scholarly journals Role of Intermetallics in Lead-Free Alloys

2019 ◽  
Author(s):  
Dattaguru Ananthapadmanaban ◽  
Arun Vasantha Geethan
Keyword(s):  
Lead Free

scholarly journals Nano-domains in lead-free piezoceramics: a review

2020 ◽  
Vol 8 (20) ◽  
pp. 10026-10073 ◽  
Author(s):  
Xiang Lv ◽  
Xi-xiang Zhang ◽  
Jiagang Wu
Keyword(s):  
Systematic Review ◽  
Lead Free ◽  
Polar Nanoregions

A systematic review summarizing and analyzing the role of recently observed nano-domains and polar nanoregions (PNRs) in lead-free piezoceramics.

scholarly journals Piezoelectric characterization of lead-free ferroelectric ceramics

2010 ◽  
Vol 4 (3) ◽  
pp. 199-207 ◽  
Author(s):  
Lorena Pardo ◽  
Alvaro García ◽  
Klaus Brebøl ◽  
Lavinia Curecheriu ◽  
Liliana Mitoseriu ◽  
...  
Keyword(s):  
Sol Gel ◽  
Complex Impedance ◽  
Experimental Spectrum ◽  
Lead Free ◽  
Ferroelectric Ceramics ◽  
Coarse Grained ◽  
Shear Mode ◽  
Fine Grained ◽  
Accuracy Test

The challenge to develop high piezoelectric sensitivity and lead-free composition ferro-piezoelectric ceramics has recently dragged new attention to some classic ferroelectrics. Here, Ba(CexTi1-x)O3 (Ce-BT) and 0.94(Bi1/2Na1/2)TiO3-0.06BaTiO3 (BNBT6) ceramics were piezoelectrically characterized from measurements of complex impedance at electromechanical resonances and their analysis by Alemany et al. software. The reconstruction of the spectra for each resonance is used as an accuracy test of the set of calculated coefficients, quantitatively characterized by the regression factor (R2) of such reconstruction to the experimental spectrum. Piezoelectric activity at room temperature (RT) was observed for Ce-BT with x=0.06 and 0.1, ferroelectrics with T(?'max)>RT, but also for x=0.2 with T(?'max)<RT, which confirms its relaxor character (Ps?0 for T?T(?'max)). BNBT6 fine grained ceramics (~1 ?m) were prepared from nanopowder obtained by sol-gel autocombustion. Results obtained for the fine grained ceramic hot-pressed at 800?C for 2 h and recrystallized at 1050?C for 1 h are d33=148 pCN-1 and kp=26.8%. Despite of its lower grain size, the properties of this material are comparable with those reported for coarse grained ceramics obtained by sintering at T>1100?C. Some measurement issues, as the role of the mode coupling on the characterization results, illustrated for the shear mode of a thickness poled plate, are discussed.

Strong Piezoelectricity in (1 – x)(K0.4Na0.6)(Nb0.96Sb0.04)O3-xBi0.5K0.5Zr1–ySnyO3 Lead-Free Binary System: Identification and Role of Multiphase Coexistence

2015 ◽  
Vol 7 (10) ◽  
pp. 5927-5937 ◽  
Author(s):  
Ting Zheng ◽  
Jiagang Wu ◽  
Dingquan Xiao ◽  
Jianguo Zhu ◽  
Xiangjian Wang ◽  
...  
Keyword(s):  
System Identification ◽  
Binary System ◽  
Lead Free

The Role of Pb Impurity in SAC Solder Alloy

2013 ◽  
Vol 752 ◽  
pp. 42-47
Author(s):  
Gréta Gergely ◽  
Alíz Molnár ◽  
Zoltán Gácsi
Keyword(s):  
European Union ◽  
Intermetallic Compounds ◽  
Solder Alloy ◽  
Hazardous Substances ◽  
Lead Free ◽  
Lead Free Solder ◽  
The European Union ◽  
Free Solder ◽  
Sac Solder

The European Union and Japan initiated the issue of RoHS, the directive about the restriction of hazardous substances, which prohibits certain hazardous substances in electronic equipment - including lead - application. Due to the directive the use of lead free solder alloys is spreaded, however the Pb in the form of contamination may be appear under technological process. The lead impurity has significant effect on microstrucutre and lifetime so it is necessary to carry out detailed examinations. In this paper the study of intermetallic compounds in six-element, Pb impured, thermal cycles test-subjected, Sn-Ag-Cu (SAC) solder alloy is demonstrated

Advantages and Limitations of Lead-Free Bearing Materials

2006 ◽  
Author(s):  
Rick Walker ◽  
Rainer Aufischer ◽  
Robert Mergen ◽  
Dave Ciacci
Keyword(s):  
Aluminum Alloys ◽  
Lead Free ◽  
Automotive Engines ◽  
Automobile Engines ◽  
Bearing Materials ◽  
Development Plans ◽  
Lead Recycling ◽  
Carry Over ◽  
Copper Based Alloy

Due to strict lead recycling regulations put upon discarded automobile engines, removing lead from new automotive engines became essential. Removing lead found in batteries from discarded automobiles is fairly straight-forward and inexpensive; however, much labor and cost is associated with removing lead containing engine bearings. Due to the relatively light loading applied to automotive gas engine bearings, lead-free aluminum alloys have been developed. Many experts predict that this lead-free trend will carry over to non-automotive bearings as well. Many of these non-automotive engines are run on diesel fuel and have much higher loading on the bearings. The current generation of lead-free aluminum alloys just cannot carry the loads required by these engines. Therefore, there has been efforts on developing lead-free copper based bearing alloys. This paper reviews one process that was undertaken to develop lead-free copper based alloy to be used in these highly loaded, non-automotive lead-free engine bearing types. This process included a fundamental understanding of the tribological role of lead in copper based bearing alloys, as well as a thorough performance screening of lead-free bearings types based on this lead-free lining and a comprehensive review of the test results. Also included in this paper are some future development plans in the world of lead-free copper based bearings alloys.

scholarly journals The Role of Chloride Incorporation in Lead-Free 2D Perovskite (BA)2 SnI4 : Morphology, Photoluminescence, Phase Transition, and Charge Transport

2019 ◽  
Vol 6 (5) ◽  
pp. 1802019 ◽  
Author(s):  
Jun Wang ◽  
Hongzhi Shen ◽  
Wancai Li ◽  
Shuai Wang ◽  
Junze Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Charge Transport ◽  
Lead Free
Sign in / Sign up

Export Citation Format

Share Document