Characterisation and high temperature mechanical properties of zirconium boride-based materials

Meléndez, Juan J.; Domínguez‐Rodríguez, Arturo; Monteverde, Frédéric; Melandri, Cesare; Portu, Goffredo de

doi:10.1016/s0955-2219(02)00114-0

Cited by 174 publications

(96 citation statements)

References 11 publications

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“…Hot Pressing Hot pressing is the conventional method for fabricating UHTCs and has been used extensively, [8][9][10]12,16,17,20,22,27,33,35,39,47,48,[50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65] with typical temperatures of~2173 K (1900°C) and applied pressures between 30 and 50 MPa. It allows full densification without the use of sintering aids, although most research employs modest amounts of sintering aids such as silicides, borides, metals (e.g., Ni), or C to reduce processing times and temperatures, thus reducing the costs associated with the production technique.…”

Section: Densification Methodsmentioning

confidence: 99%

Toward Oxidation-Resistant ZrB2-SiC Ultra High Temperature Ceramics

Eakins

Jayaseelan

Lee

2010

Metall Mater Trans A

145

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Section: Densification Methodsmentioning

confidence: 99%

Toward Oxidation-Resistant ZrB2-SiC Ultra High Temperature Ceramics

Eakins

Jayaseelan

Lee

2010

Metall Mater Trans A

145

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“…Additionally, it is widely recognized that strain measurements are challenging above 1400˚C, and accurate strains are vital for understanding creep. However, with the exception of Winder [13] and Meléndez-Martínez et al [14], all of the references in Table 1 …”

Section: What Are the Creep Rates And Creep Mechanisms Associated Witmentioning

confidence: 99%

“…The pure ZrB 2 had lower creep rates, which were consistent with the authors' argument that the Ni-doped ZrB 2 resulted in a softer phase at the grain boundaries. The Ni-doped ZrB 2 exhibited a stress exponent of 1.5, but had to be determined at stress levels between 10 and 20 MPa due to catastrophic failures of the specimens at higher stresses [14]. The focus of the discussion is on the ideal composition for super-plasticity.…”

Section: ( 8 )mentioning

confidence: 99%

Creep and Oxidation of Hafnium Diboride Based Ultra High Temperature Ceramics at 1500C

DeGregoria¹

2015

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Ultra high temperature ceramics (UHTCs) are leading candidates for aerospace structural applications in high temperature environments, including the leading edges of hypersonic aircraft and thermal protection systems for atmospheric re-entry vehicles.Before UHTCs can be used in such applications, their structural integrity and environmental durability must be assured, which requires a thorough understanding and characterization of their creep and oxidation behavior at relevant service temperatures.Creep, or the progressive, time-dependent deformation of material under constant load, is a critical criterion in these applications, but not much is known with regard to UHTCs or whether there are interactions with oxidation processes. Thus, a facility for high temperature, mechanical testing in air was augmented for testing in argon. Then, the compressive creep of a popular UHTC, HfB 2 , was examined at 1500°C in argon and compared to results in air. HfB 2 specimens with 0, 10, 20, and 30% additions of SiC were tested, which enabled assessments of the effects of grain size and SiC content on creep behavior. Boundary mechanisms accommodated by diffusion through grains dominated the creep rates. The results also suggest that SiC formed a network of pointto-point contacts and increased creep resistance.A unique stressed oxidation test was devised in order to further investigate the interaction of creep and oxidation. The results indicate that up to 75 MPa of compressive stress, models of creep and oxidation in HfB 2 -based UHTCs can be decoupled.

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“…Based on these properties, ZrB 2 -based ceramics are attracting more and more attention in ultrahigh temperature applications where resistance to corrosion, wear and oxidation is demanded (Fahrenholtz and Hilmas, 2007;Zhu et al, 2009aZhu et al, , 2009b. They have been found to be suitable materials in various usage areas such as electrodes, thermowells, molten metal crucibles, armors, thermal protection systems for hypersonic flight, atmospheric re-entry vehicles, rocket propulsion and nose caps (Melendez-Martinez et al, 2002;Chamberlain et al, 2004;Monteverde et al, 2008;Brouchu et al, 2009). Furthermore, they have been used as wear parts, nozzles, coating on cutting tools and cathodes for electrochemical processing of aluminium (Upadhya et al, 1997;Opeka et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evaluation of ZrB<sub>2</sub>/ZrO<sub>2</sub> Ceramic Powders Prepared by Milling-Assisted Magnesiothermic Reduction of Oxide Raw Materials

Ağaoğulları

Balcı

Öveçoğlu

et al. 2017

KONA

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This study reports on the synthesis and microstructural evaluation of ZrB 2 /ZrO 2 ceramic powders prepared by milling-assisted magnesiothermic reduction of oxide raw materials. Powder blends containing ZrO 2 , B 2 O 3 and Mg reactants were milled in different type of mills at different durations and were subsequently annealed in a tube furnace under Ar atmosphere. An additional purification step (HCl leaching) was conducted on the milled and annealed samples to obtain only Zr-based products. FactSage TM thermochemical software was used in order toshow a preliminary route for the experiments. The effects of milling duration (up to 100 h), milling type (a SPEX TM 8000D Mixer/Mill and a planetary ball mill), excess Mg amount (5-20 wt.%) and annealing duration (6 and 12 h) on the formation and microstructure of the products were examined. The milled, annealed and leached products were characterized using an X-ray diffractometer (XRD), stereomicroscope (SM), scanning electron microscope (SEM) and differential scanning calorimeter (DSC). Pure ZrB 2 /ZrO 2 ceramic powders having particles in size range of 200 nm-1 μm and containing two different crystal structures of ZrO 2 phase (monoclinic and tetragonal) were obtained after milling in the SPEX TM 8000D Mixer/Mill for 30 h, annealing at 1200 °C for 12 h and leaching with 5 M HCl.

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Characterisation and high temperature mechanical properties of zirconium boride-based materials

Cited by 174 publications

References 11 publications

Toward Oxidation-Resistant ZrB2-SiC Ultra High Temperature Ceramics

Toward Oxidation-Resistant ZrB2-SiC Ultra High Temperature Ceramics

Creep and Oxidation of Hafnium Diboride Based Ultra High Temperature Ceramics at 1500C

Microstructural Evaluation of ZrB<sub>2</sub>/ZrO<sub>2</sub> Ceramic Powders Prepared by Milling-Assisted Magnesiothermic Reduction of Oxide Raw Materials

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