Improved mechanical properties of Al2O3-25 vol% SiCw composites prepared by oscillatory pressure sintering

Zhu, Tianbin; Xie, Zhipeng; Han, Yao; Li, Shuang; An, Di; Luo, Xudong

doi:10.1016/j.ceramint.2017.08.087

Cited by 32 publications

(14 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As shown in Figure 7B, the flexural strength improves initially and then degrades with the SiCw content. The maximum flexural strength of 1314.0 MPa is achieved at 20.0 wt% SiCw, which is significantly higher than those of Al 2 O 3 ceramics (400‐600 MPa) and Al 2 O 3 ‐based composites (639‐1207 MPa) reported previously 3,45‐48 . The fracture toughness also rises firstly but afterward reduces with the addition of SiCw, and the maximum value of 14.7 MPa m 1/2 is obtained at 13.0 wt% SiCw.…”

Section: Resultsmentioning

confidence: 65%

“…The maximum flexural strength of 1314.0 MPa is achieved at 20.0 wt% SiCw, which is significantly higher than those of Al 2 O 3 ceramics (400-600 MPa) and Al 2 O 3 -based composites (639-1207 MPa) reported previously. 3,[45][46][47][48] The fracture toughness also rises firstly but afterward reduces with the addition of SiCw, and the maximum value of 14.7 MPa m 1/2 is obtained at 13.0 wt% SiCw. Figure 8A illustrates the SEM image of the original SiCw used in our study, showing the relatively high purity of the whiskers.…”

Section: The Influence Of Sicpmentioning

confidence: 98%

See 1 more Smart Citation

Preparation, mechanical properties, and toughening mechanisms of SiCw/SiCp‐reinforced zirconia‐toughened alumina ceramics

Liu

Chen

et al. 2020

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

Zirconia‐toughened alumina (ZTA) ceramics with high mechanical properties were sintered by hot‐pressing method using SiC particles (SiCp) and SiC whiskers (SiCw) as the reinforcing agents simultaneously. The influences of sintering temperature, SiCp, and SiCw contents on the microstructure and mechanical properties of ZTA ceramics were investigated. It was found that both SiCp and SiCw could contribute to grain refinement significantly and promote the mechanical properties of the ceramics. However, the excess addition of SiCp or SiCw led to the formation of pores with large sizes and degraded the mechanical properties instead. When 13 wt% SiCp was introduced, the maximum flexural strength of 1180.0 MPa and fracture toughness of 15.9 MPa·m1/2 were obtained, whereas the maximum flexural strength of 1314.0 MPa and fracture toughness of 14.7 MPa·m1/2 were achieved at 20 wt% SiCw. Interestingly, the simultaneous addition of SiCp and SiCw could further improve the mechanical properties, and the highest flexural strength of 1334.0 MPa and fracture toughness of 16.0 MPa·m1/2 were achieved at a SiCw/SiCp ratio of 16/4. The reinforcement mechanisms in the ceramics mainly included the phase transformation toughening of ZrO2, the crack deflection and bridging of SiCp and SiCw, and the pull‐out of SiCw.

show abstract

Section: Resultsmentioning

confidence: 65%

Section: The Influence Of Sicpmentioning

confidence: 98%

Preparation, mechanical properties, and toughening mechanisms of SiCw/SiCp‐reinforced zirconia‐toughened alumina ceramics

