TY - JOUR
T1 - Effect of Sintering Temperature on Microstructure and Properties of Gas Pressure Sintered Ferrosilicon Nitride
AU - Guan, Jiasuo
AU - Cheng, Laifei
AU - Wang, Yaohui
AU - Li, Mingxing
AU - Zhang, Litong
N1 - Publisher Copyright:
© 2017, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.
PY - 2017/12/1
Y1 - 2017/12/1
N2 - Ferrosilicon nitride ceramics were fabricated via gas pressure sintering (GPS) using micron sized ferrosilicon nitride as a raw material and Al2O3-Y2O3 as sintering aids. The phase composition and microstructure of the specimens were analyzed by X-ray diffraction and scanning electronic microscopy, and the effect of sintering temperature on the microstructure and mechanical properties of ferrosilicon nitride ceramics was investigated. The results show that β-phase ferrosilicon nitride ceramic with a high density and good mechanical properties can be obtained by GPS. The density, flexural strength and fracture toughness of the samples firstly increase and then decrease with increasing the sintering temperature. The highest density, flexural strength and fracture toughness of the samples sintered at 1 770℃ are 3.31g/cm3, 435 MPa and 6.97 MPa·m1/2, respectively. Below 1 770℃, the main crystal phase is elongated columnar β-Si3N4, which is uniform and well-developed. The compact connection between the grains results in the less pores of grain boundaries. The reactions of iron containing phase and silicon nitride occur as sintering temperature further increases, leading to the increase of porosity and the decrease of flexural strength and fracture toughness. The non-nitrided iron-rich particles exist in the sintered bodies, which could be removed for the further increase of the mechanical properties of Fe-Si3N4 ceramic.
AB - Ferrosilicon nitride ceramics were fabricated via gas pressure sintering (GPS) using micron sized ferrosilicon nitride as a raw material and Al2O3-Y2O3 as sintering aids. The phase composition and microstructure of the specimens were analyzed by X-ray diffraction and scanning electronic microscopy, and the effect of sintering temperature on the microstructure and mechanical properties of ferrosilicon nitride ceramics was investigated. The results show that β-phase ferrosilicon nitride ceramic with a high density and good mechanical properties can be obtained by GPS. The density, flexural strength and fracture toughness of the samples firstly increase and then decrease with increasing the sintering temperature. The highest density, flexural strength and fracture toughness of the samples sintered at 1 770℃ are 3.31g/cm3, 435 MPa and 6.97 MPa·m1/2, respectively. Below 1 770℃, the main crystal phase is elongated columnar β-Si3N4, which is uniform and well-developed. The compact connection between the grains results in the less pores of grain boundaries. The reactions of iron containing phase and silicon nitride occur as sintering temperature further increases, leading to the increase of porosity and the decrease of flexural strength and fracture toughness. The non-nitrided iron-rich particles exist in the sintered bodies, which could be removed for the further increase of the mechanical properties of Fe-Si3N4 ceramic.
KW - Ferrosilicon nitride
KW - Gas pressure sintering
KW - Mechanical property
KW - Microstructure
UR - http://www.scopus.com/inward/record.url?scp=85045707526&partnerID=8YFLogxK
U2 - 10.14062/j.issn.0454-5648.2017.12.14
DO - 10.14062/j.issn.0454-5648.2017.12.14
M3 - 文章
AN - SCOPUS:85045707526
SN - 0454-5648
VL - 45
SP - 1818
EP - 1824
JO - Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society
JF - Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society
IS - 12
ER -
