摘要:

A method is described for investigating the fracture properties of vitreous clay‐based ceramics. It involves indenting the specimen with a Vickers diamond in‐denter under paraffin oil and revealing the radial cracks so formed with the aid of insoluble dye particles. Typical results are quoted for soda‐lime glass and two electrical porcelains. It is suggested that differences in behavior of the porcelains can be attributed to the toughening effect of microc

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb09610.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Optical fibers are used to determine the etching rate and activation energy of silica and high‐silica glasses in hydrofluoric acid. The reaction is linearly dependent on time and transport controlle

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb09611.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

The temperature dependence of Young's modulus and internal friction (Q−1)in alumina, silicon nitride, and partially stabilized zirconia (Y‐PSZ) ceramics was studied. Little change in Q−1was found for alumina, whereas Q−1for silicon nitride ceramics increased above 700°C. The Q−1of Y‐PSZ increased markedly with increasing temperature up to a pe

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb09612.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

A densifcation algorithm for irradiated UO2fuel, modified to reflect a rapid densification rate from 0 to 10 MW.h/kg U, is presented. Included in a fuel performance code, the algorithm gives improved agreement between measured and calculated sheath strains.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb09613.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Borosilicate glass and glass‐ceramic forms were prepared from simulated Savannah River Plant high‐level nuclear waste by hot isostatic pressing. This process allows glass forms to be consolidated at temperatures as low as 850°C, removes viscosity constraints on frit selection, eliminates Cs volatilization, and permits waste loadings of 50 wt%. Actinide leach resistance of the glass form was improved by using redox control to induce formation of a minor uraninite crystalline p

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb09614.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Recent attempts to vitrify KHSO4have been fruitless, bringing into question the glass‐forming ability of this, the only hitherto known glass‐forming sulfate. Since KHSO4is easily converted to the pyrosulfate at temperatures above its melting point, it is likely that previously reported KHSO4glass samples were actually mixtures of the bisulfate and the pyrosulfate, with the pyrosulfate aiding vitrificat

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb09615.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

A microstructural study of a lead‐lanthanum zirconate‐titanate was conducted to examine the effects of the lead oxide used as a sintering aid. Although amorphous grain‐boundary phases are present in lead zirconate‐titanates sintered by a similar procedure, no such phase was found by careful microscopic exam

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb09616.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Mechanical and dielectric strengths were measured for BaTiO3, ceramics at room temperature. The results were evaluated in terms of Weibull statistics, and a clear analogy between the mechanical and dielectric strength distributions was found.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb09617.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

A quantitative visible‐uv spectroscopic study of local structure‐sensitive electronic transitions resulting from Ni2+doped into sodium borate in the glassy and liquid states up to 1000°C was conducted using a simple windowless Pt‐cell technique with a high‐temperature spectrophotometer. Analysis of the spectra shows that Ni2+is distributed between distorted tetrahedral and octahedral sites in a temperature‐dependent equilibrium with ΔH =44.4 kJ. mol−1in the liquid and a much smaller but nonvanishing value

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb09618.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Wasteform phase assemblages and radionuclide immobilization are described for a Synroc‐D bulk composition processed at 1200°C under oxygen fugacities (fO2) ranging from air to those approximating graphite‐CO‐CO2buffer. All processing conditions produce assemblages of titanate and aluminate crystalline phases plus alkali aluminosilicate glass. In all cases the important radionuclides are immobilized in crystalline phases which have been shown to be highly leach‐r

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb09619.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY