烧结助剂种类对Si3N4/SiC陶瓷力学与摩擦性能的影响

doi:10.15541/jim20140181

摘要/Abstract

摘要：

分别以Y₂O₃-Al₂O₃(YA)和Y₂O₃-MgO(YM)为烧结助剂, 采用气压烧结工艺制备了Si₃N₄/SiC陶瓷, 研究了两种不同的烧结助剂对陶瓷的力学和摩擦性能的影响。研究结果表明: 添加不同种类的烧结助剂对制备陶瓷的相对密度、抗弯强度、断裂韧性、硬度、摩擦系数和磨损率影响很大; 与添加烧结助剂YM相比较,添加烧结助剂YA的Si₃N₄/SiC陶瓷在烧结过程中表现出了更好的烧结性能, 得到的陶瓷样品最终显示了更好的力学和摩擦性能, 尤其是SiC添加量为20wt%的Si₃N₄/SiC陶瓷。这主要归因于烧结助剂YA的添加使Si₃N₄/SiC陶瓷呈现出了更高的相对密度, 获得的晶粒长径比更小。

关键词: Si3N4/SiC陶瓷, 烧结助剂, 抗弯强度, 摩擦性能

Abstract:

Two compositions of the Y₂O₃-Al₂O₃(YA) and Y₂O₃-MgO (YM) systems were chosen to investigate the effect of sintering additive composition on the mechanical and tribological properties of gas pressure sintered Si₃N₄/SiC ceramics. The relative density, flexural strength, fracture toughness, hardness, coefficient of friction and wear rate were verified to depend substantially on the sintering additive composition. Compared with YM, the Si₃N₄/SiC ceramics with YA exhibit superior sinterability and show preferable mechanical and tribological properties, especially for the Si₃N₄/SiC ceramics with 20wt% SiC addition. These properties can be primarily attributed to the higher relative density and the grain size with smaller aspect ratio.

Key words: Si3N4/SiC ceramics, sintering additive, flexural strength, tribological properties

中图分类号:

TQ174

胡海龙, 曾宇平, 左开慧, 夏咏锋,姚冬旭. 烧结助剂种类对Si₃N₄/SiC陶瓷力学与摩擦性能的影响[J]. 无机材料学报, 2014, 29(8): 885-890.

HU Hai-Long, ZENG Yu-Ping, ZUO Kai-Hui, XIA Yong-Feng, YAO Dong-Xu. Effect of Sintering Additive Composition on the Mechanical and Tribological Properties of Si₃N₄/SiC Ceramics[J]. Journal of Inorganic Materials, 2014, 29(8): 885-890.

图/表 9

Fig. 1 XRD patterns of the sintered Si3N4/SiC ceramics with different sintering additives for various contents of SiC addition (a) With YA sintering additive; (b) With YM sintering additive

Fig. 2 Relative density of the sintered Si3N4/SiC ceramics with YA or YM sintering additive for various contents of SiC

Fig. 3 SEM fracture morphologies of the sintered Si3N4/SiC ceramics with YA sintering additive for (a) without SiC, (b) 20wt% SiC, (c) 40wt% SiC and (d) 60wt% SiC addition

Fig. 4 SEM fracture morphologies of the sintered Si3N4/SiC ceramics with YM sintering additive for (a) without SiC, (b) 20wt% SiC, (c) 40wt% SiC and (d) 60wt% SiC addition

Fig. 5 Flexural strength of the sintered Si3N4/SiC ceramics with YA or YM sintering additive for various contents of SiC

Fig. 6 SEM images of worn surface of the sintered Si3N4/SiC ceramics with YA sintering additive for (a) without SiC, (b) 20wt% SiC, (c) 40wt% SiC and (d) 60wt% SiC addition

Fig. 7 SEM images of worn surface of the sintered Si3N4/SiC ceramics with YM sintering additive for (a) without SiC, (b) 20wt% SiC, (c) 40wt% SiC and(d) 60wt% SiC addition

Fig. 8 Average coefficient of friction and wear rate of the sintered Si3N4/SiC ceramics with YA or YM sintering additive

Table 1 Elastic modulus, hardness and fracture toughness of the sintered Si3N4/SiC ceramics with YA or YM sintering <br/>additive for various contents of SiC

Samples	Elastic modulus/GPa	Hardness/GPa	Fracture toughness/(MPa•m^½)
YA	271	10.8±0.24	4.02±0.03
YA-20wt%SiC	311	14.6±0.10	4.12±0.01
YA-40wt%SiC	272	13.5±0.39	3.92±0.22
YA-60wt%SiC	251	11.8±0.35	3.93±0.02
YM	187	5.8±0.14	4.06±0.04
YM-20wt%SiC	242	10.3±0.39	4.93±0.13
YM-40wt%SiC	176	5.8±0.20	4.24±0.04
YM-60wt%SiC	142	3.6±0.15	2.92±0.12

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烧结助剂种类对Si₃N₄/SiC陶瓷力学与摩擦性能的影响

Effect of Sintering Additive Composition on the Mechanical and Tribological Properties of Si₃N₄/SiC Ceramics

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