Fuxing YIN
,
Y. Ohsawa and A.Sato (National Research Institute for Metals
,
Tsukuba
,
Ibaraki 305-0047
,
Japan)K.Aawahara(B.B.Materia Co. Ltd.
,
Chiba-Shi
,
Chiba 267-0066
,
Japan)
材料科学技术（英文）
A high damping condition is easily obtained in Mn-(16~24)Cu-(4~6)Ni-2Fe (at. pct) alloys,when cooling rate is controlled after the solid solution treatment at 1173 K. It is observed that the temperature dependent changes of Iogarithmic decrement in 10 h cooled samples are sensitive to the alloy composition. As compared with water quenching treatment, controlled 10 h cooling improves TN temperature of the alloys extensively by producing a Mn-enriched matrix portion in the alloys. Calcuiations suggest that the relative decreases of Cu and Ni content in the matrix portion be dominated by the Ni content in the original alloys, and therefore, the volume fraction of the Cu, Ni-enriched precipitates is estimated to be about 20% and 10% in the 4Ni and 6Ni alloys, respectively. As a result, the TN temperature fOr each alloy, corresponding to the rising temperature of logarithmic decrement, has been related to the Cu, and Ni content in the Mnenriched matrix. The existence of {110} twinning boundaries is confirmed in the microstructure of both 4Ni and 6Ni alloys. However, the relative lattice strains, which the twinning boundaries act to accommodate, are found largely different in the two alloys. It is considered that boundaries with smaller orientation deviation could coordinate the external Stresses easily by cyclic moving, and therefore, the broader damping peak which occurs in the 10 h cooled 6Ni alloy becomes feasible. Electron diffraction results also indicate possible for mation of many sub-crystals in the matrix phase, which are relatively rotated on some invariant planes. Those sub-crystal boundaries might play some attenuation roles in the temperature range between TN and room temperature.
关键词:
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
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
刘静
,
张富文
,
徐骏
,
杨福宝
,
朱学新
稀有金属
doi:10.3969/j.issn.0258-7076.2006.01.004
研究了少量合金元素Cr, Al对 Sn-3.0Ag-0.5Cu(305)无铅钎料高温抗氧化性的影响. 钎料在液态下的表面颜色变化以及热重分析表明, Cr, Al能明显改善305合金钎料的抗氧化性能. 通过合金元素Cr, Al的抗氧化机制和X 射线衍射分析得出: Al和Cr在钎料表面形成致密氧化膜, 形成"阻挡层", 抑制了钎料的氧化. 同时也比较了合金元素Cr, Al对 305钎料润湿性能的影响, 结果表明: 单独加Al不利于钎料的铺展, 少量的Cr和Al同时加入对钎料的铺展没有太大的影响. 实验证实: Cr和Al的共同作用明显提高了Sn-3.0Ag-0.5Cu 钎料的高温抗氧化性, 同时对钎料的润湿性也没有恶化作用.
关键词:
合金元素
,
Sn-3.0Ag-0.5Cu
,
无铅钎料
,
抗氧化性
,
润湿性
