1. |
Fast Firing of a Lead‐Iron Niobate Dielectric Ceramic |
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Journal of the American Ceramic Society,
Volume 68,
Issue 6,
1985,
Page 140-140
Michael P. Kassarjian,
Bradley H. Fox,
James V. Biggers,
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摘要:
A Pb(Fe, Nb)O3−Pb(Fe, W)O3−Pb(Zn, Nb)O3dielectric ceramic fires at temperatures low enough for 100% silver electrodes to be used in multilayer capacitors made with the ceramic. Good dense Pb(Fe, Nb)O3, ceramics were obtained by fast, firing, i.e. by using rapid ramp rates and very short firing times. The densified ceramic was characterized by determination of its dielectric properties, X‐ray diffraction, and scanning electron micro
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1985.tb15219.x
出版商:Blackwell Publishing Ltd
年代:1985
数据来源: WILEY
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2. |
Effect of Impurities on Sic Whisker Morphology |
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Journal of the American Ceramic Society,
Volume 68,
Issue 6,
1985,
Page 142-144
K. S. Mazdiyasni,
Avigdor Zangvil,
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摘要:
Thermal decomposition of polymeric organosilicon, as precursor to Sic whiskers, in the presence of impurities such as alkali and alkaline‐earth metals and aluminum resulted in glass beads or droplets on the β‐Sic whiskers. Semiquantitative analysis of typical whiskers and whiskers with glass beads were performed using a transmission electron microscope equipped with an energy‐dispersive X‐ray spectrometer and a scanning transmission electron microscope equipped with an electron energy loss spectrometer. The major impurities identified were correlated with the processing method
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1985.tb15220.x
出版商:Blackwell Publishing Ltd
年代:1985
数据来源: WILEY
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3. |
Creep Deformation of an Alumina Matrix Composite Reinforced with Silicon Carbide Whiskers |
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Journal of the American Ceramic Society,
Volume 68,
Issue 6,
1985,
Page 144-145
Atul H. Chokshi,
John R. Porter,
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摘要:
Whisker‐reinforced ceramic composites with enhanced fracture toughness properties are being developed. The creep behavior of such a composite was studied. The introduction of silicon carbide whiskers significantly improves the creep resistance of polycrystaline alumin
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1985.tb15221.x
出版商:Blackwell Publishing Ltd
年代:1985
数据来源: WILEY
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4. |
Noncontact Ultrasonic Characterization of Ceramics |
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Journal of the American Ceramic Society,
Volume 68,
Issue 6,
1985,
Page 146-146
Cheng‐Kuei Jen,
Paolo Cielo,
Xavier Maldague,
Kamal El‐Assal,
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摘要:
A noncontact ultrasonic technique for the characterization of piezoelectric ceramics is described. The velocity of a laser‐generated surface‐acoustic‐wave pulse propagating at the surface of the ceramic material is measured by an optical probe. The laser beam has an annular section in order to produce a conveniently strong ultrasonic pulse without overheating the surface. Applications to the characterization of PZT samples are desc
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1985.tb15222.x
出版商:Blackwell Publishing Ltd
年代:1985
数据来源: WILEY
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5. |
Bridging and Nonbridging Oxygen Atoms in Alkali Aluminosilicate Glasses |
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Journal of the American Ceramic Society,
Volume 68,
Issue 6,
1985,
Page 148-150
Paulette I. K. Onorato,
Michael N. Alexander,
Charles W. Struck,
G. William Tasker,
D. R. Uhlmann,
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摘要:
Thallium‐probe ion luminescence spectroscopy and X‐ray photoelectron spectroscopy were used to study the structure of sodium aluminosilicate glasses. It was demonstrated that the O1s spectral envelope for these glasses is comprised of three energetically distinct peaks, two attributed to bridging oxygen atoms (Si‐O‐Si and Al‐O‐Si) and one to nonbridging oxygen atoms (Si‐O‐Na). Both techniques indicate that nonbridging oxygen atoms are present in all sodium aluminosilicate glasses, for wh
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1985.tb15223.x
出版商:Blackwell Publishing Ltd
年代:1985
数据来源: WILEY
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6. |
Feasibility Study of the Welding of Sic |
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Journal of the American Ceramic Society,
Volume 68,
Issue 6,
1985,
Page 151-151
Thomas J. Moore,
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摘要:
In a brief study of the feasibility of welding sintered a‐Sic, solid‐state welding and brazing were investigated. Joint quality was determined solely by microstructural examination. Hot‐pressure welding was shown to be feasible at 1950°C. Diffusion welding and brazing were also successful under hot isostatic pressure at 1950°C when boride, carbide, and silicide interlayers were used. Furnace brazing was accomplished at 1750°C when a TiSia interlayer was in
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1985.tb15224.x
出版商:Blackwell Publishing Ltd
年代:1985
数据来源: WILEY
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7. |
Effect of Additives on the Formation of Ti02Particles by Vapor Phase Reaction |
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Journal of the American Ceramic Society,
Volume 68,
Issue 6,
1985,
Page 154-154
Yoko Suyama,
Akio Kato,
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摘要:
The effect of additives on the formation of fine Ti02particles by vapor phase reaction was studied. The oxygenolysis of TiC14was enhanced by the addition of Fecl3, and AlBr3, and suppressed by SiCl4, and ZrCl4. Particles formed in the presence of additives were 1/2 to 1/5 the size of those formed without additives, and particle size distributions became very narrow. Particle shape was also influenced by the additives.
