Oxidation Behavior of &lt;i&gt;In Situ&lt;/i&gt; Synthesized TiB/Ti Composite in Air Environment

Qin, Yuliang; Lü, Weijie; Qin, Jining; Zhang, Di

doi:10.2320/matertrans.45.3241

Cited by 3 publications

(2 citation statements)

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“…Besides, a higher load carrying capacity of thermally oxidized composites was reported after a sliding test with 10 N of a load. Similarly, in [15], the development of a dense rutile dominated layer with a strong interfacial cohesion over Ti-8 vol.% TiB composites at 650 • C was demonstrated. The performance of the tribo-oxide layer was found to be greatly influenced by temperature, sliding velocity, and the load applied.…”

Section: Introductionmentioning

confidence: 74%

“…Relative Density (%) Hardness IFT (MPa⋅m 1/2 ) SPS 97.92 ± 0.03 291 ± 10 (HV30) - [15] Mixing + SPS 99.6% -9.35 [19] Mixing + SPS 99.4% 1324 ± 18 (HV30) 10.52 [24] Ball The Vickers' hardness of TiB is about 1800 HV and, therefore, the high hardness of the TiB rich composite in the current research is ascertained (Table 2). Apart from a high hardness, a good IFT value (8.2 MPa•m 1/2 ) is demonstrated due to the presence of metallic Ti in the composite.…”

Section: Processmentioning

confidence: 99%

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Hot Sliding Wear of 88 wt.% TiB–Ti Composite from SHS Produced Powders

et al. 2021

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Titanium alloys and composites are of great interest for a wide variety of industrial applications; however, most of them suffer from poor tribological performance, especially at elevated temperatures. In this study, spark plasma sintering was utilized to produce a fully dense and thermodynamically stable TiB–Ti composite with a high content of ceramic phase (88 wt.%) from self-propagating high temperature synthesized (SHS) powders of commercially available Ti and B. Microstructural examination, thermodynamic assessments, and XRD analysis revealed the in situ formation of titanium borides with a relatively broad grain size distribution and elongated shapes of different aspect ratio. The composite exhibits a considerable hardness of 1550 HV30 combined with a good indentation fracture toughness of 8.2 MPa·m1/2. Dry sliding wear tests were performed at room and elevated temperature (800 ℃) under 5 and 20 N sliding loads with the sliding speed of 0.1 m·s−1 and the sliding distance of 1000 m. A considerable decline in the coefficient of friction and wear rate was demonstrated at elevated temperature sliding. Apart from the protective nature of generated tribo-oxide layer, the development of lubricious boric acid on the surface of the composite was wholly responsible for this phenomenon. A high load bearing capacity of tribo-layer was demonstrated at 800 ℃ test.

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Section: Introductionmentioning

confidence: 74%

Section: Processmentioning

confidence: 99%