Mechanical Properties and Microstructure of Nano-SiC–Al2O3 Composites Densified by Spark Plasma Sintering

Gao, Lian; Wang, H.Z; Jia, Hong; Miyamoto, Hiroyuki; Miyamoto, Katsuhiko; Nishikawa, Yoshito; Torre, S.D. De la

doi:10.1016/s0955-2219(98)00232-5

Cited by 138 publications

(56 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Consolidation of nanopowders to product dense bodies for further property characterization has been accomplished with several techniques including sintering, hot-pressing, and spark plasma (or pulsed electric current) sintering (SPS). [13][14][15][16][17][18] The major concern in all of these methods of consolidation is grain growth. In view of the nonequilibrium state of the nanomaterials and the fact that consolidation takes place at high temperatures and requires relatively long holding times, grain growth (Oswald ripening) is anticipated.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of dense nanometric MoSi₂ through mechanical and field activation

et al. 2001

View full text Add to dashboard Cite

The effect of mechanical and field activation on the synthesis of dense nanometric MoSi 2 was investigated. Powders of Mo and Si, milled separately or comilled in a planetary ball mill, were reacted in a spark plasma synthesis (SPS) apparatus under different electric current conditions. Milled powders reacted faster and required less current than unmilled powders. Mixtures of powders which were milled separately (to nanometric size) reacted in the SPS to produce micrometric ␣-MoSi 2 . Similar results were obtained for samples comilled to produce nanometric reactants which did not contain detectable amounts of the product phase. When products form during milling, they contain both the ␣ and ␤ modifications of MoSi 2 . The product after the SPS reaction was nanometric MoSi 2 with a crystallite size of 140 nm.

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis of dense nanometric MoSi₂ through mechanical and field activation

et al. 2001

View full text Add to dashboard Cite

show abstract

“…Nanocomposites can not only improve stiffness and strength, but also fracture toughness [232][233][234][235][236][237][238][239][240][241][242]. In general, the fracture toughness of nanocomposites increases as the volume fraction increases, and increases as the nanofiller size decreases.…”

Section: Fracture Toughnessmentioning

confidence: 99%

Characterizing and Modeling Mechanical Properties of Nanocomposites-Review and Evaluation

Hu¹,

Onyebueke²,

Abatan³

2010

JMMCE

122

112

View full text Add to dashboard Cite

show abstract

“…Several researchers have reported a moderate enhancement of fracture toughness with improved strength in nanocomposites, for instance, Niihara [1], Davidge et al [11], Carroll et al [14], Zhao et al [19], and Gao et al [20], in spite of the well-known trade-off relations between the strength and the fracture toughness of monolithic ceramics [8]. Several mechanical properties were also improved, such as hardness [14,20,21], wear resistance [1,5], thermal shock resistance [1], and creep resistance [1,5].…”

Section: Characteristics Of Nanocompositesmentioning

confidence: 99%

“…Several mechanical properties were also improved, such as hardness [14,20,21], wear resistance [1,5], thermal shock resistance [1], and creep resistance [1,5]. On the other hand, Niihara observed highly developed sub-grain boundaries or dislocation networks in annealed nanocomposites [1], and several researchers have observed embryonic dislocations in the matrix grains [22].…”

Section: Characteristics Of Nanocompositesmentioning

confidence: 99%

Nanocomposites—a new material design concept

Choi

Araki

2005

Science and Technology of Advanced Materials

188

View full text Add to dashboard Cite

Ceramic-based nanocomposites were reviewed, emphasizing the newly developed concept of material design for ceramics. First, characteristics of the nanocomposites observed by previous researchers were summarized as, significant or moderate improvement in strength, drastic change of the fracture mode from intergranular fracture of monolithic ceramics to transgranular fracture of nanocomposites, moderate enhancement of fracture toughness, improvement of other mechanical properties, and observations of dislocations. Second, several mechanisms proposed previously to explain these characteristics were reviewed. Third, our strengthening and toughening mechanisms of nanocomposites on the basis of dislocation activities were explained. In nanocomposites, the highly localized residual stresses in the matrix grains are generated by the mismatch of thermal expansion coefficients between the matrix and the dispersed particles, and the dislocations are yielded during the cooling process after sintering. These dislocations then release the tensile residual stresses intrinsically existing in the matrix grains of sintered ceramics and improve the strength of the materials. In addition, as these dislocations cannot move at room temperature the sessile dislocations in the matrix operate as nano-crack nuclei in a frontal process zone (FPZ) ahead of the crack tip when the tip of a propagating crack approaches this area. Therefore, the size of the FPZ is expanded and as a result the fracture toughness is improved. Finally, estimation of the critical FPZ size was explained in order to clarify its toughening mechanism in nanocomposites. q

show abstract

Mechanical Properties and Microstructure of Nano-SiC–Al2O3 Composites Densified by Spark Plasma Sintering

Cited by 138 publications

References 5 publications

Synthesis of dense nanometric MoSi₂ through mechanical and field activation

Synthesis of dense nanometric MoSi₂ through mechanical and field activation

Characterizing and Modeling Mechanical Properties of Nanocomposites-Review and Evaluation

Nanocomposites—a new material design concept

Contact Info

Product

Resources

About

Mechanical Properties and Microstructure of Nano-SiC–Al2O3 Composites Densified by Spark Plasma Sintering

Cited by 138 publications

References 5 publications

Synthesis of dense nanometric MoSi2 through mechanical and field activation

Synthesis of dense nanometric MoSi2 through mechanical and field activation

Characterizing and Modeling Mechanical Properties of Nanocomposites-Review and Evaluation

Nanocomposites—a new material design concept

Contact Info

Product

Resources

About

Synthesis of dense nanometric MoSi₂ through mechanical and field activation

Synthesis of dense nanometric MoSi₂ through mechanical and field activation