刘西文
,
杨中文
绝缘材料
doi:10.3969/j.issn.1009-9239.2007.05.002
用305酯增塑剂与其它添加剂配合使用,部分取代TOTM生产船用105℃聚氯乙烯(PVC)电线电缆料,并对其浸水前后的电性能等进行了测试分析,结果表明:用305酯作主增塑剂时,与4～5份的TCP并用可以显著改善电缆料浸水电性能.在配方中采用二苯铅和硬铅作稳定系统,少加或不加皂类稳定剂,更能保证电线电缆料浸水电性能的稳定.
关键词:
305酯
,
船用
,
105℃电线电缆料
,
电性能
杜旻
,
黄洪驰
,
刘锋
绝缘材料
采用耐热改性剂对环氧树脂进行改进，分别选用A、B、C3种不同类型的短切玻璃毡制备环氧玻璃毡层压板，并对其力学性能及电气性能进行测试和分析。结果表明：经改性环氧树脂制备的环氧玻璃毡板的耐热性能显著提高，其中使用A型短切玻璃毡制备的改性环氧玻璃毡层压板的综合性能较好，满足IEC标准中EP-GM305玻璃毡板技术指标的要求，达到H级耐热等级，并与国外同类产品的技术水平相当。
关键词:
环氧树脂
,
玻璃毡
,
改性
,
H级
,
层压板
李雪梅
,
孙凤莲
,
刘洋
,
张浩
,
辛瞳
稀有金属材料与工程
在一定温度及电流密度下对Cu/SAC305(Sn-3.0Ag-0.SCu)/Cu焊点进行不同加载时间的电迁移时效试验.分析了电-热耦合作用下,焊点界面IMC的生长机理及界面近区元素扩散特征.结果表明:电-热耦合作用下阳极界面IMC(金属间化合物)层厚度变化与加载时间成抛物线关系;阴极界面IMC层形貌变化显著,其厚度随加载时间的延长呈现先增厚后减薄的变化特征;焊点界面近区元素扩散分为两个阶段:初始阶段由于焊点各部分元素浓度相差悬殊,浓度梯度引起的元素扩散起主导作用,促进两极界面IMC厚度增加;扩散到一定程度后界面近区元素浓度梯度相对减小,电子风力引起的元素扩散占主导部分,促进阴极IMC分解阳极IMC形成,导致阴极IMC层厚度减薄,阳极IMC层厚度逐渐增大.
关键词:
SAC
,
电迁移
,
IMC
,
元素扩散
Materials and Manufacturing Processes
A powder processing technique is developed for the synthesis of zirconia-nickel cermets, which have similar microstructures as those prepared by plasma spraying using the same starting powders, in order to measure their thermophysical properties. The processing parameters are determined: pressing at 764 MPa and sintering at 1270 degrees C for 50 minutes. The results show that yield strength and relative scratch hardness increase with increasing ceramic content and decrease after attaining their maximum values with further increasing ceramic content.
关键词:
coatings;behavior
Journal of Materials Science-Materials in Electronics
The heterogeneous microstructure of solder could be obtained when cooling rate of the solder joint was not even, which would affect the corrosion behavior of solder during service. The ambient temperature would also affect the corrosion behavior of solder joint. In this paper, the effects of microstructure and temperature on the corrosion behavior of Sn-3.0Ag-0.5Cu (SAC305) lead-free solder were investigated. The various microstructures of SAC305 lead-free solder were obtained by cooling specimens in air and furnace. Compared to the fine-fibrous Ag(3)Sn phase inside the commercial SAC305 solder, platelet-like Ag(3)Sn formed as cooling speed decreasing. The polarization behavior of SAC305 solders in 3.5 wt.% NaCl solution was not significantly affected by various microstructures, but sensitive to temperature.
关键词:
ag-cu alloys;electrochemical corrosion;buffer solutions;nacl;solution;tin;snagcu;joints
王春艳
,
张宇鹏
,
许磊
材料热处理学报
对比研究了SAC305、SAC0307、SAC0307X共3种无铅钎料在不同环境温度和加载速率下的力学性能.结果表明,合金元素Ni、P等的添加能有效改善低Ag钎料的拉伸力学性能,但对钎料韧性提高有限;低Ag钎料SAC0307在55℃下的强度和韧性均低于SAC305钎料,而在85℃其韧性优于SAC305钎料.在55℃和85℃条件下,钎料合金拉伸力学性能均显著下降,在加载速率20 mm/min和55℃条件下,SAC305综合力学性能更有优势;而在85℃,低Ag无铅钎料SAC0307具备优势,因此低银无铅钎料应用需要进一步改善其在40 ～60℃范围的综合力学性能.
关键词:
低银钎料
,
加载速度
,
拉伸性能
,
无铅
,
伸长率
