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Na_2O的含量对MoSi_2/Oxide系发热元件材料力学性能的影响 被引量:2
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作者 王刚 江莞 赵世柯 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2003年第1期103-108,共6页
对比了脱Na处理工艺前后Na2O含量变化对MoSi2/Oxide系发热元件材料力学性能的影响.研究结果表明,虽然Na2O含量的高低对发热体材料常温力学性能影响不大,但是对发热元件材料高温力学性能有重要影响.主要表现在:经1573K热处理100h后脱Na... 对比了脱Na处理工艺前后Na2O含量变化对MoSi2/Oxide系发热元件材料力学性能的影响.研究结果表明,虽然Na2O含量的高低对发热体材料常温力学性能影响不大,但是对发热元件材料高温力学性能有重要影响.主要表现在:经1573K热处理100h后脱Na材料仍拥有很高的强度和韦伯分布;而且经过真空脱Na后材料的高温蠕变特性也有了明显改善,在1243和1303K的条件下脱Na材料的蠕变速率分别是未脱Na材料的2/5和1/3以下.另外,Na2O含量对材料延性脆性转变温度(BDTT)也有重要影响,脱Na材料的BDTT较未脱Na材料升高约100K. 展开更多
关键词 MoSi2/Oxide系发热元件 材料 二硅化钼 NA2O 韦伯分布 蠕变特性 bdtt 氧化钠 真空热处理
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NiAl-Cr(Zr)合金的高温力学行为与韧脆转变 被引量:8
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作者 齐义辉 郭建亭 崔传勇 《材料研究学报》 EI CAS CSCD 北大核心 2001年第2期209-214,共6页
研究了多相金属间化合物NiAl-33.5Cr-0.5Zr合金的显微组织、高温力学行为与初脆转变。铸造合金由β-NiAl和α-Cr组成的共晶胞及沿共晶胞界分布的Ni2AlZr(Heusler)相组成.用热等静医处理后.... 研究了多相金属间化合物NiAl-33.5Cr-0.5Zr合金的显微组织、高温力学行为与初脆转变。铸造合金由β-NiAl和α-Cr组成的共晶胞及沿共晶胞界分布的Ni2AlZr(Heusler)相组成.用热等静医处理后.在胞界处的Ni2AlZr相转变为富Zr相.该合金具有较高的高温压缩强度,高温压缩变形很好地符合幂指数规律.对高温拉伸延伸率的研究表明,该合金具有较明显的韧脆转变温度(BDTT),当应变速率为1.04x10-4s-1时,韧脆转变温度是1173K,应变速率提高两个数量级时,韧脆转变温度升高约100K.讨论了高温变形和韧脆转变机理. 展开更多
关键词 韧脆转变温度 显微组织 高温力学行为 镍铝合金 多相合金
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三聚氰胺反应器内件断裂分析
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作者 王士能 《理化检验(物理分册)》 CAS 2000年第3期127-130,共4页
通过系统调查和综合试验与分析 ,找出了三聚氰胺反应器内件断裂的主要原因是设备内件长时间在高温下运行 ,环境介质对内件表面发生渗氮、渗碳现象 ,另有少量氮缓慢渗入内件深部与基体铁素体生成氮化四铁脆性组织。而设备正常运行时偶尔... 通过系统调查和综合试验与分析 ,找出了三聚氰胺反应器内件断裂的主要原因是设备内件长时间在高温下运行 ,环境介质对内件表面发生渗氮、渗碳现象 ,另有少量氮缓慢渗入内件深部与基体铁素体生成氮化四铁脆性组织。而设备正常运行时偶尔异常高温造成钢材性能轻微老化 ,促进了钢材脆性转变温度升高。由于设备设计不合理 ,需要憋压开车。意外的冲击载荷造成这次设备内件脆性断裂事故。 展开更多
关键词 内件 脆性组织 三聚氰胺反应器 断裂
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The benefit of curative liver resection with a selective bile duct preserving approach for hepatocellular carcinoma with macroscopic bile duct tumor thrombus 被引量:4
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作者 Anon Chotirosniramit Akkaphod Liwattanakun +3 位作者 Sunhawit Junrungsee Wasana Ko-iam Trichak Sandhu Worakitti Lapisatepun 《Hepatobiliary Surgery and Nutrition》 SCIE 2020年第6期729-738,共10页
Background:Hepatocellular carcinoma(HCC)presenting with macroscopic bile duct tumor thrombus(BDTT)is an uncommon event.The role of a curative hepatic resection and associated long-term outcomes remain controversial.In... Background:Hepatocellular carcinoma(HCC)presenting with macroscopic bile duct tumor thrombus(BDTT)is an uncommon event.The role of a curative hepatic resection and associated long-term outcomes remain controversial.In addition the necessity for bile duct resection is still unclear.The aim of this study was to evaluate outcomes of hepatectomy with a selective bile duct preservation approach for HCC with BDTT in comparison to outcomes without BDTT.Methods:A total of 22 HCC with BDTT patients who had undergone curative hepatic resection with a selective bile duct preservation approach at our institute were retrospectively reviewed.These were compared to group of 145 HCC without BDTT patients.The impact of curative surgical resection and BDTT on clinical outcomes and survival after surgical resection were analyzed.Results:All HCC with BDTT cases underwent major hepatectomy vs.32.4%in the comparative group.Bile duct preservation rate was 56.5%.The 1-,3-and 5-year survival rates of HCC with BDTT patients in comparison to the HCC without BDTT group were 81.8%,52.8%and 52.8%vs.73.6%,55.6%and 40.7%(P=0.804)respectively.Positive resection margin,tumor size≥5 cm and AFP≥200 IU/mL were significant risk factors regarding overall survival.However,it is unclear whether presence of a bile duct tumor thrombus has an adverse impact on either recurrence free survival or overall survival.Conclusions:Bile duct obstruction from tumor thrombus did not necessarily indicate an advanced form of disease.Tumor size and AFP had greater impact on long-term outcomes than bile duct tumor thrombus.Major liver resection with a selective bile duct preserving approach in HCC with BDTT can achieve favorable outcomes comparable to those of HCC without BDTT in selected patients. 展开更多
关键词 Hepatocellular carcinoma(HCC) bile duct tumor thrombus(bdtt) bile duct preserve OUTCOMES
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