Title: Microstructure and mechanical properties of hot pressed submicron TiB2 powders
Abstract: This paper studies the microstructure and mechanical properties of hot pressed submicron TiB2 powders obtained from a special carbon coated precursors method. With the hot press temperature increasing from 1500 °C to 1800 °C, the relative density increases and the sample maintains a single TiB2 phase. The powders are able to be sintered to a relative density of ~94.5% at the temperature of 1800 °C. For the first time, unique elongated platelike grain structure, which has only been observed from transient liquid phase or reaction sintered borides, also forms at the sintering temperature of 1800 °C. In addition, the sample sintered at 1800 °C has a fine microstructure (elongated grain of ~0.3–3 µm) and high mechanical properties (hardness of ~27.6 ± 2.3 GPa, flexural strength of ~560 ± 49 MPa, and fracture toughness of ~6.5 ± 0.2 MPa m−1/2). Correlations between mechanical properties and microstructure are further discussed.
Publication Year: 2018
Publication Date: 2018-02-20
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 21
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