Multicomponent toughened ceramic materials obtained by reaction sintering

1985 ◽  
Vol 20 (6) ◽  
pp. 2011-2022 ◽  
Author(s):  
P. Pena ◽  
P. Miranzo ◽  
J. S. Moya ◽  
S. De Aza
Keyword(s):  
Ceramic Materials ◽  
Reaction Sintering

Multicomponent toughened ceramic materials obtained by reaction sintering

1985 ◽  
Vol 20 (8) ◽  
pp. 2711-2718 ◽  
Author(s):  
M. F. Melo ◽  
J. S. Moya ◽  
P. Pena ◽  
S. De Aza
Keyword(s):  
Ceramic Materials ◽  
Reaction Sintering

Reaction Sintering of Ceramic Materials by Microwave Heating

1992 ◽  
Vol 269 ◽  
Author(s):  
Ph. Boch ◽  
N. Lequeux ◽  
P. Piluso
Keyword(s):  
Microwave Heating ◽  
Ceramic Materials ◽  
Reaction Sinter ◽  
Conventional Heating ◽  
Reaction Sintering ◽  
Aluminum Titanate ◽  
Powder Mixtures ◽  
Titanate Ceramics

ABSTRACTMicrowave heating was used to reaction sinter Al2O3 + SiO2 and Al2O3 + TiO2 powder mixtures to prepare mullite and aluminum titanate ceramics, respectively. In comparison with conventional heating, microwave heating leads to a decrease in the temperatures of treatment of 50 to 100°C.

Sintering Procedure of Calcium Hexaluminate Ceramics

2012 ◽  
Vol 468-471 ◽  
pp. 1022-1025
Author(s):  
Yuan Li
Keyword(s):  
Thermal Expansion ◽  
Intermediate Phase ◽  
Slip Casting ◽  
Ceramic Materials ◽  
Reaction Sintering ◽  
Thermal Expansion Behavior ◽  
Expansion Behavior ◽  
Calcium Hexaluminate ◽  
Expansion Curve ◽  
Thermal Expansion Curve

Thermal expansion behavior of ceramic green bodies could be used to determine appropriate sintering procedure for ceramic materials. In this paper, green bodies containing alumina and calcium hydroxide was prepared by slip casting and their thermal expansion behavior was measured. Thermal expansion curve indicated that calcium aluminate (CaO•Al2O3, CA) and calcium dialuminate (CaO•2Al2O3, CA2) are yielded by reaction sintering as intermediate phase compounds in green samples at temperature about 1160°C and 1240°C-1410°C, respectively; and calcium hexaluminate (CaO•6Al2O3, CA6) is yielded as target product at 1450°C-1560°C. Controlled sintering procedure was determined according to thermal expansion curve of green samples. Analysis result to properties of sintered samples indicated that thermal expansion behavior revealed to be a very simple and powerful tool to determine reaction sintering procedure of calcium hexaluminate ceramics.

Multicomponent toughened ceramic materials obtained by reaction sintering

1985 ◽  
Vol 20 (8) ◽  
pp. 2702-2710 ◽  
Author(s):  
P. Miranzo ◽  
P. Pena ◽  
J. S. Moya ◽  
S. De Aza
Keyword(s):  
Ceramic Materials ◽  
Reaction Sintering

Structural Ceramic Materials Under Development

1975 ◽  
Author(s):  
F. F. Lange
Keyword(s):  
Silicon Carbide ◽  
High Temperature ◽  
Silicon Nitride ◽  
Stress Analysis ◽  
Structural Design ◽  
Hot Pressing ◽  
Ceramic Materials ◽  
Reaction Sintering ◽  
Structural Ceramic ◽  
Conventional Sintering

A variety of different promising high temperature structural materials exist under the generic names of silicon nitride (Si3N4) and silicon carbide (SiC). Each of these materials are fabricated by a different method and thus, each develop different microstructures and different properties. The relations between fabrication, microstructure and properties will be reviewed for both Si3N4 and SiC fabricated by (a) reaction-sintering, (b) conventional sintering, and (c) hot-pressing. The object of this review is to allow the engineer to obtain a better understanding of the different materials that are becoming available for high temperature structural design applications. An Appendix presents the properties of these materials required for stress analysis.

scholarly journals Densification and Microstructural Evolutions during Reaction Sintering of SiC-Si-C Powder Compacts

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
H. Asgharzadeh ◽  
N. Ehsani
Keyword(s):  
Powder Mixture ◽  
Coming Out ◽  
Sintering Temperature ◽  
Ceramic Materials ◽  
Carbon Powder ◽  
Reaction Sintering ◽  
Ceramic Specimen ◽  
Powder Compacts ◽  
Porous Sic ◽  
Sic Particle

