Solid state reaction of zirconia with carbon

Maı̂tre, Alexandre; Lefort, Pierre

doi:10.1016/s0167-2738(97)00398-6

Cited by 149 publications

(94 citation statements)

References 12 publications

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“…Subsequently, a part of C* reduced ZrO 2 to give more active Zr* by the carbothermal reduction reaction (Eq. (5)) [13,30,38] . Meanwhile, nano-sized ZrC powders started to grow in a short time (Eq.(6)).…”

Section: Reaction Mechanismsmentioning

confidence: 99%

Preparation of nano-sized zirconium carbide powders through a novel active dilution self-propagating high temperature synthesis method

Long

Wang

et al. 2015

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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High quality nano-sized zirconium carbide (ZrC) powders were successfully fabricated via a developed chemical active dilution self-propagating high-temperature synthesis (SHS) method assisted by ball milling pretreatment process using traditional cheap zirconium dioxide powder (ZrO 2 ), magnesium powder (Mg) and sucrose (C 12 H 22 O 11 ) as raw materials. FSEM, TEM, HRTEM, SAED, XRD, FTIR and Raman, ICP-AES, laser particle size analyzer, oxygen and nitrogen analyzer, carbon/sulfur determinator and TG-DSC were employed for the characterization of the morphology, structure, chemical composition and thermal stability of the as-synthesized ZrC samples. The as-synthesized samples demonstrated high purity, low oxygen content and evenly distributed ZrC nano-powders with an average particle size of 50nm. In addition, the effects of endothermic rate and the possible chemical reaction mechanism were also discussed.

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Section: Reaction Mechanismsmentioning

confidence: 99%

Preparation of nano-sized zirconium carbide powders through a novel active dilution self-propagating high temperature synthesis method

Long

Wang

et al. 2015

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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“…The reaction of ZrO 2 and C tends to produce ZrC x O y with 0 < x < 1, y > 0 and x + y ≤ 1 as long as the reaction is incomplete due to kinetic reasons. Oxygen atoms could easily occupy the carbon positions in the Zr-C lattice [13,18,19]. However, the thermodynamically stable situation will be a sub-stoichiometric ZrC x O y with x < 1, y = 0, which is hard to achieve.…”

Section: Introductionmentioning

confidence: 99%

Pressureless sintering of ZrC with variable stoichiometry

2017

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This paper presents the experiments on the synthesis of zirconium carbide (ZrC) using carbothermal reduction of zirconia (ZrO 2 ). The ratio of ZrO 2 :C is used to adapt ZrC x O y with x < 1 or ZrC + C. The modification of ZrC x O y and the total carbon amount allows the use of pressureless sintering method in combination with sintering temperatures ≤ 2000 ℃. Fully densified ZrC products are obtained. The relevant details of ZrC formation are investigated by X-ray diffraction (XRD). The sintered products are characterized by XRD, field emission scanning electron microscopy (FESEM), as well as mechanical and electrical methods. XRD and FESEM investigations show that ZrC x O y is formed during the manufacturing process. The grain size and additional zirconia or carbon are related to the ZrO 2 :C ratio of the starting powder mixture. Bending strength up to 300 MPa, Young's modulus up to 400 GPa, fracture toughness up to 4.1 MPa·m 1/2 , and electrical resistance at room temperature around 10 4 Ω·cm are reached by the pressureless sintered ZrC.

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“…The synthesis of the ZrC x O y powder has been performed via the carboreduction route. The detailed procedure of synthesis has been described in a previous paper [13]. In fact, this way of synthesis was developed to avoid the presence in the starting powders of impurities, e.g.…”

Section: Introductionmentioning

confidence: 99%