Investigation of possibility to fabricate Si<sub>3</sub>N<sub>4</sub>-TiN ceramic nanocomposite powder by azide SHS method

Kondratieva, Lydmila A; Kerson, Irina; Illarionov, A Yu; Amosov, A. P.; Bichurov, G. V.

doi:10.1088/1757-899x/156/1/012032

Cited by 3 publications

(2 citation statements)

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“…For the reinforcement to play its role efficiently, some characteristics such as chemical compatibility and similar coefficients of thermal expansion should be considered [11]. Among the silicon nitride composites, the most important are Si 3 N 4 -SiC [12,13], Si 3 N -ZrB 2 , Si 3 N 4 -BN and Si 3 N 4 -TiN [14][15][16][17][18][19][20][21][22][23]. The Si 3 N 4 -TiN composite is used in structural and studied for biomedical applications due to its high mechanical strength, low density, and good electrical properties.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of dispersed TiN particles in the Si 3 N 4 matrix makes it possible to obtain materials with high fracture toughness and flexural strength, high hardness, high chemical and wear resistance and high melt temperature [14,15]. As the TiN second phase presents considerable electrical conductivity, a reduction occurs in the electrical resistivity of the material, allowing its machining by electric discharge [16][17][18][19][20][21][22]. In the present study, we investigated the effect of different contents of TiN in densification and microstructure of Si 3 N 4 -TiN composites also using Al 2 O 3 and Y 2 O 3 as sintering aids.…”

Section: Introductionmentioning

confidence: 99%

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Densification and microstructure of Si3N4-TiN ceramic composites

2019

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Silicon nitride is a ceramic material widely used in various structural applications at high temperatures owing to its excellent combination of mechanical and thermal properties. To increase the application of Si 3 N 4 , many researches have been developed to improve its fracture toughness and processing conditions. In this study, the sintering and microstructure of Si 3 N 4-TiN composites, containing Al 2 O 3 and Y 2 O 3 as sintering aids, were studied. Samples were obtained by the conventional method of mixing powders and sintered at 1750 ºC/1 h and 1815 ºC/1 h under nitrogen atmosphere. Density values of the samples were determined by the Archimedes method, reaching values between 96.9% and 98.0% of theoretical density, with a porosity of less than 0.5%. The sintered samples were analyzed by X-ray powder diffraction and scanning electron microscopy. The results showed the materials reached high fracture toughness, low hardness and a microstructure with TiN grains dispersed in a β-Si 3 N 4 matrix containing an amorphous intergranular phase.

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