低温碱浸高钛渣脱硅去除钛合金中的Ti_(5)Si_(3)相

利用低温碱溶液及熔体浸出对两种不同的高钛渣进行脱硅,研究温度、时间及氢氧化钠溶液浓度对脱硅率的影响。熔体除硅可导致高钛渣中的钛损失。用4 mol/L的氢氧化钠溶液浸出高钛渣,在温度为80℃、搅拌速率为600 r/min及保温时间为300 min的条件下,国内高钛渣中硅含量由0.96%(质量分数)降低至0.29%(质量分数),脱硅率为69.8%。在相同条件下,进口的高钛渣中硅含量由1.11%(质量分数)降低至0.12%(质量分数),脱硅率为89.2%。对采用镁还原高钛渣得到的合金粉末进行烧结,制备钛合金,并对合金进行表征。结果表明,钛合金中的Ti_(5)Si_(3)相已成功去除,此外,对两种高钛渣原料进行对比分析,并利用热力学软件对脱硅原理进行分析。

Preparation of low-oxygen-containing Ti-48Al-2Cr-2Nb alloy powder by direct reduction of oxides

A high-purity Ti-48Al-2Nb-2Cr alloy powder with an oxygen content as low as 0.0572 wt.%and a particle size of<150μm was produced from a mixture of TiO_(2),Al_(2)O_(3),Nb_(2)O_(5),and Cr_(2)O_(3)powders through reduction with magnesium and deoxidation with calcium.The phase and composition of the products were analyzed.The final product mainly includedγ-TiAl and minorα_(2)-Ti_(3)Al phases,and Ti,Al,Cr,and Nb were homogenously distributed in the powder with a mole ratio of 49.73:43.51:2.05:1.98.The reduction and deoxidation mechanisms were investigated by thermodynamic modeling using the HSC Chemistry software and Pandat software based on the Ti alloy database.

One-step production of high-strength titanium alloy by sintering titanium hydride powder from upgraded titania slag

A direct production method of high-strength titanium alloy from upgraded titania slag(UGS)was developed.First,UGS was reduced into alloy powder with 1.3 wt.%oxygen using magnesium powder.Subsequently,the alloy powder was compacted at 600 MPa to produce a pellet.Lastly,the pellet was sintered to produce titanium alloy.The reduced powder was characterized,and the effect arising from the sintering temperature on the sintered density,compressive strength,microstructure,and hardness of the alloys was studied.The results showed that the density tended to increase with the temperature increasing from 900 to 1200℃,whereas the porosity decreased.A significant sintering densification was achieved at the temperature above 1100℃(98.65%at 1100℃ and 99.41%at 1200℃).At 1100℃,the hardness and compressive strength reached the maximal values of the alloy,HV 655.7 and 1563 MPa,respectively.

Diagnostic value of orbicularis oculi muscle electromyography in functional epiphora

BACKGROUND Functional epiphora is a clinical condition which is not due to an anatomic defect.Most studies agree that it involves the action of the orbicularis oculi muscle,particularly its deeper segment(Horner’s muscle),but the exact mechanism is not clear.AIM To evaluate the orbicularis oculi muscle in functional epiphora patients using electromyography(EMG).METHODS A total of 8 Chinese patients(16 eyes)with functional epiphora were enrolled in this study,and ten volunteers(10 eyes)were included as normal controls.Five epiphora patients(five eyes)with facial palsy served as positive controls.Quantitative EMG was performed in the deeper segment of orbicularis oculi muscle.The average duration of each EMG waveform was measured.RESULTS The average duration of EMG waveforms in the normal control group,the functional epiphora group,and the facial palsy group were 6.39±0.73 ms,9.39±1.32 ms and 11.2±1.42 ms,respectively.The duration of EMG waveforms was significantly longer in the functional epiphora group than in the normal control group(P<0.05),and shorter than that in the facial palsy group(P<0.05).CONCLUSION These data indicate the presence of neurogenic orbicularis oculi muscle damage in epiphora patients,which may be the cause of functional epiphora.The etiology of neurogenic damage in the orbicularis oculi muscle requires further investigation.

Treatment of Kangxian Pills to Chronic Liver Injury in Mice Induced with Carbon Tetrachloride

Objective Kangxian Pills, containing Angelicae Sinensis, Chuanxiong Rhizoma, radix paeoniae rubra, and 12 other kinds of Chinese materia medica, have the functions of softening and dispersing blood stasis. It has been used for liver injury and liver fibrosis. The current study was designed to evaluate the anti-hepatic injury activity and the mechanism of Kangxian Pills on a CCl4-induced animal model. Methods To induce chronic liver injury, mice were treated with CCl4 twice a week for four weeks. Kangxian Pills（6 or 12 g/kg） and Compound Biejia Ruangan Tablet（0.901 g/kg） were ig given to mice once daily for four weeks after CCl4 was withdrawal. The anti-hepatic injury activities and mechanisms of Kangxian Pills were assessed by hepatic histology and by measuring the levels of aspartate aminotransferase（AST）, alanine aminotransferase（ALT）, albumin（ALB）, and total protein（TP） of serum as well as superoxide dismutase（SOD） and glycogen（Gn） of the liver. Results Kangxian Pills significantly decreased the levels of liver index, ALT, and AST in mice liver injury models in treatment group. Moreover, Kangxian Pills and Compound Biejia Ruangan Tablet inhibited the CCl4-induced reduction of SOD and Gn levels in the liver. The histological study showed that Kangxian Pills could reduce cellular swelling and infiltration of inflammatory cells in liver injury. Conclusion Kangxian Pills possess the potent abilities to alleviate chronic liver injury, suggesting that Kangxian Pills exert this effect by enhancing the anti-oxidant ability and metabolism of the liver.