[논문]Sintered-reaction Bonded Silicon Nitride Densified by a Gas Pressure Sintering Process - Effects of Rare Earth Oxide Sintering Additives

Lee, Sea-Hoon; Ko, Jae-Woong; Park, Young-Jo; Kim, Hai-Doo; Lin, Hua-Tay; Becher, Paul

doi:10.4191/kcers.2012.49.4.318

[국내논문] Sintered-reaction Bonded Silicon Nitride Densified by a Gas Pressure Sintering Process - Effects of Rare Earth Oxide Sintering Additives 원문보기

한국세라믹학회지 = Journal of the Korean Ceramic Society, v.49 no.4, 2012년, pp.318 - 324

Lee, Sea-Hoon (Engineering Ceramics Research Group, Korea Institute of Materials Science) , Ko, Jae-Woong (Engineering Ceramics Research Group, Korea Institute of Materials Science) , Park, Young-Jo (Engineering Ceramics Research Group, Korea Institute of Materials Science) , Kim, Hai-Doo (Engineering Ceramics Research Group, Korea Institute of Materials Science) , Lin, Hua-Tay (Materials Science and Technology Division, Oak Ridge National Laboratory) , Becher, Paul (Materials Science and Technology Division, Oak Ridge National Laboratory)

Abstract ▼ AI-Helper

Reaction-bonded silicon nitrides containing rare-earth oxide sintering additives were densified by gas pressure sintering. The sintering behavior, microstructure and mechanical properties of the resultant specimens were analyzed. For that purpose, $Lu_2O_3-SiO_2$ (US), $La_2O_3$-MgO (AM) and $Y_2O_3-Al_2O_3$ (YA) additive systems were selected. Among the tested compositions, densification of silicon nitride occurred at the lowest temperature when using the $La_2O_3$-MgO system. Since the $Lu_2O_3-SiO_2$ system has the highest melting temperature, full densification could not be achieved after sintering at $1950^{\circ}C$. However, the system had a reasonably high bending strength of 527 MPa at $1200^{\circ}C$ in air and a high fracture toughness of 9.2 $MPa{\cdot}m^{1/2}$. The $Y_2O_3-Al_2O_3$ system had the highest room temperature bending strength of 1.2 GPa.

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가설 설정

¹¹⁾ However, in spite of the formation of highly elongated grains as shown in Figs. 6(b) and (c), the fracture toughness of the AM was lower than the reported values.

제안 방법

The nitridation rate of the specimens was calculated by measuring the mass change after the nitridation process. The pore size distribution, phase formation and microstructure of the nitrided specimens were measured using a mercury porosimeter (Autopore 4, Micrometrics), X-ray powder diffraction (XRD, D/MAX 2200, Rigaku, Tokyo, Japan) and scanning electron microscopy (SEM, JSM 5800, Jeol, Tokyo, Japan), respectively.

대상 데이터

During GPS, the specimens were placed in a powder bed which was composed of the same amount of Si3N4 (Grand Chemical & Materials Co.) and BN (China Abrasive Import & Export Corp., 99%).
Si (Vesta ceramics, Grade 4, 99%), SiO₂ (Kosundo Chemical, 99.9%), MgO (Sigma-Aldrich, 99.99%), Lu₂O₃ (Alfa Aesar, 99.9%), La₂O₃ (Sigma-Aldrich, 99.99%), Al₂O₃ (Smitomo, AKP-30) and Y₂O₃ (H. C. Starck, Grade C) were used as starting materials. The amounts of sintering additives and the mass ratio between Lu₂O₃ : SiO₂ (termed US), La₂O₃ : MgO (termed AM) and Y₂O₃ : Al₂O₃ (termed YA) were fixed to 10 wt% and 8 : 2 by weight, respectively.

이론/모형

7. Fracture toughness of specimens measured by the SENB method.

성능/효과

The deterioration was the most distinct in the AM among the tested specimens. The results indicated that the viscosity of the La₂O₃-MgO-SiO₂ based grain boundary phase was lower than that of Y₂O₃-Al₂O₃-SiO₂. The high temperature strength of the US was similar to that of the YA (527 vs.

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상세보기
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상세보기
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원문보기 상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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[국내논문] Sintered-reaction Bonded Silicon Nitride Densified by a Gas Pressure Sintering Process - Effects of Rare Earth Oxide Sintering Additives 원문보기

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[국내논문] Sintered-reaction Bonded Silicon Nitride Densified by a Gas Pressure Sintering Process - Effects of Rare Earth Oxide Sintering Additives 원문보기

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