The vacuum electronic device is the key components widely used in the fields of radar,navigation,electronic warfare and so on.Multi-brazing process is adopted in the manufacturing,and the leakage is easy to happen at ...The vacuum electronic device is the key components widely used in the fields of radar,navigation,electronic warfare and so on.Multi-brazing process is adopted in the manufacturing,and the leakage is easy to happen at many parts,such as brazed seams and base materials of tube shell,leading breakage of the devices.But now the brazing filler metal used in the stockage of vacuum electronic devices is very seldom.For the safe of vacuum electronic devices,stockage temperature must be lower than the brazing temperature.Gallium is liquid at room temperature,and has a lower vapor pressure.The Ga-based alloy can diffuse with the high melting point metal,and then form heat-resistance and a good sealing performance of solid-state alloys.In this study three kinds of Ga-based alloys used for the stockage were developed.The diffusion brazing for the stockage on three materials with defect,such as OFHC,kovar and Ag-Cu brazed seams was carried out.The influence factors such as parent materials,brazing filler metal and brazing temperature on the stockage quality were discussed.The results indicated that parent materials,brazing filler metals and brazing temperature had obvious influences on stockage.For OFHC and Ag-Cu filler with defects,the stockage effects were better than kovar.The effect of Ga-In-Cu alloy was the best because the compact diffusion layer was formed between the stockage brazing materials and base materials.As the brazing temperature went up,the diffusion layer formed between stockage material and OFHC,kovar became obviously thicker,the stockage effect got better.For Ag-Cu brazing seams,the stockage effect was satisfactory at 500℃,erosion will happen at the higher temperature.展开更多
目的探讨高压氧(HBO)联合负压封闭引流(VSD)技术治疗早期骨筋膜室综合征(OCS)患者46例的临床效果,并分析肿瘤坏死因子-α(TNF-α)、白细胞介素-6(IL-6)对病情变化的预测价值。方法回顾性分析2015年9月至2020年3月烟台市烟台山医院骨科...目的探讨高压氧(HBO)联合负压封闭引流(VSD)技术治疗早期骨筋膜室综合征(OCS)患者46例的临床效果,并分析肿瘤坏死因子-α(TNF-α)、白细胞介素-6(IL-6)对病情变化的预测价值。方法回顾性分析2015年9月至2020年3月烟台市烟台山医院骨科收治的89例早期OCS患者的临床资料,根据治疗方法分为观察组(n=46)和对照组(n=43)。对照组在常规对症治疗的基础上予以VSD治疗;观察组则在对照组治疗的基础上联合HBO治疗。治疗3个疗程后,比较2组患者的临床疗效;采用疼痛视觉模拟评分(VAS)评价患者治疗前后疼痛情况;记录2组患者肿胀消退时间和住院时间;观察患肢切口部位肉芽组织新鲜度及感染情况,综合判断是Ⅰ期缝合还是Ⅱ期伤口植皮;酶联免疫吸附法检测不同时间点血清IL-6、TNF-α表达水平,并预测OCS病情变化。结果治疗3个疗程后,观察组患者的治疗有效率(97.8%)明显高于对照组(81.4%),差异有统计学意义(P<0.05)。观察组患者Ⅱ期伤口植皮率(53.5%)明显低于对照组(21.7%),肉芽组织无感染率(80.4%)明显高于对照组(51.2%),差异均有统计学意义(P<0.05)。观察组患者肿胀消退时间[(13.14±3.42)d]和住院时间[(16.55±3.52)d]均明显短于对照组消退时间[(22.39±4.48)d]和住院时间[(26.87±5.51)d],差异均有统计学意义(P<0.05)。观察组患者术后7、14、21 d VAS明显低于对照组,差异有统计学意义(P<0.05)。观察组患者术后7、14 d血清TNF-α和IL-6水平明显低于对照组,差异均有统计学意义(P<0.05);但2组患者术后21 d血清TNF-α和IL-6水平比较差异无统计学意义(P>0.05)。结论HBO联合VSD治疗早期OCS可以改善患肢血液循环,降低切口感染,促进切口愈合,减轻肢体疼痛,提高治疗效果。展开更多
