Super-Tough Silicon Nitride with R-Curve Behavior

Li, Chien-Wei; Yamanis, John

doi:10.1002/9780470310557.ch10

Cited by 199 publications

(60 citation statements)

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“…Most researchers agree that coarse microstructures with elongated grains induce increased fracture toughness, possibly due to enhanced crack deflection and crack bridging [68,69]. Li and Yamanis [70] reported that Si 3 N 4 ceramics containing large (≥ 1 µm diameter) elongated grains could exhibit fracture toughness up to 10 MPa m 1/2 . However, the fracture strength of such ceramics (800-900 MPa) is considerably lower than that of materials with fine-grained microstructures, which can achieve exceptionally high fracture strengths of 1000-1500 MPa with lower fracture toughness [71].…”

Section: Sintering Chemistry Of Additives In Bulk Nitride Ceramicsmentioning

confidence: 99%

Chemical research needed to improve high-temperature processing of advanced ceramic materials (Technical report)

Kolář

2000

Pure and Applied Chemistry

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Republication or reproduction of this report or its storage and/or dissemination by electronic means is permitted without the Chemical research needed to improve high-temperature processing of advanced ceramic materialsAbstract: Of the principal classes of engineering materials, ceramics are in many ways the most interesting and challenging. Many properties, or combination, of properties, not achievable with other classes of materials give ceramics enormous technical potential. The main obstacles that prevent the wider use of ceramics include insufficient reliability, reproducibility, and high cost. The physical basis of the processing steps is well established, however, the chemical reactions which occur during the high-temperature processing frequently influence the densification process and microstructure development of ceramics in an unpredictable way. Therefore, an ability to understand and control the chemical processes that occur during ceramic processing are necessary to advance and open up new uses for technical ceramics. The aim of this present report, resulting from discussions of an ad hoc group of ceramists and chemists, is to expose the areas of chemical research that can most benefit the processing, and further the use, of ceramic materials.

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Section: Sintering Chemistry Of Additives In Bulk Nitride Ceramicsmentioning

confidence: 99%

Chemical research needed to improve high-temperature processing of advanced ceramic materials (Technical report)

Kolář

2000

Pure and Applied Chemistry

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“…The issue of fracture toughness has been addressed using two different approaches, fiber-reinforcement of composites [Chiang et al, 1993;Evans, 1990] and the development of in-situ toughening based on microstructural design [Evans, 1990;Li and Yamanis, 1989;Khandelwal et al, 1995;Sajgalik et al, 1995]. In particular, the development of high-toughness silicon nitride has proven remarkably successful and it will be used as a reference point in this discussion as well as the baseline material in the proposed research project.…”

Section: Introductionmentioning

confidence: 99%

Solid Freeform Fabrication Proceedings

Bourell¹,

Beaman²

2001

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“…Synthesized in 1859, it was first manufactured into useful refractory shapes in the 1950s-60s, but was not extensively developed as an engineered ceramic until the 1980s [1][2][3][4]. Since then, it has garnered considerable attention because of its unique combination of excellent room-and high-temperature mechanical strength, toughness, oxidation, and thermal shock resistance [1,[5][6][7][8][9][10][11][12][13][14][15]. Si 3 N 4 is currently used in demanding mechanical applications involving high loads, wear, and corrosion [16].…”

Section: Introductionmentioning

confidence: 99%