Field assisted sintering of nanocrystalline titanium nitride powder

Abstract

The effect of field assisted sintering (FAS) on the compaction of TiN ceramics is examined using a nanosized TiN powder. Microstructural evolution at different stages of FAS is evaluated using electron microscopy. Coarse spherical particles (1-5 μm) are found at 700°C. These particles apparently result from excessive heat release on interparticle contacts when an electrical current passes through agglomerates at certain stages. The specific surface area and pore size distribution in sintered samples are examined with static volumetric absorption. The compaction and microstructural evolution are discussed in terms of electric field effects.

Wettability of TiN by Liquid Iron and Steel

“…As seen in Fig. 7, the results in this work show a good agreement with those of Kolesnihenko et al 10) and Kawano et al 8) Moreover, the present values are a half of those of Kim et al…”

“…50 nm) Figure 4(a) shows a comparison of the relative density, ρ r , data for a TiN substrate obtained in the present work with data from previous research. [7][8][9][10] It can be seen that the relative density of the TiN substrate clearly increased with an increased holding temperature, regardless of the powder size. For nano-size powder sintered TiN substrates at temperatures over 1 473 K, all ρ r values (from 79.5% to 96.3%) correspond quite well with those of previous studies [7][8][9][10] (from 78% to 97%).…”

“…[7][8][9][10] It can be seen that the relative density of the TiN substrate clearly increased with an increased holding temperature, regardless of the powder size. For nano-size powder sintered TiN substrates at temperatures over 1 473 K, all ρ r values (from 79.5% to 96.3%) correspond quite well with those of previous studies [7][8][9][10] (from 78% to 97%). In addition, it is seen that a higher pressure (89.2 MPa, 100 MPa) also promotes the densification of substrates, compared to a lower pressure (50 MPa).…”

Production of Products of Various Shapes From Si3N4-Based Refractory Compounds by Spark Plasma Sintering

“…It was shown in [16] that, at 1350-1400°C, nanodispersed titanium nitride can form either a completely sintered material in similar heating conditions or large spherical particles in inappropriate heating conditions. In any case, the consolidation of nanodispersed titanium nitride completes at 1350-1400°C, and the resulting skeleton or large particles prevent the further shrinkage of the material.…”

Outside Mainstream Electronic Databases: Review of Studies Conducted in the USSR and Post-Soviet Countries on Electric Current-Assisted Consolidation of Powder Materials

“…The majority of studies performed until 2007 in this Institute and other research organizations were conducted using a facility developed and manufactured by a research team led by Raichenko in 1976 [ 5 ]. In the following years, ERAN 2/1 set-up was also used in Frantsevich Institute for Problems of Materials Science [ 58 , 59 , 60 , 61 , 62 , 63 ]. In 2008–2010, Gevorkyan and Gutsalenko in Kharkov published a series of articles on sintering of ceramic materials using a hot-pressing facility with direct current heating [ 64 , 65 , 66 , 67 , 68 ].…”