Aluminium Phosphate Bonded Oxide Fibre Reinforced Porous Mullite‐Based Matrix Composites

Holmquist, M.; Hoffer, L; Kristoffersson, Annika; Lundberg, Robert

doi:10.1002/3527605622.ch95

Cited by 2 publications

(4 citation statements)

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“…The mechanical properties of the investigated composites are summarized in Table II. The obtained values are high compared with published data of other porous‐matrix oxide/oxide composites 2,4,5–7,12–18 . Representative tensile stress–strain curves are plotted in Fig.…”

Section: Oxide/oxide Composite Propertiessupporting

confidence: 66%

“…Different approaches in the design of porous matrices, including aluminasilica, mullite-silica, alumina, mullite, and mullite-alumina-based systems, have been investigated. 2,3,7,[12][13][14][15][16][17] Among these CFCCs those with the mullite-alumina matrix have demonstrated the best long-term stability up to now. 18 However, because of the excellent creep resistance of mullite compared with alumina or silica, further improvements can be expected if a pure mullite matrix is used.…”

Section: Methodsmentioning

confidence: 99%

“…On the other hand, the matrix should show a very fine and homogeneously distributed pore structure that can be retained in service over long periods at elevated temperatures. Different approaches in the design of porous matrices, including alumina–silica, mullite–silica, alumina, mullite, and mullite–alumina‐based systems, have been investigated 2,3,7,12–17 . Among these CFCCs those with the mullite–alumina matrix have demonstrated the best long‐term stability up to now 18 .…”

Section: Composite Processing—colloidal Routementioning

confidence: 99%

“…The obtained values are high compared with published data of other porousmatrix oxide/oxide composites. 2,4,[5][6][7][12][13][14][15][16][17][18] Representative tensile stress-strain curves are plotted in Fig. 8 and compared with data from researchers at the University of California at Santa Barbara (UCSB) obtained from N610/MA (Nextelt 610/mullite-alumina) and N720/ MA (Nextelt 720/mullite-alumina) composites.…”

Section: Mechanical Properties Of As-processed Compositesmentioning

confidence: 99%

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Progress in Processing and Performance of Porous‐Matrix Oxide/Oxide Composites

Simon

2005

Int J Applied Ceramic Tech

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All‐oxide continuous fiber‐reinforced ceramic matrix composites are enabling materials for high‐temperature structural applications in oxidizing environments. However, their industrial use requires further improvements in material performance as well as a significant reduction of the processing costs. This article gives some insight into a novel colloidal processing route. A porous mullite matrix was designed to obtain damage‐tolerant behavior as well as high‐temperature long‐term stability. Laminated composites were formed with conventional techniques similar to the manufacture of polymer matrix composites. This simple and low‐cost process leads to homogeneous microstructures with improved material properties compared with the state of the art in continuous fiber‐reinforced oxide/oxide composites. The developed composites in the present study exhibit favorable mechanical properties both at room temperature and after thermal aging for 1000 h at temperatures up to 1300°C.

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Section: Oxide/oxide Composite Propertiessupporting

confidence: 66%

Section: Methodsmentioning

confidence: 99%

Section: Composite Processing—colloidal Routementioning

confidence: 99%

Section: Mechanical Properties Of As-processed Compositesmentioning

confidence: 99%

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Progress in Processing and Performance of Porous‐Matrix Oxide/Oxide Composites

Simon

2005

Int J Applied Ceramic Tech

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Oxide Fiber Composites with Promising Properties for High‐Temperature Structural Applications

Simon

Dänzer

2006

Adv Eng Mater

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room temperature, resulting in mechanical collapse of the coating. This loss of mechanical integrity could also be promoted by massive internal oxidation of the CrN skeleton and, thus, formation of brittle Cr oxides. ConclusionsThe aim of this work was the verification of the high-temperature lubrication concept of CrN coatings containing Ag (Ag contents of 12 at.% and 22 at.%, respectively). As-deposited coatings show a phase-separated structure consisting of CrN and Ag grains with domain sizes of 15±25 nm and 5±10 nm, respectively. The friction coefficient against alumina at room temperature increases slightly from 0.4 to 0.5 with higher Ag contents. Also wear is pronounced in case of higher Ag contents, which is related to the lower hardness of these coatings. During annealing at 600 C, Ag agglomerates form on the coating surface and decrease the friction coefficient to 0.2 at the beginning of the test. With increasing sliding distance, the value increases to 0.40±0.44. This increase is attributed to fast out-diffusion of Ag and, in turn, a quick consumption of the lubricating phase. The remaining porous CrN skeleton lacks sufficient resistance to wear, causing the formation of abrasive debris and the rapid coating degradation after the Ag reservoir is exhausted.Finally, it can be concluded that alloying CrN coatings with Ag offers a high potential to enhance the tribological behavior in a wide temperature range and under varying environmental conditions, provided that the supply of the sliding contact with the Ag lubricant is controlled thoroughly.

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Aluminium Phosphate Bonded Oxide Fibre Reinforced Porous Mullite‐Based Matrix Composites

Cited by 2 publications

References 0 publications

Progress in Processing and Performance of Porous‐Matrix Oxide/Oxide Composites

Progress in Processing and Performance of Porous‐Matrix Oxide/Oxide Composites

Oxide Fiber Composites with Promising Properties for High‐Temperature Structural Applications

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