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Oliveira, Fabio Branco Vaz de; Riella, Humberto Gracher
Proceedings of the 39. Brazilian congress on ceramics. v. 21995
Proceedings of the 39. Brazilian congress on ceramics. v. 21995
AbstractAbstract
[en] In this paper a technique for the determination of free carbon in boron carbide was studied. This technique consists in the treatment of the carbide samples with hot sulfocromic mixture, to the free carbon oxidation. The released gases are then circulated in barium hydroxide solutions, whose concentrations are previously determined and by titration the remain quantity of hydroxide in solution is determined. From convenient calculations the amount of free carbon present initially in the samples is then obtained, and these results are here evaluated. (author)
Original Title
Determinacao de carbono livre em carbeto de boro, via umida
Primary Subject
Source
Associacao Brasileira de Ceramica, Sao Paulo, SP (Brazil); 1112 p; 1995; p. 918-922; 39. Brazilian congress on ceramics; 39. Congresso brasileiro de ceramica; Aguas de Lindoia, SP (Brazil); 10-13 Jun 1995; Available from the library of the Brazilian Nuclear Energy Commission, Rio de Janeiro; 16 refs., 1 tab.
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AbstractAbstract
No abstract available
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Journal Article
Journal
Journal of Nuclear Materials; v. 55(1); p. 116
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Melo, F.C.L. de
Associacao Brasileira de Ceramica, Sao Paulo, SP (Brazil)1990
Associacao Brasileira de Ceramica, Sao Paulo, SP (Brazil)1990
AbstractAbstract
[en] Published in summary form only
Original Title
Estudo de sinterizacao de carbeto de boro
Primary Subject
Source
1990; 1 p; 34. Brazilian Congress on Ceramics; Blumenau, SC (Brazil); 20-23 May 1990
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Miscellaneous
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ElBiyaali, A.; Bentaleb, M.; Chadli, H.; Boutahir, M.; Rahmani, A.H.; Fakrach, B.; Hermet, P.; Rahmani, A., E-mail: a.rahmani@fs-umi.ac.ma2016
AbstractAbstract
[en] The spectral moment's method combined with a force constant model is used to calculate the polarized infrared spectra in single-walled BC3 nanotubes. We discuss the evolution of these spectra as a function of the diameter, chirality and length of nanotubes. Our work provides benchmark theoretical data for the assignment of experimental infrared spectra.
Primary Subject
Source
S138694771630371X; Available from http://dx.doi.org/10.1016/j.physe.2016.06.017; Copyright (c) 2016 Elsevier B.V. All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Physica E. Low-Dimensional Systems and Nanostructures (Print); ISSN 1386-9477;
; v. 84; p. 548-554

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AbstractAbstract
[en] The invention relates to the manufacture of boron carbide powder. It is well known that boron carbide, formula B4C, has many industrial applications because of its hardness. It is thus used in powder form as an abrasive, especially for lapping and polishing hard metals and carbides, whereas in the pressed and sintered condition it is very suitable for manufacturing parts subjected to a high rate of wear, e.g., sanding nozzles, dies, or bearings. Other applications exist in the nuclear field, when the B 10 isotope, which is a neutron absorber, is present
[fr]
La presente invention a trait a la fabrication du carbure de bore pulverulent. On sait que le carbure de bore, de formule chimique B4C, trouve de nombreuses applications dans l'industrie du fait de sa tres grande durete: ainsi, sous forme de poudre, il est utilise principalement comme abrasif, notamment pour le rodage et le polissage des metaux et carbures durs, tandis que, a l'etat moule et fritte, il est tout-a-fait approprie a la production de pieces soumises a forte abrasion, telles que buses de sablage, filieres, coussinets, etc... Il trouve en outre des applications dans le domaine nucleaire quand il renferme l'isotope 10B, en tant qu'absorbeur de neutronsOriginal Title
Procede de fabrication du carbure de bore
Primary Subject
Source
9 May 1980; 10 p; FR PATENT DOCUMENT 2438624/A/; Available from Institut National de la Propriete Industrielle, Paris (France)
Record Type
Patent
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Castro, A.R.M. de; Lima, N.B. de; Paschoal, J.O.A.
