Sintering of TiB2-TiC-SiC Composite Materials by Combined SPS/SHS Method

Abstract

The work aimed to determine the influence of iron-nickel alloy on the SPS sintering process of the TiB2-TiC-SiC composite. Composite casts were prepared with and without the additive of iron-nickel alloy to lower the sintering temperature. Composites were obtained by different methods. Samples were sintered directly from compounds and by a combined method where synthesis and sintering were conducted at the same time during SPS. The structure and properties of the composites were studied and compared. The addition of iron-nickel alloy allows sintering composites at lower temperatures, in addition, it reduces the porosity of the composite as iron-nickel alloy grains are placed between the composite grains and fill the gaps between the matrix polycrystals. Attention to ceramic matrix composite of the TiB2-TiC-SiC type is since they are characterized by a high melting point, high toughness, and high corrosion resistance. Above mentioned matrix was obtained at the temperature-1550°C by the SPS method. The addition of the iron-nickel alloy lowered it to 1200°C.