نتایج جستجو برای: co continuous ceramic composite

تعداد نتایج: 722097  

In plasma sprayed nanostructured composite coatings with ceramic matrix, the feedstock must consist of nanoparticles of appropriate specifications. In this research, the procedure for production of Cr2O3-Ag agglomerated nanostructured composite powder to produce comosite coatings has been investigated. Nanopowders of Cr2O3 with 0, 2, 5, and 10 volume percentages of silver were dispersed to obta...

Journal: :European journal of orthodontics 2013
Frank Falkensammer Erwin Jonke Michael Bertl Josef Freudenthaler Hans Peter Bantleon

The objective of this study was to investigate the rebonding effect of a new silane coupling agent on various ceramic brackets bonded to ceramic specimen. Different ceramic brackets (Fascination 2, Clarity SL, and In-OvationC) were assigned to three groups: rebonding with new silane coupling agent, rebonding with conventional silane coupling agent, or regular bonding as control (n = 16). Bracke...

2003
Y. J. He

The friction and wear behaviour of ZrO*-Y203, Zr02-Y203--Ce02 and ZrQ--A1203 composite ceramics against hardened steel AISI-52100 were investigated using a pin on plate configuration under reciprocating motion. The reproducibility of the results was examined in this configuration. Wear characteristics were separated into system and material contributions. Under the conditions used, all the cera...

2008
M. C. Runyan

We present measurements of the low-temperature thermal conductivity of a number of polymeric and composite materials from 0.3 to 4 K. The materials measured are Vespel SP-1, Vespel SP-22, unfilled PEEK, 30% carbon fiber-filled PEEK, 30% glass-filled PEEK, carbon fiber Graphlite composite rod, Torlon 4301, G-10/FR-4 fiberglass, pultruded fiberglass composite, Macor ceramic, and graphite rod. The...

The effect of milling on the particle size and mechanical properties Tungsten Carbide - Cobalt composite were investigated. First, raw materials ratios by mechanical milling for 4 hours at 300 rpm were mixed. The powder in the optimum temperature 1350°C at a rate of temperature rise 50°C / min and shelf life of 4 minutes and the pressure MPa 30 were sintered in SPS. The results indicated nearly...

2015
Yousef A AlJehani Jagan K Baskaradoss Amrita Geevarghese Marey A AlShehry Pekka K Vallittu

BACKGROUND With the increase in demand for cosmetics and esthetics, resin composite restorations and all-ceramic restorations have become an important treatment alternative. Taking into consideration the large number of prosthodontic and adhesive resins currently available, the strength and durability of these materials needs to be evaluated. This laboratory study presents the shear bond streng...

2008
J. C. Nelson J. W. Barlow

A computer model for the sintering of ceramic/polymer composite materials has been established based on empirical sintering rate data. The model calculates sintering depths which result from variations in the operating parameters which include laser power, beam speed, scan spacing, scan vector length, and initial temperatures of the powder and surroundings. Sintering depths measured in multiple...

2017
Jingming Xu Ki Tae Nam

Inspired by composite materials in nature, e.g. bone, with both sufficient mechanical strength and permeability, we designed and fabricated hierarchically organized channels with tapered cross-sections inside a bioceramic. A novel pressurized sintering process was developed to enable the fabrication. The tapering of the cross-sections of the channels was along the channel length and controlled ...

ابراهیمی, خسرو,

Zonous Kaol ini te bea ring c lay de pos it is made by hydrothermal alteration of volcanic rocks mainaly of andesite ami dacite. Kao linit e , quartz and calci te are the main mineral co mposi tions. As quart z in the volcanic roc ks is cryptocrys talline, it is too dificult to seperat e it from kaol inite. The phys ical properties and chemica l composition of Zonous ceramic grade kaolinit...

Journal: :The Journal of prosthetic dentistry 2017
Jieyin Li Chaojie Chen Juankun Liao Lang Liu Xiuhua Ye Shiyao Lin Jiantao Ye

STATEMENT OF PROBLEM Cobalt-chromium (Co-Cr) alloys have been widely used for metal-ceramic fixed prostheses and can be fabricated using conventionally cast or new computer-aided technology. However, the effect of different manufacturing methods on the metal-ceramic bond strength needs further evaluation. PURPOSE The purpose of this in vitro study was to evaluate the metal-ceramic bond streng...

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