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低熔点无铅焊料的研制 被引量:1
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作者 李元山 雷晓娟 陈振华 《计算机工程与科学》 CSCD 2007年第12期140-142,共3页
现有的Sn-Ag-Cu无铅焊料其关键问题是熔点比传统的Sn-37Pb高34℃~38℃,使得焊接设备和工艺都必须更换。我们在Sn-20Bi焊料的基础上通过添加微量元素并采用快速凝固的方法研制出一种新型的低熔点焊料。该焊料价格远低于Sn-Ag-Cu,其机... 现有的Sn-Ag-Cu无铅焊料其关键问题是熔点比传统的Sn-37Pb高34℃~38℃,使得焊接设备和工艺都必须更换。我们在Sn-20Bi焊料的基础上通过添加微量元素并采用快速凝固的方法研制出一种新型的低熔点焊料。该焊料价格远低于Sn-Ag-Cu,其机械性能、热性能、可焊性以及熔点都接近或优于Sn-37Pb。 展开更多
关键词 无铅焊料 低熔点 Sn-Bi-X 偏析 快速凝目
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Multi-objective model of fast-solidification sludge
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作者 周健 刘杰 +2 位作者 李晓品 张永胜 刘轶 《Journal of Central South University》 SCIE EI CAS 2012年第5期1383-1387,共5页
Many sludge curing technologies often have problems like long curing time,high cost,and low efficiency in the condition of low temperature,The compressive strength,moisture content and temperature are defined as the c... Many sludge curing technologies often have problems like long curing time,high cost,and low efficiency in the condition of low temperature,The compressive strength,moisture content and temperature are defined as the constraint conditions,and solidified cost,pH,COD,NH4+-N concentration are defined as the objective functions.The response surface analysis is used to obtain a variety of response expressions of factors,and the multi-objective optimization model of fast-solidification sludge is established.Then,the curing agent formulas are optimized.After three-day conserving,the curing sludge could meet the landfill conditions. 展开更多
关键词 solidified sludge multi-objective model sewage sludge response surface methodology
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