摘要:

The internal stress resulting from the thermal expansion mismatch between alumina and steel with and without an interlayer was evaluated. On the basis of the calculation, alumina and steel were bonded using the interlayer method and hot isostatic pressing at 1273 to 1573 K under 100 MPa for 30 min. When a laminated interlayer (niobiumlmolybdenum) was used, a joint with high bonding strength was obtained.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb19688.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Dehydration of gels prepared by the sol‐gel process from metal alkoxides in the systems B2O3‐SiO2and ZrO2‐SiO2was determined by measuring the shrinkage of the gel on heating. Dehydration was enhanced with increased ZrO2content, whereas it decreased with B2O3content. Diffusion of water was also measured in the nonporous glasses obtained by heating the gels. The diffusion rate was independent of the composition of the

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb19689.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

A simple method for measuring frictional stresses between the mairix and individual fibers in a ceramic composite is described. A standard microhardness indenter is used to apply a force to the end of the fiber and depress it below the matrix surface. The frictional stress is calculated from measurement of the applied force and the amount of slipping between the fiber and matrix.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb19690.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

In preparing specimens for studying reaction kinetics, it is essential to ensure proper contact between couple end‐members. In the present work, reaction couples were prepared by spraying layers of the end‐member materials over one another. This method has many advantages, including precise control over the properties of the end‐me

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb19691.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

The coalescence of two equal viscous cylinders under the influence of capillarity is of interest in the theory of sintering. Although the flow in typical cylinder coalescence experiments is not planar, the plane‐flow case is of general interest and is a good approximation in the early stage. An essentially exact analytic solution giving the shape as a function of time for slow plane flow is presented in simple closed for

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb19692.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Clear glasses were produced when SiO2in sodium borosilicate glasses was replaced by Ga2O3. Phase separation and/or crystallization occurred after heat treatment. The porous skeleton of leached material consisted of monoclinic β‐Ga2O3. The specific surface areas and pore radii are comparable to those of porous SiO2. Alumina contamination influenced the structure of the porous produ

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb19693.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

The development of hot‐pressed Sic‐whisker‐reinforced alumina has resulted in composites with fracture toughness values ∼;8.7 MPa·m112at 20 vol% SiC. Whisker orientation during processing leads to anisotropy in both fracture toughness and fracture strength. Fracture strengths are also limited by the ability to disperse the Sic whiskers; however, use of both fine alumina powders and ultrasonic dispersion techniques yields strengths

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb19694.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb19695.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb19697.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Diffusion of deuterons from D2O vapor into cordierite was performed at elevated temperatures. The presence of deuterons is monitored with infrared absorption of OD−ions at 2630 cm−1. The diffusion coefficientDat 1273 K is about 2 × 10−11m2/s. The activation energyEin the Arrhenius equation is 3 × 105J/mol. Out‐diffusion of D+ions can be enhanced by application of an elect

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1984.tb19698.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY