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Displaying 1701 - 1725 of 1733

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

Preparation and Characterization of Polymer/Dendrimer Blends Progress Report 2/24/97

June 1, 1998
Author(s)
Eric J. Amis, Barry J. Bauer, F I. Groehn, T J. Prosa, Da-Wei Liu, K A. Barnes, C L. Jackson, B D. Viers, Alamgir Karim, Jack F. Douglas
Dendrimer, dendrigraft, and hyperbranched solutions, blends, and interpenetrating polymer networks are characterized by small neutron and x-ray scattering, reflectivity, atomic force microscopy, and transmission electron microscopy.

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

Physical Aging Behavior in Amorphous Pen Film as Measured by Creep

May 1, 1998
Author(s)
M L. Cerrada, G B. McKenna, J M. O'Reilly, J E. Greene, J R. Gillmor
Characterization of the viscoelastic and aging responses of poly [ethylene naphthalate] [PEN] is of increasing interest as this material begins to see greater use in commercial applications. In typical aging experiments, one quenches the glass transition

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

Preparation and Characterization of Polymer/Dendrimer Blends Progress Report 3/31/98

April 1, 1998
Author(s)
Eric J. Amis, Barry J. Bauer, A Topp, T J. Prosa, Da-Wei Liu, C L. Jackson, Alamgir Karim, B D. Ermi, K A. Barnes, A Nakatani, G Nisato, R Ivkov
Dendrimer and dendrigraft solutions, blends, and interpenetrating polymer networks are characterized by small angle neutron and x-ray scattering, reflectivity, and transmission electron microscopy.

USAXS Studies of Silica Fume Additives in Cements and Concrete

April 1, 1998
Author(s)
Andrew J. Allen, Richard A. Livingston
Supplementary cementitious materials like silica fume, which are added to the cement mix and react with calcium ions in the pore solution, enhance the production of calcium-silicate-hydrate gel and modify the microstructure in other ways. By combining

Pb-Distribution in a Five-Phase (Bi, Pd)-Sr-Ca-Cu-O Assemblage

March 12, 1998
Author(s)
Lawrence P. Cook, Winnie K. Wong-Ng
The partitioning of lead between phases in the nominal five-phase assemblage: (Pb,Bi) 3Sr 2Ca 2CuO x + (Ca,Sr) 2PbO 4 + (Bi,Pb) 2Sr 2CaCu 2O x + (Ca,Sr)O + Liquid has been investigated in an atmosphere of 7.5% O 2925% Ar. Samples were studied using a

Dynamic and Static Grain Growth During the Superplastic Deformation of 3Y-TZP

March 1, 1998
Author(s)
J Seidensticker, M J. Mayo
While phenomenological theories of superplasticity have often suffered from the fact that a single phenomenological law is not universally applicable to all superplastic systems, it is shown that a universal dynamic grain growth law does apply. The law is

Multiple Fiber Technique for the Single Fiber Fragmentation Test

March 1, 1998
Author(s)
Chang K. Moon, Walter G. McDonough
The single fiber fragmentation test has been modified by embedding multiple fibers into matrix resin. During testing, we examined the interfacial shear strengths between the fibers and the matrix. In addition, the time-dependent nature of the fragmentation

Small Angle Scattering by Dislocations

March 1, 1998
Author(s)
R Thomson, Lyle E. Levine, Gabrielle G. Long
It is shown that the small-angle scattering of x rays or neutrons by dislocations in a deformed metal, which are partially ordered into wall-like structures, is characterized by several structure factors. Principally there are associated with 1) a single

Structure Analysis of the 6H - Ba[Ti,Fe 3+ ,Fe 4+ ]O 3 -d^ Solid Solution

February 1, 1998
Author(s)
I E. Grey, C Li, L M. Cranswick, Robert S. Roth, Terrell A. Vanderah
The 6H form of BaTiO 3 forms an extensive solid solution with barium iron oxide, having the general formula BaTi 1-X-yFe 3+ xFe 4+ yO 3-δ, δ=x/2, where the Feu3+^/Fe 4+ ratio depends on reaction temperature and gas atmosphere. Solid solution members having

1997 NIST Ceramics Division Technical Activities

January 1, 1998
Author(s)
Stephen W. Freiman
The 1997 NIST Ceramics Division Report is organized in the form of programs, emphasizing a desire to develop more extensive collaborations among both Division and Materials Science and Engineering laboratory personnel, and to conduct focussed activities on
Displaying 1701 - 1725 of 1733
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