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141.
The shear strength behavior and microstructural effects after aging for 100 h and 1,000 h at 150°C are reported for near-eutectic
Sn-Ag-Cu (SAC) solder joints (joining to Cu) made from Sn-3.5Ag (wt.%) and a set of SAC alloys (including Co- and Fe-modified
SAC alloys). All joints in the as-soldered and 100-h aged condition experienced shear failure in a ductile manner by either
uniform shear of the solder matrix (in the strongest solders) or by a more localized shear of the solder matrix adjacent to
the Cu6Sn5 interfacial layer, consistent with other observations. After 1,000 h of aging, a level of embrittlement of the Cu3Sn/Cu interface can be detected in some solder joints made with all of the SAC alloys and with Sn-3.5Ag, which can lead to
partial debonding during shear testing. However, only ductile failure was observed in all solder joints made from the Co-
and Fe-modified SAC alloys after aging for 1,000 h. Thus, the strategy of modifying a strong (high Cu content) SAC solder
alloy with a substitutional alloy addition for Cu seems to be effective for producing a solder joint that retains both strength
and ductility for extended isothermal aging at high temperatures. 相似文献
142.
143.
Robert Dittmer Wook Jo Jürgen Rödel Sergei Kalinin Nina Balke 《Advanced functional materials》2012,22(20):4208-4215
Piezoresponse force microscopy (PFM) is used to afford insight into the nanoscale electromechanical behavior of lead‐free piezoceramics. Materials based on Bi1/2Na1/2TiO3 exhibit high strains mediated by a field‐induced phase transition. Using the band excitation technique the initial domain morphology, the poling behavior, the switching behavior, and the time‐dependent phase stability in the pseudo‐ternary system (1–x)(0.94Bi1/2Na1/2TiO3‐0.06BaTiO3)‐xK0.5Na0.5NbO3 (0 <= x <= 18 mol%) are revealed. In the base material (x = 0 mol%), macroscopic domains and ferroelectric switching can be induced from the initial relaxor state with sufficiently high electric field, yielding large macroscopic remanent strain and polarization. The addition of KNN increases the threshold field required to induce long range order and decreases the stability thereof. For x = 3 mol% the field‐induced domains relax completely, which is also reflected in zero macroscopic remanence. Eventually, no long range order can be induced for x >= 3 mol%. This PFM study provides a novel perspective on the interplay between macroscopic and nanoscopic material properties in bulk lead‐free piezoceramics. 相似文献
144.
145.
无铅焊接工艺中常见缺陷及防止措施 总被引:1,自引:1,他引:0
无铅化电子组装中,由于原材料的变化带来一系列工艺的变化,随之产生许多新的焊接缺陷.针对焊点剥离和元素污染缺陷进行了产生机理分析,并给出了相应的解决措施. 相似文献
146.
V.B. Tinti D. Marani A. Kabir A.B. Haugen V. Esposito D.Z. de Florio 《Ceramics International》2021,47(9):12130-12136
Bismuth titanate is a lead-free piezoelectric ceramic with outstanding properties that strictly depend on the composition and microstructure. However, bismuth-based materials are difficult to synthesize due to bismuth volatilisation that causes secondary phases and stoichiometry deviations. In this work, we propose a low-temperature chemical route, i.e. a modified amorphous citrate method, that allows a reduction of thermal treatment temperature, when compared with solid-state or other chemical routes, to obtain single-phase bismuth titanate samples. Single-phase powders with particle size under 300 nm are produced by calcination at 700 °C, and prepared into homogeneous dense pellets (density above 95%), with only isolated pores. The pellets show two distinctive features in the electrical behaviours directly associated with their mica-like microstructure: planar oriented boundaries are responsible for oxygen conduction, while the bulk is dominated by electronic conductivity. The samples show a high dielectric constant, around 200 at room temperature, while maintaining a low loss factor. The pellets also achieved a maximum polarisation of 5.85 μC/cm2 and an inverse piezoelectric coefficient of 7.4 pm/V. The dielectric and piezoelectric properties obtained are comparable or superior to the state-of-the-art. 相似文献
147.
