SiC matrix composites reinforced with internally synthesized TiB2

Tani, Toshihiko; Wada, Satoshi

doi:10.1007/bf00544201

Cited by 42 publications

(9 citation statements)

References 9 publications

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“…In general, crack deflection, crack bridging, and microcracking induced by the difference between coefficients of thermal expansion of TiB 2 and SiC, are found to be responsible in improving the fracture toughness of the composites. [23][24][25][26][27][28] Hu et al 29 studied the effect of AlN-Y 2 O 3 additive content (from 5 to 20 vol%) on electrical and mechanical properties, and found combination of superior properties in case of SiC-TiB 2 composites with 10 vol% additive. Furthermore, pressure-less sintering 23,24,26,27 and hot-pressing 25,28 routes were generally adopted for fabricating SiC-TiB 2 composites.…”

Section: Introductionmentioning

confidence: 99%

Development of spark plasma sintered conductive SiC–TiB₂ composites for electrical discharge machining applications

Chodisetti

Malik

Kumar

2021

Int J Applied Ceramic Tech

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Highly dense electrically conductive silicon carbide (SiC)–(0, 10, 20, and 30 vol%) titanium boride (TiB2) composites with 10 vol% of Y2O3–AlN additives were fabricated at a relatively low temperature of 1800°C by spark plasma sintering in nitrogen atmosphere. Phase analysis of sintered composites reveals suppressed β→α phase transformation due to low sintering temperature, nitride additives, and nitrogen sintering atmosphere. With increase in TiB2 content, hardness increased from 20.6 to 23.7 GPa and fracture toughness increased from 3.6 to 5.5 MPa m1/2. The electrical conductivity increased to a remarkable 2.72 × 103 (Ω cm)–1 for SiC–30 vol% TiB2 composites due to large amount of conductive reinforcement, additive composition, and sintering in nitrogen atmosphere. The successful electrical discharge machining illustrates potential of the sintered SiC–TiB2 composites toward extending the application regime of conventional SiC‐based ceramics.

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Section: Introductionmentioning

confidence: 99%

Development of spark plasma sintered conductive SiC–TiB₂ composites for electrical discharge machining applications

Chodisetti

Malik

Kumar

2021

Int J Applied Ceramic Tech

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“…Reaction sintering is an alternative method to fabricate TiB 2 -SiC ceramic composites, in which an in-situ reaction takes place and, TiB 2 and SiC grains are synthesized. Reaction systems such as TiH 2 -Si-B 4 C, TiH 2 -B-SiC-B 4 C, SiC-TiN-B and TiH 2 -BN-Si have been employed to fabricate TiB 2 -SiC ceramic composites [17][18][19]. However, gases such as H 2 or N 2 were released during these reactions, which would form pores and deteriorate mechanical properties of the composites.…”

Section: Introductionmentioning

confidence: 99%

Effects of Sintering Conditions on Microstructure and Mechanical Properties of Reactive Hot Pressed Tib₂-Sic Ceramic Composites

Zhao¹,

Huang²,

He³

et al. 2016

Ceramics - Silikaty

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Reactive hot pressing (RHP) offers many advantages over the conventional hot pressing process. In this work, TiB 2 -20 wt. % SiC ultra-high temperature ceramic composites were fabricated via RHP. The effects of sintering time (1600 -1700°C) and sintering temperature (30 -60 min), as well as the relationship between microstructure and mechanical properties, were investigated. For the investigated range of sintering conditions, the optimum comprehensive mechanical properties, i.e., flexural strength of 725 MPa, fracture toughness of 6.5 MPa•m ½ and hardness of 21.6 GPa, were achieved at 1700°C for 45 min. The good mechanical properties were attributed to small grain size and homogeneous microstructure. The sintering time and temperature had significant influences on the mechanical properties and microstructure of the composites. The flexural strength and hardness increased when the sintering time prolonged from 30 min to 45 min, subsequently decreased with further increasing of time. The fracture toughness had the opposite trend. With increasing of the sintering temperature, both flexural strength and hardness increased. The high porosity resulted from the low temperature was responsible for the poor mechanical properties. Moderate sintering time and a higher sintering temperature would lead to higher mechanical properties.

