Spark plasma sintering of Zr- and Hf-borides with decreasing amounts of MoSi2 as sintering aid

Sciti, Diletta; Silvestroni, L.; Nygren, Mats

doi:10.1016/j.jeurceramsoc.2007.09.043

Cited by 101 publications

(51 citation statements)

References 23 publications

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“…So, all important factors such as SiC, C f , MoSi 2 , HfB 2 and ZrC content, milling time of C f and SPS parameters such as temperature, time and pressure were chosen according to previous studious [2,[10][11][12][13][14][15][16][17][18]. Four levels were selected for each of them.…”

Section: Methodsmentioning

confidence: 99%

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Effect of HfB2 on microstructure and mechanical properties of ZrB2–SiC-based composites

Balak

Zakeri

2016

International Journal of Refractory Metals and Hard Materials

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Section: Methodsmentioning

confidence: 99%

“…Also it can be seen in some composites such as composite 4 that despite HfB 2 presence, light phase or approximately light phase cannot be seen. In order to investigate these microstructure differences, composites 4,7,8,9,17 and 22 were selected. So line analysis was applied.…”

Section: Effect Of Temperature On Hfb 2 Solutionmentioning

confidence: 99%

Effect of HfB2 on microstructure and mechanical properties of ZrB2–SiC-based composites

Balak

Zakeri

2016

International Journal of Refractory Metals and Hard Materials

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“…Basic investigations were conducted with regard to sub-stoichiometry or incorporation of oxygen for ZrC (meaning ZrC x O y with x < 1, y  1) powder processing and promotion of ZrC sintering by additives [4,5,9,[15][16][17]. These papers discuss specific effects of ZrC x O y composition in relation to sintering behavior.…”

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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“…MoSi 2 has a beneficial effect on the mechanical and oxidation properties of ZrB 2 -SiC ceramics and is an effective sintering aid for ZrB 2 -SiC UHTCs produced by hot pressing [15,37] and spark plasma sintering. [38] Zhang et al [37] found that additions of tungsten carbide improved the oxidation resistance of pressureless sintered ZrB 2 at 1873 K (1600°C) by forming a solid solution with the ZrB 2 , which allowed liquid phase sintering of the ZrO 2 formed during oxidation. This process resulted in a substantial decrease in oxide scale thickness in the WC-containing ceramic.…”

Section: Additivesmentioning

confidence: 99%