Leadings matrix

Extmded or roUed lead—copper alloys contain a uniform dispersion of copper particles in a lead matrix. Because the soHd solubiUty of copper in lead is very low, copper particles in the matrix remain stable up to near the melting point of lead, maintaining uniform grain size even at elevated temperature. 

Leaching of Lead Matrix Materials. The use of a metal matrix for waste encapsulation is being studied. The neutron activation method was used to evaluate the leaching characteristics of potential metal matrix materials. Lead was selected for initial studies. Reagent grade lead beads (2.2-mm diameter, weighing 75 mg... 

It helps at this point to make some simplifying substitutions. The elements in the inverse matrix, o 1, are all equal to elements of the original matrix divided by the determinant. But, the determinant appears in the leading matrix, which is inverted and in the trailing vector (which is not). Therefore, the determinant will... 

EDS results from a number of tablets demonstrated that the Cu inclusions are generally alloys with chemical compositions of bronze and brass. These inclusions also contained variable amounts of lead and arsenic. The inclusions were small enough to make it difficult to determine if the lead was from the lead matrix, or from the inclusion. Tablet AUD-259 was found to have a Sn-Sb alloy. Figure 5 shows the spectra of the largest of these Sn-Sb alloy inclusions. The two elements overlap somewhat on the EDS spectra but a double peak from the strongest lines of each element can be seen. WDS analysis revealed that the alloy is approximately 54% Sn, 43% Sb, 1.5% As, and 1.5% Pb. Silver inclusions are generally pure silver, according to the EDS spectra. 

The basis for the performance of the alloy in VRLA batteries is corrosion of the lead-cadmium-antimony alloy to produce antimony in the corrosion layer of the positive grid, which thus eliminates the antimony-free eifect of pure lead or lead-calcium alloys. During corrosion, small amounts of antimony and cadmium present in the lead matrix are introduced into the corrosion product and thereby dope it with antimony and cadmium oxides. The antimony and cadmium give excellent conductivity through the corrosion product. The major component of the alloy, the CdSb intermetallic alloy, is not significantly oxidized upon float service, but may become oxidized in cycling service. 

Modification of PAMELA II (FRG—DWK/Eurochemic/ KFK, Mol) Borosilicate glass Beads in lead matrix Joule-heated ceramic Liquid Chemical or thermal... 

Metallic lead has a low melting point (T = 327 °C). This allows diffusion of the alloying elements into the lead matrix at room temperature. These diffusion processes will result in the formation of inter-metallic compounds, which will alter the properties of the lead alloy with time. The changes in mechanical properties of lead alloys during ageing have been extensively studied. Some of the obtained results will be summarised below. 

Ho CT, Coated carbon-fibers and their composites with tin-lead matrix, J Mater Sci Lett, 14(2), 135-138, 1995. 

The leading matrix in this equation has the same structure as matrices occuring in constrained least squares problems and solution techniques discussed in Sec. 2.3 can be applied. This leads to an additional gain by a factor two in the number of operations for decomposing the Jacobian. 

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