Sinter forging of rapidly quenched eutectic Al 2O 3–ZrO 2(Y 2O 3)-glass powders
Spray dried agglomerates of Al 2O 3–ZrO 2 (1% Y 2O 3) with 4 wt.% borosilicate glass were arc plasma sprayed and rapidly quenched into water. Because of the rapid quenching the particles <25 μm were mostly amorphous. After annealing 1 h at 1200 °C the scale of the microstructure of the particles...
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Published in | Journal of the European Ceramic Society Vol. 25; no. 8; pp. 1359 - 1364 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
2005
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Subjects | |
Online Access | Get full text |
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Summary: | Spray dried agglomerates of Al
2O
3–ZrO
2 (1% Y
2O
3) with 4
wt.% borosilicate glass were arc plasma sprayed and rapidly quenched into water. Because of the rapid quenching the particles <25
μm were mostly amorphous. After annealing 1
h at 1200
°C the scale of the microstructure of the particles was on the order 30
nm. Hot forging of this powder yielded dense specimens with the width of the ZrO
2 phase still less than 100
nm. Since the particle size ranged from 5 to 25
μm and the scale of the particle microstructure was <100
nm, densification was controlled by creep of the particles rather than by the typical hot pressing mechanism of diffusion along the neck between particles to fill the pores. Thus, the scale of the microstructure controls densification rather than the particle size. These powders offer an alternate source for manufacturing nanostructured parts and should be more suitable for hot pressing or forging than nanoparticulate powders. |
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ISSN: | 0955-2219 1873-619X |
DOI: | 10.1016/j.jeurceramsoc.2005.01.010 |