Associacao Brasileira de Ceramica, Sao Paulo, SP (Brazil)1990
Associacao Brasileira de Ceramica, Sao Paulo, SP (Brazil)1990
AbstractAbstract
[en] Published in summary form only
Original Title
Determinacao de carbono livre em pos ceramicos de carbeto de boro
Primary Subject
Secondary Subject
Source
1990; 2 p; 34. Brazilian Congress on Ceramics; Blumenau, SC (Brazil); 20-23 May 1990
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Miscellaneous
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AbstractAbstract
[en] Plate-impact experiments were performed on boron carbide specimens, having different porosities, in order to measure their Hugoniot elastic limit (HEL) values. The measurements were performed with commercial manganin gauges embedded at the back surface of the specimen and backed by a thick Plexiglas disk. The measured values show an almost linear decrease in the HEL values between 194 kbar (For the fully dense material) to 96 kbar for a specimen with 16.3% porosity. These values were compared with a theoretical model [suggested by D. Steinberg (LLL report LLL-UCID-16946, 1975)] which accounts for the dependence of the HEL on porosity, and the agreement is shown to be good
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Journal Article
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Reynolds, C.D. Jr.; Ardary, Z.L.
Oak Ridge Y-12 Plant, TN (USA)1979
Oak Ridge Y-12 Plant, TN (USA)1979
AbstractAbstract
[en] A method has been developed for fabricating long, cylindrical rubber-mill rolls of boron carbide for use with abrasive materials. The technique consisted of initially hot pressing the boron carbide (to 90% of the theoretical density) to short, hollow cylinders having a length-to-diameter ratio of about one. This initial hot-press operation was followed by a second hot press to join or bond, and further densify, the short sections into a final compact having a length-to-diameter ratio of three. Flexural-strength data show that the integrity of the bond is comparable to that of the base material
Primary Subject
Source
Apr 1979; 17 p; Available from NTIS., PC A02/MF A01
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Report
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AbstractAbstract
[en] Hot-pressing techniques have been developed to economically fabricate artefacts of such widely different materials as boron carbide, europium hexaboride, europia and zirconia, over a wide range of temperature, using HF heating. Using specially-designed multibore graphite dies, and a method whereby several specimens were pressed simultaneously in each bore, 48 specimens could be fabricated in a single operation. Experience gained resulted in the design and operation of a continuous hot-pressing facility, which consists essentially of a vertical column of interlocking dies, so arranged that each die acts as either a top or bottom punch in addition to its normal function as a die. The column as a whole moves downwards in a series of intermittent pulses, and is enclosed in silica shielding which allows only a small ingress of air. The use of multi-bore dies and expendable bore liners increased the efficiency of the system and replacement of the self-generated carbon monoxide atmosphere by a non-explosive argon/hydrogen mixture extended the lifespan of the graphite components. Silicon carbide dies are currently being tested with materials, particularly oxides, that show reaction with graphite. (author)
Primary Subject
Source
Special ceramics 7. A meeting of the Basic Science Section; London, UK; 15 - 18 Dec 1980
Record Type
Journal Article
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Conference
Journal
Proceedings of the British Ceramic Society; ISSN 0524-5141;
; (no.31); p. 249-258

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Melo, Francisco Cristovao Lourenco de; Silva, Cosme Roberto Moreira da
Proceedings of the 39. Brazilian congress on ceramics. v. 21995
Proceedings of the 39. Brazilian congress on ceramics. v. 21995
AbstractAbstract
[en] The special physical characteristics of boron carbide (B4 C) allow its use in a wide range of application in engineering design. Despite of this, the densification during sintering step became the main drawback of the development of ceramics components. The present work deals with the role of sintering aids on the densification of boron carbide ceramics produced through pressureless and hot-pressing sintering. The applied sintering aids were, C+B2 O3+ Al2 O3, Ni and/or Ti. Dilatometry was used to assist hot-pressing and, C+B2 O3 + Al2 O3 were the sintering aids. In the both cases the sintering temperature was lowered to 2200 K and 2073 K, pressureless and hot pressing respectively. The results of hardness of about 35 GPa and densification of 99% theoretical density for hot-pressed material show the effectiveness of these sintering aids. So far as the obtained data from this work is concerned we may believe that is possible to produce boron carbide ceramics components with both high density and hardness with lower cost by lowering sintering temperatures, that is, 200 K for pressureless sintering and 350 K for hot-pressing. (author)
Original Title
Efeito de aditivos na sinterizacao de carbeto de boro
Primary Subject
Source
Associacao Brasileira de Ceramica, Sao Paulo, SP (Brazil); 1112 p; 1995; p. 606-610; 39. Brazilian congress on ceramics; 39. Congresso brasileiro de ceramica; Aguas de Lindoia, SP (Brazil); 10-13 Jun 1995; Available from the library of the Brazilian Nuclear Energy Commission, Rio de Janeiro; 13 refs., 1 fig., 5 tabs.
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