In Situ Reinforcement of Ti6Al4V Matrix Composites by Polymer‐Derived‐Ceramics Phases

Abstract

Ti6Al4V-based metal matrix composites (MMCs) are successfully synthesized via a novel process route. Ti6Al4V powder is premixed with a solid preceramic polymer used as precursor for the in situ formation of a ceramic phase dispersed at the micrometer range. Ball-milling is used to intimately mix the powders. After the pyrolysis and sintering step, a Ti 5 Si 3 and TiC dispersion within the Ti6Al4V equiaxed grains matrix is formed. The effect of the volume fraction of the polymer-derived ceramic phase in the Ti6Al4V matrix is investigated in terms of Vickers hardness and wear resistance. The introduction of 10 vol% of ceramic reinforcement produces a homogeneous structure and results in a compact material with improved integrity and enhanced mechanical properties compared to standard cast alloy or Ti6Al4V-based composites reported in the literature.

Advances in the Synthesis of Preceramic Polymers for the Formation of Silicon-Based and Ultrahigh-Temperature Non-Oxide Ceramics

“…Metallic Ti, Zr, or Hf, as well as their oxides, can be added to an organic polymer to serve as a preceramic source of MC. − Through carbothermal reactions, oxygen and some excess carbon are removed from the system, yielding MC, although almost universally the product will still contain excess carbon. The polymer precursors can contain heteroatoms, such as Si or B, to produce ternary or quaternary ceramics of interest, such as MSiC or MSiCB. ,,, Additionally, other powdered metal sources can act as the source of metal in the final ceramic. For example, Devasia and co-workers reacted TiSi 2 with a polyborosiloxane (that possessed methyl and vinyl substitution on Si) to produce TiC/TiB/SiC (Figure ).…”

“…The polymer precursors can contain heteroatoms, such as Si or B, to produce ternary or quaternary ceramics of interest, such as MSiC or MSiCB. 285,287,289,290 Additionally, other powdered metal sources can act as the source of metal in the final ceramic. For example, Devasia and coworkers reacted TiSi 2 with a polyborosiloxane (that possessed methyl and vinyl substitution on Si) to produce TiC/TiB/SiC (Figure 33).…”

High Strength and High Wear‐Resistant Ti Composites Fabricated by Powder Metallurgy Pressureless Sintering

“…[ 15,16 ] For instance, Fabrizi et al. [ 17 ] reported a Ti‐6Al‐4V composite reinforced with in situ TiC and Ti 5 Si 3 particles derived from methylsilsesquioxane. At lower content of 9 vol%, the TMCs possessed uniform microstructure with homogeneously distributed reinforcements formed by the in situ reaction of matrix and residual of preceramic polymer.…”

“…[14] In recent years, a novel technique using the preceramic polymers to prepare in situ polymer-derived particles reinforced TMCs by powder metallurgy has attracted extensive interest. [15,16] For instance, Fabrizi et al [17] reported a Ti-6Al-4V composite reinforced with in situ TiC and Ti 5 Si 3 particles derived from methylsilsesquioxane. At lower content of 9 vol%, the TMCs possessed uniform microstructure with homogeneously distributed reinforcements formed by the in situ reaction of matrix and residual of preceramic polymer.…”