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“…The TiN added to the SiC matrix generally reacts with SiC and/or sintering additives during sintering and forms second phase(s). The following are suggested reactions in the SiC–TiN composites during sintering:

TiN + 2 B \to {TiB}_{2} + 1 / 2 {normalN}_{2} false↑

\begin{matrix} 4 TiN + 7 SiC + 4 {Al}_{2} {normalO}_{3} \to 4 TiC + 4 AlN \\ + 7 SiO false↑ + 2 {Al}_{2} O false↑ + 3 CO false↑ \end{matrix}

TiN + 2 SiC + 3 {normalY}_{2} {normalO}_{3} \to TiC + 2 SiO false↑ + 6 YO false↑ + CO false↑

4 TiN + 2 SiC \to 4 {TiC}_{0.5} {normalN}_{0.5} + 2 {Si}_{(liquid)} + {normalN}_{2} false↑

The B, Al 2 O 3 , and Y 2 O 3 in Reactions were added as sintering additives, and they reacted with TiN and SiC to yield TiB 2 , TiC, or AlN. SiC–TiN composites could be processed by reaction synthesis and the following reaction was suggested:

3 TiC + {Si}_{3} {normalN}_{4} \to 3 TiN + 3 SiC + 1 / 2 {normalN}_{2} false↑

…”

Section: Introductionmentioning

confidence: 99%

“…Previous works on SiC–TiN composites focused on their mechanical and electrical properties and processing methods. A small amount of TiN added into liquid‐phase sintered SiC ceramics enhanced densification and improved mechanical properties .…”

Section: Introductionmentioning

confidence: 99%

Thermal and Mechanical Properties of SiC–TiC_0.5N_0.5 Composites

et al. 2014

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SiC–TiC0.5N0.5 composites were fabricated from β‐SiC and TiN powders with 2 vol% equimolar Y2O3–Sc2O3 additives by conventional hot pressing. Thermal and mechanical properties of the SiC–TiC0.5N0.5 composites were investigated as a function of initial TiN content. Relative densities of ≥98.9% were achieved for all samples. The addition of a small amount of TiN increased thermal conductivity, flexural strength, and fracture toughness of SiC ceramics. However, further addition of TiN in excess of 10 and 20 vol% deteriorated both thermal conductivity and flexural strength of the composites, respectively. In contrast, the fracture toughness of the composites increased continuously from 4.2 to 6.2 MPa∙m1/2 with increasing initial TiN content from 0 to 35 vol%, due to crack deflection by TiC0.5N0.5. The maximum values of thermal conductivity and flexural strength were 224 W/m K for a 2 vol% TiC0.5N0.5 and 599 MPa for a 10 vol% TiC0.5N0.5 composite.

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SiC matrix composites reinforced with internally synthesized TiB2

Cited by 42 publications

References 9 publications

Development of spark plasma sintered conductive SiC–TiB₂ composites for electrical discharge machining applications

Development of spark plasma sintered conductive SiC–TiB₂ composites for electrical discharge machining applications

Effects of Sintering Conditions on Microstructure and Mechanical Properties of Reactive Hot Pressed Tib₂-Sic Ceramic Composites

Thermal and Mechanical Properties of SiC–TiC_0.5N_0.5 Composites

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SiC matrix composites reinforced with internally synthesized TiB2

Cited by 42 publications

References 9 publications

Development of spark plasma sintered conductive SiC–TiB2 composites for electrical discharge machining applications

Development of spark plasma sintered conductive SiC–TiB2 composites for electrical discharge machining applications

Effects of Sintering Conditions on Microstructure and Mechanical Properties of Reactive Hot Pressed Tib₂-Sic Ceramic Composites

Thermal and Mechanical Properties of SiC–TiC0.5N0.5 Composites

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Product

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Development of spark plasma sintered conductive SiC–TiB₂ composites for electrical discharge machining applications

Development of spark plasma sintered conductive SiC–TiB₂ composites for electrical discharge machining applications

Thermal and Mechanical Properties of SiC–TiC_0.5N_0.5 Composites