Effect of Spark Plasma Sintering on Densification and Mechanical Properties of Silicon Carbide

Tamari, Nobuyuki; Tanaka, Takahiro; Tanaka, Koji; Kondoh, Isao; Kawahara, Masakazu; Tokita, Masao

doi:10.2109/jcersj.103.740

Cited by 177 publications

(80 citation statements)

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“…Formation of Ti-aluminides phases is more prominent at 1173 and 1273 K. Since in all cases the reaction temperatures used are far below both the solidus line of Al 3 Ti (1623 K) and that of TiAl (1723 K), the observation described above indicates the uniqueness of the PCHP process with respect to the reaction behavior of constituent elements. It should be emphasized that the result obtained here indicates that plateshaped Ti-Al alloy can be fabricated directly from Ti and Al Table 2, the reaction zones in COMP24 are composed of Al 3 Ti (1, 8), Al-rich Ti solid solution (3,9), TiAl (4, 10) and Ti 3 Al (5, 11) layers when fabricated at 1173 K or 1273 K. In these layers, Al 3 Ti layers (1,8) are composed of many particles and interfaces between the particles were clearly seen at higher magnification micrographs, Figure 4(d, e). Although this suggests week bonding between the particles, bonding was slightly improved by increasing reaction temperature during PCHP.…”

Section: Microstructuresupporting

confidence: 51%

“…1 and Table 1, the reaction zones in COMP12 are composed of Al 3 Ti (1), Al-rich Ti solid solution (2), TiAl (3), and Ti 3 Al (4) layers when fabricated at 1173 K. When fabricated at 1273 K, on the other hand, reaction zones are composed of Al-rich Ti solid solution (7), TiAl (8) and Ti 3 Al (9) layers. It should be noted that no Al 3 Ti layer was formed when fabricated at 1273 K. In this case, however, Al-rich Ti solid solution and TiAl layers become larger in thickness and Ti layers also become larger in Al content, as compared with those obtained at 1173 K. When fabricated at 1373 K, on the other hand, instead of Tialuminides, a solid solution of Ti-21 at%Al alloy was formed.…”

Section: Microstructurementioning

confidence: 99%

“…Therefore, we proposed a new processing technique to produce a laminate-type Ti matrix composite containing Ti-aluminides. The process is involved in pulsed-current sintering (PCS), [6][7][8][9][10] combustion synthesis and vacuum hot pressing, and called a pulsed-current hot pressing (PCHP) process. [11][12][13] Through this process, laminate-type Ti matrix composites with Ti-aluminides can directly be fabricated from foils of Al and Ti.…”

Section: Introductionmentioning

confidence: 99%

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Properties of Ti-Aluminides-Reinforced Ti-Matrix Laminate Fabricated by Pulsed-Current Hot Pressing (PCHP)

et al. 2004

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Ti-aluminides-reinforced Ti-matrix composites were fabricated from 0.04 mm-thick Ti foils and 0.012 mm-and 0.024 mm-thick aluminum foils, in a process using a pulsed-current hot pressing (PCHP) equipment, and the effect of reaction temperature on properties of the composites was investigated. The composites were of laminated structure and composed of Ti and reacted layers containing Ti-aluminides. The composition of the reacted layers was dependent on the reaction temperature employed. Tensile testing at room temperature revealed that the reaction temperature was effective for the mechanical properties, including tensile strength, elongation and fracture mode, of the composites. The tensile strength and the elongation of composites fabricated at 1273 K from 0.04-mm-thick Ti and 0.012-mm-thick Al foils were 810 MPa and 3.64%, respectively, while they were 677 MPa and 3.44% for composites fabricated at 1173 K. Microstructure observations of fractured specimens showed that Ti layers of the composites fabricated at 1173 and 1273 K played a significant role in improving ductility by prohibiting the growth of numerous cracks emanating from Ti-aluminides.

