatomic distances.     

Creep mechanism of as-cast Mg-6Al-6Nd alloy

The creep mechanism of as-cast Mg-6Al-6Nd alloy was studied. The stress exponent for creep is 5.8 under the applied stresses of 50–70 MPa at 175°C. The activation energy for creep is 189 kJ·mol⁻¹ under the applied stress of 70 MPa in the range of 150–200°C. The true stress exponent and threshold stress for creep are calculated as 4.96 and 10.2 MPa, respectively. The true stress exponent indicates that its creep mechanism belongs to the dislocation climb-controlled creep, which is in agreement with the microstructure changes before and after creep. The high value for stress exponent is attributed to the interaction of Al₁₁Nd₃ phase with dislocations. The activation energy is more than the self-diffusion activation energy of Mg, which is attributed to the load transfer taking place from the matrix to Al₁₁Nd₃ phase during creep.     

成型压力对盐助燃烧合成超细CeB6粉体粒度和纯度的影响及其作用机制

在B_2O_3-CeO_2-Mg体系中引入发热剂KClO_3,利用盐助燃烧法制备超细高纯度CeB_6粉体,研究成型压力对盐助燃烧合成超细CeB_6粉体粒度和纯度的影响。借用SEM、EDS、TEM和XRD探讨了盐助燃烧合成法制备CeB_6粉体的形成机理。结果表明,燃烧合成的主要产物为CeB_6,且随着成型压力的增大,浸出后产物的平均颗粒尺寸略微有增加,平均尺寸为0.830～0.930μm,整体粒度分布较为均匀;浸出产物的纯度随着成型压力的增加呈现出先增加后减小的趋势,当压力为20 MPa时,纯度达到最大值99.0%,但不同压力下各试样纯度均在98.0%以上。     

42CrV6

42CRV6是调质钢,具有高强度和高屈服点,综合力学性能比40Cr要好。良好的力学性能和工艺性能,淬透性较高,加人钒使钢的晶粒细化,降低过热敏感性,提高了强度和韧性,具有高的疲劳强度,屈服比也较高,但焊接性差,冷变形塑性低。可制作较高级的弹簧,用作较大截面的高负荷重要弹簧及工作温度〈300℃的阀门弹簧、活塞弹簧、安全阀弹簧。冷变形塑性和切削性均属中等,过热敏感性小。     

Diffusion bonding/superplastic forming of Ti-6Al-6V-2Sn/SUS 304 stainless steel/Ti-6Al-6V-2Sn

The superplasticity of the Ti- 6Al- 6V- 2Sn alloy for different temperatures was evaluated by single-sheet free blowing. The optimal superplastic temperature for the Ti- 6Al- 6V- 2Sn alloy was found to be 850 °C. Diffusion bonding of Ti- 6Al- 6V- 2Sn and 304 stainless steel was carried out in a vacuum. The interface of both bonded alloys was examined by EPMA. The concentration profile of Ni exhibited a peak at the interlayer and a valley adjacent it, whereas that of Cr exhibited a peak where Ni showed the valley. X- ray diffraction (XRD) analyses showed that the Fe ₂ Ti, NiTi, and CrMn Intermetallic compounds and the Cr element formed at the interface. The thickness profiles of the blown specimens were measured and compared with theoretical calculations.     

100Cr6

100Cr6是轴承钢。综合性能良好,淬火和回火后,硬度高且均匀,耐磨性能好,接触疲劳强度高。钢的热加工性好,球化退火后有良好的可切削性。宜制作壁厚≤12 mm、外径≤ф250 mm的各种轴承套圈、钢球直径≤ф50 mm、圆锥、球面滚子直径≤ф22 mm及所有尺寸的滚针;还可用于制造量具、模具、木工刀具。力学性能：抗拉强度σb≥1617 MPa;冲击功Akv≥28 J;硬度61～64 HRC。     

Microstructure and strengthening mechanisms of Mg-6Al-6Nd alloy

The microstructure and strengthening mechanisms of as-cast Mg-6Al-6Nd alloy were studied. The results show that the addition of 6 wt.% Nd into Mg-6Al alloy leads to the precipitation of Al11Nd3 and Al2Nd phases and decrease in the content of Al solid soluted in Mg-Al matrix. The volume fractions of Al11Nd3 and Al2Nd phases are 3.64% and 0.34%, respectively. Compared with Mg-6Al alloy, the ultimate strength, yielding strength, and elongation of Mg-6Al-6Nd alloy at room temperature and 175°C are enhanced in some degrees. The strengthening mechanisms of Mg-6Al-6Nd alloy are mainly composed of solid solution strengthening of Al solid soluted in Mg-Al matrix and grain refinement strengthening, dispersion strengthening, and composite strengthening brought by the precipitation of Al11Nd3 phase. The composite strengthening includes the load transfer from the matrix to Al11Nd3 phase and the enhancement of dislocation density due to the geometrical mismatch and thermal mismatch between the matrix and Al11Nd3 phase.     

Study on SCS-6/Ti-6AI-4V Composite

Fiber reinforced titanium matrix composite is considered as a superior material for advanced lightweight aerospace application. Fiber/matrix interfacial reaction has a significant effect on the mechanical properties of the composites. The SCS-6 SiC fiber reinforced Ti-6Al-4V matrix composite was prepared by foil-fiber-foil (FFF) method at ONERA, France. Stripe samples were cut from the as-consolidated composites and sealed in silicon carbide tube. One group of the samples were annealed for 58h at 550℃, 700℃, 850℃ and 1000℃, the other group were annealed at 1000℃for 43h, 58h, 80h, 100h, respectively. The interface investigation indicated that the connection between SiC fiber and the matrix is favorite in the composite. And the interface width for as-consolidated composite is only about 0.8μm. The interface width increase with the prolong of annealing time and the increase of annealing temperature. But the increment for the latter is not as high as the former one, which means the annealing time may be the prior factor to influence the interface reaction. The interface width for the composite annealed at 1000℃ for 100h is about 20μm. Interface composition of the composite detected by EDX is as follows: Ti 87.58 wt %, V 4.91 wt %, Al 4.06wt%, Si 3.45 wt %.     

Increasing the wear resistance of bearing alloy SOS 6-6

Conclusion The wear resistance and microhardness of the SOS 6-6 alloy increase over 30% when the melt is treated by ultrasonic vibration, which is of great practical value in increasing the working life of automobile engines.Leningrad Electrical Engineering Institute of Communications. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 48–49, July, 1968.