Fracture toughness of advanced ceramics at room temperature

Quinn, George D.; Salem, Jonathan A.; Bar‐On, Isa; Cho, Kyu; Foley, Michael R.; Fang, Ho T.

doi:10.6028/jres.097.026

Cited by 94 publications

(42 citation statements)

References 31 publications

(45 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Unfortunately, we could hardly overcome (and not always) technical problems associated with measurements on fracture surfaces which also took place in. 21 The data of Table 5 are also interesting because they, for instance, explain the dierence in the shape of R-curves 23 plotted by methods (i) and (ii) and generally point to the signi®cance of such curves obtained by the method (i) on¯exure.…”

Section: Data Inmentioning

confidence: 99%

See 1 more Smart Citation

Mechanical behaviour of yttria- and ferric oxide-doped zirconia at different temperatures

Gogotsi

1998

Ceramics International

View full text Add to dashboard Cite

The variation of strengh, deformability, fracture toughness and other characteristics of partially stabilized zirconia ceramics (Y±Fe±PSZ) doped with 3% yttrium and 3% ferric oxide over a temperature range from À140 to 1400 C were investigated. Fracture toughness (K 1c ) values obtained by the methods such as SENB, SEPB, IS and IF were compared. Lower temperatures resulted in an increase in fracture toughness by approximately 29%. Using the Vickers indents as stress concentrators for the IS tests we derived the relationship between K 1c values and mean values of radial crack length described by a second-degree polynomial. The data for zirconia (Y±PSZ and Mg±PSZ) and silicon-nitride ceramics, as well as the fractographic data, were used to analyse the results. It was established that the addition of ferric oxide exerted a positive eect on the strengh and fracture toughness of zirconia ceramics. # 1998 Elsevier Science Limited and Techna S.r.l.

show abstract

Section: Data Inmentioning

confidence: 99%

“…Therefore, there are no grounds to consider (see in Ref. 21 for observations of dierent authors on this problem) that such heterogeneous ceramics as Y±Fe±PSZ should display an increase of 2.52 times, as it was shown in Ref. 16 and con®rmed in Ref.…”

Section: Data Inmentioning

confidence: 99%

Mechanical behaviour of yttria- and ferric oxide-doped zirconia at different temperatures

Gogotsi

1998

Ceramics International

View full text Add to dashboard Cite

show abstract

“…[14][15][16] A shallow 0.1 mm deep notch was cut into the width dimension, near the middle of the beam. A sharp precrack was "popped" into the beam at room temperature via the bridge-indentation method (B-I).…”

Section: (2) Specimen Fabrication and Testingmentioning

confidence: 99%

Mode I Fracture Toughness of a Small‐Grained Silicon Nitride: Orientation, Temperature, and Crack Length Effects

Trice

Halloran

1999

Journal of the American Ceramic Society

View full text Add to dashboard Cite

The Mode I fracture toughness (K IC ) of a small-grained Si 3 N 4 was determined as a function of hot-pressing orientation, temperature, testing atmosphere, and crack length using the single-edge precracked beam method. The diameter of the Si 3 N 4 grains was <0.4 µm, with aspect ratios of 2-8. K IC at 25°C was 6.6 ± 0.2 and 5.9 ± 0.1 MPaؒm 1/2 for the T-S and T-L orientations, respectively. This difference was attributed to the amount of elongated grains in the plane of crack growth. For both orientations, a continual decrease in K IC was observed through 1200°C, to ∼4.1 MPaؒm 1/2 , before increasing rapidly to 7.5-8 MPaؒm 1/2 at 1300°C. The decrease in K IC through 1200°C was a result of grain-boundary glassy phase softening. At 1300°C, reorientation of elongated grains in the direction of the applied load was suggested to explain the large increase in K IC . Crack healing was observed in specimens annealed in air. No R-curve behavior was observed for crack lengths as short as 300 µm at either 25°or 1000°C.

show abstract

“…The indentation method does not require special equipment and makes it possible to obtain maximum data on the material upon testing a comparatively small amount of it. Despite some disadvantages [8], the method is becoming more and more popular. For example, it has been included in the industrial standard of Japan OlS 1607) that regulates the procedure for determining the crack resistance characteristics of ceramics, and in analogous ASTM and ISO tentative standards.…”

Section: Introductionmentioning

confidence: 99%