Vacuum-thermal preparation of yttrium and gadolinium borides, and some of their properties

Manelis, R.M.; Meerson, G.A.; Zhuravlev, N.N.; Telyukova, T.M.; Stepanova, A. A.; Gramm, N.V.

doi:10.1007/bf00775505

Cited by 15 publications

(8 citation statements)

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“…Yttrium tetraboride (YB 4 ) possesses some unique properties, such as high melting point(2800°C), high hardness and strength, excellent chemical stability, and good electrical and magnetic properties, which makes it suitable for application in some extreme (ultra high temperature, nuclear, etc.) environments.…”

Section: Introductionmentioning

confidence: 99%

“…Yttrium tetraboride is not commercially available and the synthesis method of YB 4 has not been widely explored. Until now, only a few methods, such as solid‐state reaction method between the elements, borothermic reduction method, and aluminothermal method have been reported . In the solid‐state reaction method between the elements, the use of raw materials including the pure metal Y and B results in the high cost.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Pure YB₄ Powder via the Reaction of Y₂O₃ with B₄C

Peng

et al. 2012

J. Am. Ceram. Soc.

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Pure YB 4 powder was synthesized via the reaction of Y 2 O 3 with B 4 C under a vacuum pressure within the range of 20-50 Pa using spark plasma sintering (SPS) route. The effect of temperature and the molar ratio of the starting materials was studied. The role of the YBO 3 , an intermediate product, in the synthesis of YB 4 was investigated. For preparation of high purity YB 4 , the molar proportion of B 4 C to Y 2 O 3 should not be higher than the stoichiometric ratio (15/7). YBO 3 can be removed through decomposing to Y 2 O 3 and B 2 O 3 or reacting with B 4 C to form YB 4 and B 2 O 3 at a temperature above 1650°C. The little residual impurities, such as Y 2 O 3 and YBO 3 , can be removed by hydrochloric acid washing. Thus, a high purity YB 4 powder has been synthesized. The oxygen content of the obtained YB 4 is about 0.007% and the particle size is in the range of 3-10 lm.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of Pure YB₄ Powder via the Reaction of Y₂O₃ with B₄C

Peng

et al. 2012

J. Am. Ceram. Soc.

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“…The hardness of these tetragonal rare earth based HETBs are in the range of 13-15 GPa. There are only limited prior reports on the measured hardness of binary rare earth tetraborides; the hardness values of YB4 and GdB4 have been reported to be 27.94 and 18.63 GPa, respectively, without specifying the indentation load (presumably at a low load, given the high values) [50]. On the other hand, the hardness of most binary rare earth hexaborides are reported to be within the range of 22-28 GPa at much reduced indentation loads of 0.98 N or lower according to a recent review [37].…”

Section: Resultsmentioning

confidence: 99%

High-entropy rare earth tetraborides

Qin

Yan

Wang

et al. 2021

Journal of the European Ceramic Society

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“…Recently yttrium tetraboride (YB 4 ), a transition metal boride, has attracted attention owing to its high melting point (2800 • C), low density (4.36 g/cm 3 ), high hardness, high strength, excellent chemical stability and good electrical conductivity [5][6][7][8][9]. The unique combination of these properties makes YB 4 promising in ultrahigh temperature applications.…”

Section: Introductionmentioning

confidence: 99%