In:
International Journal of Materials Research, Walter de Gruyter GmbH, Vol. 104, No. 7 ( 2013-07-11), p. 675-679
Abstract:
ZrO 2 impurity phase was examined by means of X-ray diffraction and scanning electron microscopy in reactive-sintered ZrB 2 –SiC–ZrC composites hot-pressed at 1600°C and 1800°C. An analytical electron microscopy study further revealed solid-solution of both Zr and O in the β-SiC phase: Zr:Si ratios were measured to be 1.83 ± 0.17 × 10 −2 and 1.91 ± 0.16 × 10 −2 respectively for each sample, while O:Si ratios were in the range of 2.3 ∼ 2.8 × 10 −2 . Common co-existence of ZrO 2 grains and SiC grains containing Zr–O solutes indicates that this oxide plays a significant role in the sintering process, which substantially modifies the reactive phase relations. Observation of an intergranular Si–Zr–C–O glassy phase suggests the presence of a similar sintering liquid as a fast or even dominant diffusion path to promote the reactive sintering.
Type of Medium:
Online Resource
ISSN:
2195-8556
,
1862-5282
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
2013
detail.hit.zdb_id:
2232675-3
detail.hit.zdb_id:
2128058-7
detail.hit.zdb_id:
203021-4
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