Hao-Cheng Thong Ze Xu Chunlin Zhao Lu-Yao Lou Shi Chen Si-Qing Zuo Jing-Feng Li Ke Wang 《Journal of the American Ceramic Society》2019,102(2):836-844
Abnormal grain growth (AGG) is frequently observed in sintered (K, Na)NbO3 (KNN)-based piezoceramics. However, in the present study, abnormal grain growth was unexpectedly discovered in calcined KNN-based powders. To explain the phenomenon, three well-established models that account for the AGG in sintered ceramics were discussed, including (a) liquid-phase-assisted grain growth, (b) two-dimensional nucleation grain growth, and (c) complexion coexistence. However, the AGG in calcined powders was concluded to be none of them, but a consequence of the A-site compositional inhomogeneity in the K2CO3-Na2CO3-Nb2O5 ternary system. Since repeated calcination and ball milling have low efficiency on solving AGG and the accompanied compositional inhomogeneity, abnormal grains were found to coexist with normal grains at a very high calcination temperature, that is, 1000°C. The compositional inhomogeneity is believed to be remaining even after sintering and consequently deteriorate the comprehensive performances, which might be a determinant for the unstable reproduction of KNN-based piezoceramics. 相似文献
148.
Elaheh Taghaddos Harry Charalambous Thomas Tsakalakos Ahmed Safari 《Journal of the European Ceramic Society》2019,39(9):2882-2888
Lead-free, (BiNa0.88K0.08Li0.04)0.5Ti0.995 Mn0.015 O3 piezoceramic has been successfully densified by a novel electrical current applied technique known as flash sintering (FS) at 880 °C. The effect of alternating and direct current, current density limit and holding time on the densification, crystal structure, electromechanical and electrical properties have been investigated. The optimum flash condition was obtained with a 1 KHz alternating current, 100 V·cm?1 initial electric field and preset maximum current limit of 1.5 A·cm-2. The flash sintered specimen is characterized with finer grain size (10–15 μm), slightly higher electromechanical properties and higher symmetry butterfly shape strain hysteresis loop compared to conventional sintering. Under both sintering conditions uniform distribution of elements and pure rhombohedral structure were observed. Flash sintering also results in lower resistivity and more significant grain boundaries contributions in the conduction mechanism. 相似文献
149.
He Qi Ruzhong Zuo Aiwen Xie Jian Fu Dou Zhang 《Journal of the European Ceramic Society》2019,39(13):3703-3709
The energy-storage performance of stable NaNbO3-based antiferroelectric (AFE) ceramics was for the first time reported in (0.94-x)NaNbO3-0.06BaZrO3-xCaZrO3 lead-free ceramics. A gradual evolution from an instable AFE phase (x≤0.01) to an orthorhombic AFE P phase (Pbma) (0.01<x≤0.05) was found to accompany the appearance of repeatable double-like polarization versus electric field loops although poled samples (x<0.01) own an AFE monoclinic phase (P21). Interestingly, compared with x≤0.01 samples with instable antiferroelectricity, a relatively high recoverable energy storage density Wrec ? 1.59 J/cm3 (@ 0.1 Hz) and a storage efficiency η of ?30% were achieved in the x = 0.04 ceramic. Moreover, a high Wrec of > 1.16 J/cm3 and an outstanding charge-discharge performance with fast discharge rate (t0.9 < 100 ns) were generated in the temperature range from room temperature to 180 °C in the x = 0.04 ceramic. These results suggest that NaNbO3-based AFE P-phase ceramics could be new potential dielectric materials for high-energy storage capacitors. 相似文献
150.
The effects of sintering additives on photostriction properties have been rarely reported and the polarization effect of KNN-based ceramics on the photostriction characteristics remains uncertain. In the present work, a highly feasible approach has been adopted to obtain improved photostrictive coefficient (α = 2.4 × 10?9 m2/W) for KNN-based ceramics by adding appropriate amount (x = 0.5 wt%) of MnO2 as sintering additives into 0.97(K0.5Na0.5)NbO3-0.03(La0.51Na0.49)(Zr0.54Ni0.46)O3 (97KNN-3LNNZ) ceramics. The appropriate amount of MnO2 (x ≤ 0.5 wt%) in the ceramics does not alter the inherent multi-phase structure and results in uniform grain growth of the ceramics. The ferroelectricity and piezoelectricity can be optimized by the “softening” effect of Mn2+ and Mn3+ in KNN-based ceramics. The addition of MnO2 increases energy band gap and also optimizes the optical absorption properties in the near-infrared band. 97KNN-3LNNZ+0.5 wt% MnO2 ceramics show optimum overall performance. In addition to this, for x = 0.5 wt% sample, the power-dependent Raman spectra of ceramics measured before and after the electrical poling shows that the prior E-field poling can enhance the red shift corresponding to F2g bending vibration mode. Subsequently, there are changes in bond angle of elements induced by light in oxygen octahedron. These phenomena play active roles in getting a deep understanding of the underlying mechanisms of photostriction for ferroelectric ceramics. 相似文献