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1985.tb15225.x
出版商:Blackwell Publishing Ltd
年代:1985
数据来源: WILEY
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8. |
Phase Studies Concerning Sintering in Aluminas Doped with Ti4+ |
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Journal of the American Ceramic Society,
Volume 68,
Issue 6,
1985,
Page 156-156
Peter E. D. Morgan,
Michael S. Koutsoutis,
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摘要:
Previous solid state analyses of sintering in Ti4+‐doped‐commercial alumina are shown to be in error because a liquid phase exists in the appropriate region of the Al2O3−TiO3−Na2Ophase diagram at least by 1350°C, a temperature lower than that at which “solid state” studies were conducted. It is suggested that liquid‐phase sintering is a much more common occurrence than was rea
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1985.tb15226.x
出版商:Blackwell Publishing Ltd
年代:1985
数据来源: WILEY
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9. |
Sintering Behavior of Ceramic Films Constrained by a Rigid Substrate |
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Journal of the American Ceramic Society,
Volume 68,
Issue 6,
1985,
Page 287-292
R.K. BORDIA,
R. RAJ,
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摘要:
A model is presented in which the sintering behavior of a ceramic film which is constrained by a rigid substrate is contrasted with the sintering behavior of a free film. The problem is made simple by the assumption that the stress field developed in the film is uniform. This simplification allows several closed form solutions to be obtained. The solutions give new insights into the sintering behavior of films supported on a substrate. It is found (1) that the shear rate of the film is more important in the sintering process than its densification rate when the film is constrained by a substrate, (2) that the incompatibility stress is time dependent and reaches its maximum value during the initial stages of sintering, (3) that the magnitude of that maximum stress may be tensile or it may be compressive depending on the shear response of the material, and (4) that if the incompatibility stress is tensile it can lead to the formation of cracks or defects in the ceramic film.
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1985.tb15227.x
出版商:Blackwell Publishing Ltd
年代:1985
数据来源: WILEY
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10. |
Outstanding Problems in the Kaolinite‐Mullite Reaction Sequence Investigated by29Si and27Al Solid‐state Nuclear Magnetic Resonance: I, Metakaolinite |
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Journal of the American Ceramic Society,
Volume 68,
Issue 6,
1985,
Page 293-297
K. J. D. MacKENZIE,
I. W. M. BROWN,
R. H. MEINHOLD,
M. E. BOWDEN,
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摘要:
Structural models previously proposed for metakaolinite are examined in light of the most recent published experimental data and new information obtained by solid‐state high resolution29Si and27AI NMR. A new model for metakaolinite is proposed, consisting of anhydrous regions of distorted AI‐0 tetrahedra containing randomly distributed isolated residual hydroxyls associated with A1‐0 configurations of regular octahedral and tetrahedpal symmetry. Such a structure, which can readily be formed from kaolinite by the removal of hydroxyls in certain sequences, accounts for the lack of a well‐defined X‐ray pattern and the persistence of ∼10% residual hydroxyls in metakaolinite and is consistent with the most recent density data, bond lengths, and the new29Si and27
ISSN:0002-7820
DOI:10.1111/j.1151-2916.1985.tb15228.x
出版商:Blackwell Publishing Ltd
年代:1985
数据来源: WILEY
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