Improvement of OSC performance for CeZrO4 solid solution with Al2O3 diffusion barrier

Morikawa, Akira; Suzuki, Tadashi; Kikuta, Koichi; Suda, Akihiko; Shinjo, Hirofumi

doi:10.14382/epitoanyag-jsbcm.2009.1

Cited by 12 publications

(8 citation statements)

References 2 publications

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“…In the last 15-20 years the engineers and experts working in ceramic manufacturing plants and scientists working in laboratories of universities and research institutions have been engaged into development of more effi cience ceramic materials and items for diff erent industrial purposes [1,2,3,4]. Till today several kinds of ceramic materials and ceramic matrix composites are developed with high values of mechanical strength and hardness [5, 6.…”

Section: Introductionmentioning

confidence: 99%

Alumina-based hetero-modulus ceramic composites with extreme dynamic strength – phase transformation of Si3N4 during high speed collisions with metallic bodies

Gömze¹,

Gömze²

2009

Epitoanyag - JSBCM

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Till today several kinds of ceramics and ceramic matrix composites are developed for extreme environmental conditions. Most of these ceramics have microstructures with relatively "big" crystals, having high rigidness and strong inclination to nick, pitting and rigid fractures, so they are not usable for collision with metallic or other bodies under high speeds like 800 m/sec or more. On the basis of several years experiments in development and testing of ceramic materials and corundum matrix composites the authors successfully developed new alumina-matrix composite materials reinforced with Si 2 ON 2 , SiAlON, AlN and Si 3 N 4 . These new alumina based ceramic matrix composites were tested under collisions with different metallic bodies having high densities and speeds higher than 800 m/sec. During the collisions the kinetic energy of flying metallic objects distributing to fracture energies, heatings and recrystallizations both of ceramic and metallic bodies. In the centres of collisions, where oxygen was absent, the authors have found new, high density "diamond-like Si 3 N 4 " materials with cubic crystals, where nitrogen atoms distributed in the centres of the cubes. These new crystal structures of Si 3 N 4 in the alumina matrix have extreme dynamic strength and hardness, like diamond. Having surplus of oxygene in the centres of collisions this new "diamond-like Si 3 N 4 " was not observed, when a very strong oxydation of metallic bodies was taken place. Using the energy conception of collision, the authors mathematically described the energy engorgements of destruction of ceramic materials and heating of participating bodies as well as energy engorgement used for the phase transformations of ceramic and metallic particles during their collision.

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Section: Introductionmentioning

confidence: 99%

Alumina-based hetero-modulus ceramic composites with extreme dynamic strength – phase transformation of Si3N4 during high speed collisions with metallic bodies

Gömze¹,

Gömze²

2009

Epitoanyag - JSBCM

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“…Nowadays, ceramic items are normally produced with materials having submicron and nanoparticles [24][25][26][27][28]. The raw materials mined at the European ceramic brick and roof-tile plants usually contain considerable proportions of clay minerals, phyllosilicates, layered and amorphous silicate materials [29][30][31][32][33][34], and have submicron particles in different ratios with different specific surface area and grain size distribution.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Mechanochemical Phenomena during Fine Comminution of Clay Minerals for Ceramic Bricks and Roof-Tiles

Gömze

2010

MSF

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Abstract. During the fine comminution of clay minerals and layered silicate materials with relative large volume of specific surface area appreciable changes in chemical and minerological compositions can be observed. In this paper is described the mechanochemical investigation of conventional clay minerals from "Lenti" region (Hungary), having natural BET specific surface larger than 35-40 square metres per grams. The laboratory experiments made by author had shown an intensive reduction of specific surface volume at the beginning of grinding, further relatively slow growth and reduction of BET and Langmuir surfaces were observed. The content of mineral Muscovite-2M1 -(K, NH4Na)Al2(SiAl)4O10(OH)2 -has decreased and the contents of QuartzSiO2 -and Illite-1M (NR) -KO.7Al2(SiAl)4O10(OH)2 -have increased considerable depending on grinding time. Increasing the milling time the amount of Albite -NaAlO.91Si3O8 -and other mineral components were also not stable, but their content have varied not so strong as Muscovite-2M1 or Quartz and Illite-1M. The examined clay minerals had a certain proportion of amorphous particles as well, but in this contribution only the changes in proportions of crystalline particles are described.

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“…In our days the industry requires more and more low density and mechanically strong materials capable to work in high temperature environment. To satisfy these inquires more and more ceramics [1][2][3][4][5][6][7] and ceramic matrix composites [8,9] or cermets [10,11] are applied. To increase the wear resistance and live times of machine parts or machine tools very often hard ceramic coatings and ceramic based composites are used [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Influence of Sintering Atmosphere and IG-017 Bio-Original Additives on Porosity of Ceramics Made from High Purity Al2O3 and SiO2 Powders

Kurovics¹,

Gömze²

2017

The Publications of the MultiScience - XXXI. MicroCAD International Scientific Conference

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Using high purity alumina and quartz powders and IG-017 bio-original additives of Igrex Ltd. the authors have developed new ceramic composite materials which can be applied in different industrial environment. The main goal was to fine a material and morphological structures of high performance ceramic composites as frames for development complex materials for extreme consumptions. For this the mixed powders of Al 2 O 3 , SiO 2 and IG-017 bio-original additive were uniaxially pressed at different compaction pressures into cylindrical shapes and were sintered in electric kiln under oxidation (1) and nitrogen (2) atmosphere. The grain size distribution of the raw materials was determined by laser granulometry. There thermo-physical properties were also determined by derivatography. The prepared and sintered specimens were tested on geometrical sizes, porosity and mechanical strength. In this work the authors present the results of their research and investigation.

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Improvement of OSC performance for CeZrO4 solid solution with Al2O3 diffusion barrier

Cited by 12 publications

References 2 publications

Alumina-based hetero-modulus ceramic composites with extreme dynamic strength – phase transformation of Si3N4 during high speed collisions with metallic bodies

Alumina-based hetero-modulus ceramic composites with extreme dynamic strength – phase transformation of Si3N4 during high speed collisions with metallic bodies

Mechanochemical Phenomena during Fine Comminution of Clay Minerals for Ceramic Bricks and Roof-Tiles

Influence of Sintering Atmosphere and IG-017 Bio-Original Additives on Porosity of Ceramics Made from High Purity Al2O3 and SiO2 Powders

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