基金National Nature Science Foundation of China(51033026)
文摘The vacuum electronic device is the key components widely used in the fields of radar,navigation,electronic warfare and so on.Multi-brazing process is adopted in the manufacturing,and the leakage is easy to happen at many parts,such as brazed seams and base materials of tube shell,leading breakage of the devices.But now the brazing filler metal used in the stockage of vacuum electronic devices is very seldom.For the safe of vacuum electronic devices,stockage temperature must be lower than the brazing temperature.Gallium is liquid at room temperature,and has a lower vapor pressure.The Ga-based alloy can diffuse with the high melting point metal,and then form heat-resistance and a good sealing performance of solid-state alloys.In this study three kinds of Ga-based alloys used for the stockage were developed.The diffusion brazing for the stockage on three materials with defect,such as OFHC,kovar and Ag-Cu brazed seams was carried out.The influence factors such as parent materials,brazing filler metal and brazing temperature on the stockage quality were discussed.The results indicated that parent materials,brazing filler metals and brazing temperature had obvious influences on stockage.For OFHC and Ag-Cu filler with defects,the stockage effects were better than kovar.The effect of Ga-In-Cu alloy was the best because the compact diffusion layer was formed between the stockage brazing materials and base materials.As the brazing temperature went up,the diffusion layer formed between stockage material and OFHC,kovar became obviously thicker,the stockage effect got better.For Ag-Cu brazing seams,the stockage effect was satisfactory at 500℃,erosion will happen at the higher temperature.
文摘目的探讨高压氧(HBO)联合负压封闭引流(VSD)技术治疗早期骨筋膜室综合征(OCS)患者46例的临床效果,并分析肿瘤坏死因子-α(TNF-α)、白细胞介素-6(IL-6)对病情变化的预测价值。方法回顾性分析2015年9月至2020年3月烟台市烟台山医院骨科收治的89例早期OCS患者的临床资料,根据治疗方法分为观察组(n=46)和对照组(n=43)。对照组在常规对症治疗的基础上予以VSD治疗;观察组则在对照组治疗的基础上联合HBO治疗。治疗3个疗程后,比较2组患者的临床疗效;采用疼痛视觉模拟评分(VAS)评价患者治疗前后疼痛情况;记录2组患者肿胀消退时间和住院时间;观察患肢切口部位肉芽组织新鲜度及感染情况,综合判断是Ⅰ期缝合还是Ⅱ期伤口植皮;酶联免疫吸附法检测不同时间点血清IL-6、TNF-α表达水平,并预测OCS病情变化。结果治疗3个疗程后,观察组患者的治疗有效率(97.8%)明显高于对照组(81.4%),差异有统计学意义(P<0.05)。观察组患者Ⅱ期伤口植皮率(53.5%)明显低于对照组(21.7%),肉芽组织无感染率(80.4%)明显高于对照组(51.2%),差异均有统计学意义(P<0.05)。观察组患者肿胀消退时间[(13.14±3.42)d]和住院时间[(16.55±3.52)d]均明显短于对照组消退时间[(22.39±4.48)d]和住院时间[(26.87±5.51)d],差异均有统计学意义(P<0.05)。观察组患者术后7、14、21 d VAS明显低于对照组,差异有统计学意义(P<0.05)。观察组患者术后7、14 d血清TNF-α和IL-6水平明显低于对照组,差异均有统计学意义(P<0.05);但2组患者术后21 d血清TNF-α和IL-6水平比较差异无统计学意义(P>0.05)。结论HBO联合VSD治疗早期OCS可以改善患肢血液循环,降低切口感染,促进切口愈合,减轻肢体疼痛,提高治疗效果。