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Section: Microstructuresupporting

confidence: 51%

Section: Microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Properties of Ti-Aluminides-Reinforced Ti-Matrix Laminate Fabricated by Pulsed-Current Hot Pressing (PCHP)

et al. 2004

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“…In order to obtain dense samples, the spark-plasma-sintering (SPS) method was used. SPS is a process in which materials are sintered using microscopic electrical discharge between particles under high sintering pressure [4][5][6]. SPS is usually used to produce dense metal and engineering ceramics, and only recently is being used to densify dielectric materials [7][8][9][10][11].…”

Section: Methodsmentioning

confidence: 99%

Enhanced piezoelectricity around the tetragonal/orthorhombic morphotropic phase boundary in (Na,K)NbO3–ATiO3 solid solutions

et al. 2007

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The high density perovskite titanates-modified potassium-sodium niobate solid solutions (1−x)(Na 0.5 K 0.5 ) NbO 3 −xBaTiO 3 and (1−x)(Na 0.5 K 0.5 )NbO 3 −xSrTiO 3 have been prepared by the solid state reaction method. The phase diagram summarized from the dielectric property measurement reveals that there exists a tetragonal/orthorhombic morphotropic phase boundary for both the solid solutions. The piezoelectric properties show enhanced behavior at around the tetragonal/orthorhombic morphotropic phase boundary. It is believed that the origin for the high piezoelectric performance (Na,K)NbO 3 -based lead-free piezoelectric ceramics is the same as that for the lead zinc niobate-lead titanate solid solution.

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“…7 Therefore, using these HAp materials fabricated by the spark plasma sintering, an improvement in the bone-like HAp crystal growth may be expected on their surfaces of HAp, because densification occurs at lower sintering temperatures compared with the conventional sintering process. In case of sintering oxides using the spark plasma sintering process, their intrinsic dielectric properties may have an important effect on the final properties, as has been theorized by Schneider et al 8 Although the electric properties of HAp with a low dielectric constant have also been investigated to understand its bioactive properties by many researchers, 9 there are still unsolved questions. It is therefore expected that the elucidation of the effect of electric poling on the bioactivity of HAp would contribute to the development of high-performance bioceramics.…”

Section: Introductionmentioning

confidence: 99%

Biocompatibility of dense hydroxyapatite prepared using an SPS process

Nakahira

Tamai

Aritani

et al. 2002

J. Biomed. Mater. Res.

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In the present study, the preparation of dense hydroxyapatite (HAp) materials at relative low temperatures using a spark plasma sintering was carried out. The bioactivity of HAp samples prepared by a spark plasma sintering method was investigated by in vitro tests and compared with HAp obtained by a conventional hot-pressing method. No growth of bone-like HAp crystals on surface of HAp sintered by a conventional hot-pressing method at 1200 degrees C was observed after immersion in a simulated body fluid (SBF) for 2 days. However, many large bone-like HAp crystals were observed on the surface of HAp samples prepared by a spark plasma sintering at 1200 degrees C after 2 days in the SBF immersion test. Especially, the negatively charged surface of the HAp samples prepared by spark plasma sintering was covered with larger HAp crystals compared with the positively charged surface. The electric poling of HAp was measured using a thermally simulated current technique. This rapid growth of bone-like HAp crystals of the HAp samples made by spark plasma sintering was believed to be related with the OH(-) and/or Ca(2(+) ) ion deficiency at the grain boundaries of the HAp matrix grains as well as a small electric poling effect resulting during the spark plasma sintering process.

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Effect of Spark Plasma Sintering on Densification and Mechanical Properties of Silicon Carbide

Cited by 177 publications

References 0 publications

Properties of Ti-Aluminides-Reinforced Ti-Matrix Laminate Fabricated by Pulsed-Current Hot Pressing (PCHP)

Properties of Ti-Aluminides-Reinforced Ti-Matrix Laminate Fabricated by Pulsed-Current Hot Pressing (PCHP)

Enhanced piezoelectricity around the tetragonal/orthorhombic morphotropic phase boundary in (Na,K)NbO3–ATiO3 solid solutions

Biocompatibility of dense hydroxyapatite prepared using an SPS process

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