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Materials

Ceramics

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Displaying 1276 - 1300 of 1323

Ceramics 1998 Programs and Accomplishments

January 1, 1999
Author(s)
Stephen W. Freiman
The mission of the Ceramics Division can be stated as follows:Work with industry, standards bodies, academia, and other government agencies in providing the leadership for the Nation's measurements and standards infrastructure for ceramic materials.The

Characterization of Ternary Compounds in the BaO:Fe 2 O 3 :TiO 2 System: Ba 6 Fe 45 Ti 17 O 106 and BaFe 11 Ti 3 O 23

January 1, 1999
Author(s)
Terrell A. Vanderah, Winnie K. Wong-Ng, B H. Toby, V. M. Browning, Robert D. Shull, Richard G. Geyer, Robert S. Roth
Single crystals of Ba 6Fe 45Ti 17O 106 and BaFe 11Ti 3O 23 were obtained as major and minor co-products, respectively, by slow-cooling an off-stoichiometric BaO:Fe 2O 3:TiO 2 melt. The former compound exhibits variable stoichiometry Ba 6Fe 48-xTi 14+xO 106

Indentation Creep Behavior of a Direct-Filling Silver Alternative to Amalgam

December 1, 1998
Author(s)
Hockin D. Xu, Kate Liao, F Eichmiller
Amalgam creep has been identified as a key parameter associated with marginal breakdown and corrosion. Recently, a consolidated silver powder was proposed as a mercury-free alternative to amalgam. The aim of the present study was to characterize the time

Mechanical Properties of Si 02 and Si 3 N 4 Coatings: A BAM/NIST Cooperative Project

September 24, 1998
Author(s)
U Beck, Douglas T. Smith, G Reiners, S J. Dapkunas
Mechanical properties, i.e., hardness and elastic modulus, of amorphous Si 02 and Si 3N^4^ PE-CVD coatings have been studied for two coating thicknesses (0.1 υm and 1.0 υm) and two substrate materials (fused silica, i.e., Herasil, and borosilicate glass, i

Electroacoustic Analysis in Processing of Advanced Ceramics

September 1, 1998
Author(s)
Vincent A. Hackley, U Paik
Finely dispersed systems such as emulsions and colloidal suspensions are recognized as playing a critical role in many important industrial processes. Many of these systems are quite concentrated, and significant needs exist to develop measurement

Multiple Small-Angle Neutron Scattering

September 1, 1998
Author(s)
Gabrielle G. Long, Susan Krueger, Andrew J. Allen
Over the past decade, a multiple small-angle neutron scattering (MSANS) formalism has been developed to enable researchers to derive microstructural parameters from multiply-scattered small-angle neutron data. The MSANS formalism is particularly useful in

Diffraction Anomalous Fine Structure Study of Strained GA 1-x In x As on GaAs(001)

August 20, 1998
Author(s)
Joseph C. Woicik, J O. Cross, Charles E. Bouldin, Bruce D. Ravel, J G. Pellegrino, B W. Steiner, S G. Bompadre, L B. Sorensen, K E. Miyano, J P. Kirkland
Diffraction anomalous fine-structure measurements performed at both the Ga and As K edges have determined the Ga-As bond length to be 2.442 ± 0.005 {Angstrom} in a buried, 213 {Angstrom} thick Ga^0.78^In 0.22As layer grown coherently on GaAs(001). This

Coolant Flow in Surface Grinding with Non-Porous Wheels

August 1, 1998
Author(s)
P Hryniewicz, A Z. Szeri, S Jahanmir
A parameter that is often used in the assessment of cooling efficiency in grinding is the amount of fluid that flows through the grinding zone. This paper shows that when grinding with wheels possessing no bulk porosity, only a portion of the flow through

Hardness Testing of Ceramics

August 1, 1998
Author(s)
George D. Quinn
An overview of hardness testing of ceramics is presented. Conventional test methods are discussed, particularly with respect to major sources of experimental error and standardization. Two NIST Standard Reference Materials (SRMs) are highlighted. Emerging

Effect of P o2 and Ag on the Phase Formation of the Pb-2223 Superconductor

June 25, 1998
Author(s)
Winnie K. Wong-Ng, Lawrence P. Cook, W Greenwood
The chemical reactions and the compositional characteristics of liquids which lead to the phase formation of the Pb-2223 ((Bi,Pb):Sr:Ca:Cu:O) superconductor have been studied for a precursor composition of Bi 1.8Pb o.4Sr 2Ca 2.2Cu 3O x. The combined

Indentation of Ceramics with Spheres: A Century After Hertz

May 4, 1998
Author(s)
Brian R. Lawn
In this article we review the nature and mechanics of damage induced in ceramics by spherical indenters, from the classical studies of Hertz over a century ago to the present day. Basic descriptions of continuum elastic and elastic-plastic contact stress

Characterization of Fracture Origins in Advanced Ceramic Materials

May 1, 1998
Author(s)
George D. Quinn, J Swab, E F. Begley
This NIST web site will complement ASTM standard C1322-96, Standard Practice for Fractography and Characterization of Fracture Origins in Advanced Ceramics. The objectives of the web site are to prove a thumbnail sketch of the standard, promote its usage

Ultrasonic Characterization in Advanced Processing of Ceramic Powders

May 1, 1998
Author(s)
Vincent A. Hackley
A world wide web (www) site focussing on NIST efforts in ultrasonic applications development for ceramic processing in fluid-based systems. This site contains information related to facilities, instrumentation, research, and ultrasonic techniques in

Anisotropic Microstructure of Plasma-Sprayed Deposits

April 1, 1998
Author(s)
J Ilavsky, Gabrielle G. Long, Andrew J. Allen, L Leblanc, M Prystay, C Moreau, Alan H. Band
The microstructure of plasma-sprayed deposits [PSD] is dominated by two void systems-interlamellar pores and intralamellar cracks - each with a different anisotropy. Varying anisotropies and crack-to-pore ratios within PSDs are responsible for the

Fracture Toughness Data for Brittle Materials

April 1, 1998
Author(s)
R G. Munro, Stephen W. Freiman, T L. Baker
Fracture toughness data, as represented by the critical stress intensity factor, K Ic, and the fracture energy, γ, have been compiled from publicly accessible sources for a wide range of brittle materials with an emphasis on structural ceramics and closely
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