Porous SiC-Si-C ceramics were produced by reaction sintering (RS) of silicon carbide, silicon, and carbon powder compacts in the temperature range of 1400–1600°C. The effects of chemical composition of the starting powder, initial SiC particle size, and reaction sintering temperature and duration on the densification and microstructure of ceramic materials were studied. The results showed that increasing the amount of Si and/or C powders in the starting powder mixture had a detrimental influence on the densification of ceramic material as a result of higher amount of remained silicon and carbon phases in the ceramic specimen. Increasing the RS temperature also degraded densification due to the melting of Si and coming out of it from compact during heating. Nevertheless, densification was improved by increasing the RS duration. Using nanometric SiC particles in the starting powder mixture improved the densification compared to that of micrometric ones especially at longer RS processing duration.

scholarly journals Texture in Aluminum Titanate Ceramic Materials

1995 ◽  
Vol 24 (1-3) ◽  
pp. 143-154
Author(s):  
C. Schmalzried ◽  
J.-W. Kim ◽  
H. W. Hennicke
Keyword(s):  
Ceramic Material ◽  
Ceramic Materials ◽  
Green Compact ◽  
Reaction Sintering ◽  
Aluminum Titanate ◽  
Dry Pressing ◽  
Titanate Ceramic

Dry pressing and filtration of a mixture of platelike corundum and rutile powders shows a slight to sharp texture of the corundum particles. The reaction sintering forming aluminum titanate destroys the texture of the green compact. When starting with a rutile texture in the green compact there exists a texture of tielite in the reaction product. Furthermore we developed a process for production of platelike tielite monocrystalline particles which should be very suited for texturing of the ceramic material.

The effect of the dispersed composition of SiC on the physical and mechanical properties of reactionsintered silicon carbide

2020 ◽  
pp. 41-45
Author(s):  
S. N. Perevislov ◽  
M. A. Markov ◽  
A. V. Krasikov ◽  
A. D. Bykova
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Grain Size ◽  
Physical And Mechanical Properties ◽  
Ceramic Materials ◽  
Reaction Sintering ◽  
Dense Ceramic

We obtain dense ceramic materials of silicon carbide by reaction sintering, with high mechanical properties. The effect of different dispersed composition of silicon carbide powders on the microstructure, grain size after sintering, as well as physical and mechanical properties is shown.

Examination of Fracture Interfaces in Silicon Nitride

1975 ◽  
Vol 33 ◽  
pp. 60-61
Author(s):  
Nancy J. Tighe
Keyword(s):  
Silicon Nitride ◽  
Grain Boundary ◽  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Slow Crack Growth ◽  
Ceramic Materials ◽  
Grain Boundary Sliding ◽  
Boundary Phase ◽  
Turbine Engines ◽  
Boundary Sliding

Silicon nitride is one of the ceramic materials being considered for the components in gas turbine engines which will be exposed to temperatures of 1000 to 1400°C. Test specimens from hot-pressed billets exhibit flexural strengths of approximately 50 MN/m2 at 1000°C. However, the strength degrades rapidly to less than 20 MN/m2 at 1400°C. The strength degradition is attributed to subcritical crack growth phenomena evidenced by a stress rate dependence of the flexural strength and the stress intensity factor. This phenomena is termed slow crack growth and is associated with the onset of plastic deformation at the crack tip. Lange attributed the subcritical crack growth tb a glassy silicate grain boundary phase which decreased in viscosity with increased temperature and permitted a form of grain boundary sliding to occur.

Stress-Induced Ordering in Y203-Stabilized Tetragonal Zr02

1985 ◽  
Vol 43 ◽  
pp. 222-223
Author(s):  
J. Y. Koo ◽  
M. P. Anderson
Keyword(s):  
Electron Diffraction ◽  
Ionic Conduction ◽  
Electron Diffraction Study ◽  
Ceramic Materials ◽  
Bright Field Image ◽  
Transformation Toughening ◽  
Ion Milling ◽  
Thin Foils ◽  
Carbon Coated ◽  
Convergent Beam

Tetragonal Zr02 has been used as a toughening phase in a large number of ceramic materials. In this system, complex diffraction phenomena have been observed and an understanding of the origin of the diffraction effects provides important information on the nature of transformation toughening, ionic conduction, and phase destabilization. This paper describes the results of an electron diffraction study of Y203-stabilized, tetragonal Zr02 polycrystals (Y-TZP).Thin foils from the bulk Y-TZP sample were prepared by careful grinding and cryo ion-milling. They were carbon coated and examined in a Philips 400T/FEG microscope. Fig. 1 shows a typical bright field image of the 100% tetragonal(t) Zr02. The tetragonal structure was identified by both bulk x-ray diffraction and convergent beam electron diffraction (Fig. 2. A local region within a t-Zr02 grain was subjected to an intense electron beam irradiation which caused partial martensitic transformation of the t-Zr02 to monoclinic(m) symmetry, Fig. 3 A.

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