Liu

Chen

et al. 2020

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…陶瓷是典型的脆性材料, 具有抗压强、抗拉弱的特性。陶瓷材料在实际使用过程中常常在应力较低时发生脆性断裂, 且断裂强度比理论强度要低几个数量级, 如 Al 2 O 3 陶瓷材料的理论强度约为 38 GPa [13] , 但实际获得的 Al 2 O 3 陶瓷材料的强度通常只有 0.4~0.5 GPa。Griffith 断裂理论 [14] 表明, 陶瓷材料发生脆性破坏(即断裂)的临界条件是在外界应力作用下, 材料内部能够储存的弹性应变能等于裂纹扩展需要克服的表面能, 如式(1)所示: [15][16][17] 。通过振荡热压致密化烧结 [18][19][20][21][22][23] (热压烧结、热压振荡烧结等) 等工艺途径能明显地改善强度。Han 等 [20] 对比了无压烧结(Pressureless sintering; PS)、热压烧结(Hot press sintering; HP)及压力振荡烧结(Oscillatory pressure sintering; OPS)三种不同烧结工艺对陶瓷强度的影响, 研究表明, 随着烧结工艺由 PS、HP 发展至 OPS, 氧化锆陶瓷的抗弯强度分别由(856±95)、(1303±131)增加至(1455±99) MPa。但是这种热压方式受到样品形状和尺寸的限制。此外, 细化晶粒(亚微米或纳米晶) 能提高陶瓷强度, 晶粒尺寸越小, 材料强度越高, 满足正 Hall-Petch 关系。但是, 当晶粒尺寸小到一定程度后, 会出现反 Hall-Petch 关系 [24] 。Hirata 等 [25] 研究了晶粒尺寸对 SiC 陶瓷微观结构及性能的影响, 其中 M 系列(25vol% 30 nm + 75vol% 800 nm)SiC 陶瓷强度明显高于 A 系列陶瓷(100vol% 800 nm), 而 N 系列陶瓷 (25vol% 30 nm + 75vol% 330 nm)由于晶粒太小, 强度反而有所下降(图 1)。…”

Section: 陶瓷增强技术unclassified

Development and Prospects of High Strength Pre-stressed Ceramics

Yi-wang¹,

Sun²,

Fenghua³

et al. 2019

Journal of Inorganic Materials

View full text Add to dashboard Cite

It is a worldwide challenge to simultaneously improve the strength and damage tolerance of ceramics, which is a core issue in the development of ceramics and a goal pursued by materials scientists. While the pre-stressed design has been widely used to improve the strength of concrete and glass for over a century, a little progress has been made for ceramic materials. In this paper, the research progresses of ceramic reinforcement are summarized, and a new pre-stressed design and model of high strength and high damage tolerance composite ceramics are proposed. The novel design focuses on the generation of residual compressive stresses on the surface of ceramic components to inhibit crack initiation and growth, and offset the external tensile stress, which can be applied to different fields such as structural ceramics, architectural ceramics, domestic ceramics and so on. This simple and economical technique with no limitation of size and shape in ceramic components has great application prospects.

show abstract

“…However, most of the research has not changed the problem of high porosity in traditional powder metallurgy [ 12 ]. The oscillatory sintering method recently proposed by Xie Zhipeng [ 13 , 14 ] can be used to solve the defects of traditional powder metallurgy for ceramic materials. Great progress has been made in the preparation of ceramic materials with high density, fine grains, high strength and high reliability.…”

Section: Introductionmentioning

confidence: 99%

Plasma Oscillatory Pressure Sintering of Mo-9Si-8B Alloy with ZrB2 Addition

Xiangyu

Guo

et al. 2022

Materials

View full text Add to dashboard Cite

Oscillatory pressure sintering is a novel crystal refinement technology. The doping of different concentrations of ZrB2 under oscillatory sintering technology (9 Hz) is discussed here, focusing on its macroscopic mechanics and oxidation resistance. In particular, doping 2.5 wt% ZrB2 can effectively increase the hardness of the alloy, slightly increase the fracture toughness of the alloy and have an outstanding effect on the oxidation resistance of the alloy at 1300 °C, achieving the effect of reducing mass loss by 80.3%.

show abstract

Improved mechanical properties of Al2O3-25 vol% SiCw composites prepared by oscillatory pressure sintering

Cited by 32 publications

References 15 publications

Preparation, mechanical properties, and toughening mechanisms of SiCw/SiCp‐reinforced zirconia‐toughened alumina ceramics

Preparation, mechanical properties, and toughening mechanisms of SiCw/SiCp‐reinforced zirconia‐toughened alumina ceramics

Development and Prospects of High Strength Pre-stressed Ceramics

Plasma Oscillatory Pressure Sintering of Mo-9Si-8B Alloy with ZrB2 Addition

Contact Info

Product

Resources

About