Dynamic fatigue behavior of Si3N4-based ceramic tool materials at ambient and high temperatures

Xu, Weiwei; Yuan, Jun; Yin, Zengbin

doi:10.1016/j.ceramint.2019.07.152

Cited by 12 publications

(2 citation statements)

References 30 publications

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“…Si 3 N 4 -based ceramic composites have the characteristics of high strength, good fatigue toughness, wear-resistance and oxidation resistance, low dielectric constant, and excellent mechanical and mechanical properties. They are favored by researchers in aerospace, machinery, and other fields [38][39][40][41][42][43][44][45].…”

Section: Preparation Of Si3n4 Matrix Composites By In Situ Synthesismentioning

confidence: 99%

Study on the preparation method of in-situ synthesized whisker toughened ceramic materials

Qiao

Liu²,

Zhang³

et al. 2022

International Conference on Advanced Sensing and Smart Manufacturing (ASSM 2022)

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The advantages and disadvantages of different in-situ whisker synthesis processes are analyzed. The latest research progress on the in-situ synthesis of whisker toughening Al 2 O 3 -based and Si 3 N 4 -based ceramic tool materials are reviewed, and corresponding solutions to the problems existing in in-situ synthesis are proposed. It is believed that different in-situ synthesis processes have their own characteristics, and reasonable control of process conditions can obtain high-quality whiskers, thereby improving the comprehensive mechanical properties of ceramic tool materials.

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Section: Preparation Of Si3n4 Matrix Composites By In Situ Synthesismentioning

confidence: 99%

Study on the preparation method of in-situ synthesized whisker toughened ceramic materials

Qiao

Liu²,

Zhang³

et al. 2022

International Conference on Advanced Sensing and Smart Manufacturing (ASSM 2022)

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“…The fracture toughness of Si 3 N 4 ceramics without whiskers, and with no additional secondary phase, is low (4.0-4.8 MPa m 0.5 ) 10) . The presence of a secondary phase, such as that formed by incorporating transitionmetal carbides, improves mechanical properties [14][15][16][17][18] . Adding transitionmetal carbides to Si 3 N 4 ceramics also enhances fracture toughness.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Mechanical Properties of Silicon Nitride–Tungsten Carbide Composite Ceramics

Nino

Sekine

Sugiyama³

2022

J. Jpn. Soc. Powder Powder Metallurgy

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Si 3 N 4 -WC composite ceramics were sintered with Al 2 O 3 -Y 2 O 3 or AlN-Y 2 O 3 at 1500°C and 1600°C in a resistance-heated hot-pressing machine. These composite ceramics were densified, except for the Si 3 N 4 -60 mol% WC case containing Al 2 O 3 -Y 2 O 3 . The added WC did not decompose during sintering, and no WC-derived reaction products were formed. The α-Si 3 N 4 did not transform to β-SiAlON in the ceramics sintered with Al 2 O 3 -Y 2 O 3 at 1500°C or AlN-Y 2 O 3 at 1600°C, which resulted in a higher α-phase ratio in the sintered bodies. The addition of WC to Si 3 N 4 ceramics sintered with Al 2 O 3 -Y 2 O 3 at 1600°C inhibited the phase transformation from α-Si 3 N 4 to β-SiAlON. The Young's modulus for the ceramics increased with increasing WC up to 512 GPa. The Vickers hardness of the ceramics sintered with Al 2 O 3 -Y 2 O 3 increased by increasing WC from 14.4 to 19.3 GPa. When AlN-Y 2 O 3 was used as the sintering aid, the hardness increased with increasing WC, reaching a maximum of 21 GPa at 70 mol%. The Si 3 N 4 -70-80 mol% WC composite ceramics sintered with AlN-Y 2 O 3 exhibited a high fracture toughness of 8.9 MPa m 0.5 . The addition of WC to Si 3 N 4 ceramics improved both hardness and fracture toughness.

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Fatigue Fracture

Pelleg

2021

Structural Integrity

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Fatigue fracture is one of the primary damage mechanisms of structural components. Prior to final failure cracks or microcracks are induced. The fatigue cracking results from cyclic stresses that are below the ultimate tensile stress, or even the yield stress of the material. Surface flaws small are serving as stress risers where cracks can initiate, leading to fracture under repeated stresses. Porosity is detrimental to fatigue resistance and addition of small amounts a metal such as Ni for example, can improve the fatigue resistance by increasing the density. Fracture process can be divided into three stages crack formation, propagation and rapid fracture stage. Alumina, magnesia, zirconia, SiC and Si 3 N 4 subjected to fatigue fracture are presented and the effects promoting or resisting their progress are considered.

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Dynamic fatigue behavior of Si3N4-based ceramic tool materials at ambient and high temperatures

Cited by 12 publications

References 30 publications

Study on the preparation method of in-situ synthesized whisker toughened ceramic materials

Study on the preparation method of in-situ synthesized whisker toughened ceramic materials

Synthesis and Mechanical Properties of Silicon Nitride–Tungsten Carbide Composite Ceramics

Fatigue Fracture

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