摘要:

Thermal conductivities of silicate and borate glasses were determined at 30°C by steady‐state methods. From the experimental data, factors representing the contribution of individual oxides (on a weight‐percent basis) were calculated by the least‐squares method. The experimental thermal conductivities and those calculated from the factors obtained agree fairl

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10057.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Boron ions were implanted at room temperature in Ti films at a high dose (7.1 × 10I7and 2.3 × 1018ions/cm2), The formation of TiB2films was confirmed by X‐ray diffraction. Boron concentration profiles in implanted films were studied by secondary‐ion mass spectro

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10058.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

A dispensability model previously developed for silicon powder is extended to theoretically predict the behavior of silicon nitride and silicon carbide powders, and their nonstoichiometric analogs, in a variety of potential dispersing media.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10059.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Pore solutions expressed from hydrated Portland cement pastes containing up to 30% microsilica (silica fume) as replacement for cement were analyzed. The presence of microsilica enhances early concentrations of alkalies and hydroxyl ions, but after 1 day the effect is reversed, and the concentrations of these ions are progressively reduced to very low values. Alkali reduction seems more pronounced for pastes of higher water content, and low levels of microsilica replacement (5 or 10%) exert substantially greater than proportional effects.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10060.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Based on experimental results, the effects of fiber drawing tension on both optical and mechanical properties of optical fibers are discussed. Lower drawing tensions (i.e.>0.05 N (5 g)) were found to be desirable for fabricating uniform high‐strength fibers, whereas higher drawing tensions (i.e.>0.5 N (50 g)) were better for low‐loss fibers having a large silica c

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10061.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The proportion of monomeric silicate in a hydrated paste can be used to estimate the degree of hydration of alite or portland cement. The monomer was estimated by gel permeation chromatography of the trimethylsilylated pastes.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10062.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

A simple experimental method is proposed for determining stress intensity factors for composite plates in antiplane loading. The method relies on the fact that, in antiplane loading, a single harmonic potential function describes the state of stress und strain in an isotropic body in much the same way as a single potential function describes local flux densities in an electric conductor.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10063.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The surface condition of saturated clay‐based ceramic bodies is important in the transport of water. Only pure concentration diffusion can occur in bodies with saturated surfaces, whereas transport is enhanced by capillary forces in those with unsaturated surfaces. It is suggested that the transfer of water in a saturated ceramic body is controlled by both concentration and pressure diffusion. A pressure gradient results from capillary forces caused by menisci formed at an unsaturated surfac

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10064.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The kinetics of grain growth in fully dense Al2O3with and without MgO solute additions were measured. The MgO was found to retard boundary migration and to rkvelop more uniform microstructures. A grain‐growth mechanism involving solute partitioning of segregated ions (calcium and magnesium) between different boundary types is proposed. Implications regarding the sintering of Al2O3are discusse

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10065.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The effects of60Co gamma radiation on the strength‐related mechanical properties of a borosilicate glass were examined. Although the glass darkened considerably, only a very slight densification was observed after irradiation to levels of 108rads. The strength distributions were not appreciably changed by the irradiation, nor was the calculated slow crack growth parameter, orNvalue. Neither did radiation affect the elastic modulus or the fracture toughness of the glass. Gamma radiation does not affect the strength below 108rad

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1983.tb10038.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY