Production of titanium matrix composites reinforced with SiC particles

Abstract

Titanium alloys exhibit high specific strength and stiffness that fit structural applications demanding lightweight construction. Ceramic reinforcements can improve specific strength and stiffness, and also the wear resistance. Higher specific strength and Young's modulus is expected when reinforcing titanium by SiC particles compared to other reinforcements. The production of a SiC reinforced titanium alloy using conventional powder metallurgy methods (PM) yields porosity and silicides formation. PM processing methods are discussed in this work: equal channel angular pressing, Spark plasma sintering, sintering using an induction oven and hot extrusion. Consolidation time and temperature are considerably decreased avoiding the silicide formation, while consolidation loads were increased to obtain a denser Ti-SiC composite. Hot extruded samples show the best results, without any reaction zone and a density near to the theoretical one. Entnommen aus <a href="http://www.fiz-technik.de/db/b_tema.htm" target="_blank">TEMA</a

Effects of SiC Nanoparticles on the Properties of Titanium-Matrix Foams Processed by Powder Metallurgy

“…Moreover, comparing with the pure titanium foam (Figure 10), the titanium-matrix foams show higher compressive strength due to the higher strength of SiC particles and more relative density of the foams. Similar results on the mechanical properties of titanium foams reinforced by different ceramic particles have been reported in the literature [2,9,16,21]. Table 1 lists compressive strength, energy absorption and other properties of titanium-matrix foams.…”

“…The results indicate that the samples processed by this method have three phases: Ti, C and Si3Ti5. In fact, SiC nanoparticles have a reaction with titanium matrix during sintering and Si3Ti5 particles are the product of the reaction [9]. Dimensions of the particles are dependent on the SiC particles.…”

“…Nano particles such as SiC improve noticeably the strength of titanium foams, especially at high temperatures [9].…”

“…Ceramic reinforcement particles have been used in the studies of Choe et al [10] who worked on TiC, Lee et al [11] on TiN, Yoshida et al [12] on TiO 2 , Karbalaei Akbari et al [13] on TiB 2 , Liang et al [14] on Si 3 N 4 , and Poletti et al [9] on SiC. Eriksson et al [15] produced Ti-TiB 2 composites by spark plasma sintering and Godfrey et al [16] investigated microstructure and tensile properties of mechanically alloyed Ti-6A1-4V with boron oxide additions.…”

Ti-Y2O3 Composites with Nanocrystalline and Microcrystalline Matrix

“…[6][7][8][9] Numerous investigations have been carried out on the production of titanium alloys of nanometric structures and structures reinforced by introducing dispersive particles to improve the mechanical properties. [10][11][12][13][14][15][16][17] Nanocrystalline materials exhibit exceptionally advantageous properties, which are not reached by advanced materials of typical microstructures. Among such properties are the following: hardness, strength, abrasion resistance, tribological properties, creep resistance, plasticity, embrittlement temperature, corrosion resistance, antibacterial and sterile properties, diffusion, or thermal expansion.…”