PROCEDE DE PREPARATION DE POLYCRISTAUX DE NITRURE DE BORE CUBIQUE ET POLYCRISTAUX DE NITRURE DE BORE AINSI OBTENUS
L'INVENTION CONCERNE LA FABRICATION DE MATERIAUX EXTRA-DURS PAR APPLICATION A CEUX-CI DE PRESSIONS ET DE TEMPERATURES ELEVEES.LE PROCEDE FAISANT L'OBJET DE L'INVENTION EST CARACTERISE EN CE QU'ON FAIT AGIR SUR LE NITRURE DE BORE HEXAGONAL UNE PRESSION DE 40 A 70.10 KPA ET UNE TEM...
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| creator | G. M. ZHDANOVICH, A. I. DUDYAK, M. I. GALKOV, V. P. BARABAN, J. V. ZHEREBTSOV, A. P. ZHOLOB ET M. M. ZHUK |
| description | L'INVENTION CONCERNE LA FABRICATION DE MATERIAUX EXTRA-DURS PAR APPLICATION A CEUX-CI DE PRESSIONS ET DE TEMPERATURES ELEVEES.LE PROCEDE FAISANT L'OBJET DE L'INVENTION EST CARACTERISE EN CE QU'ON FAIT AGIR SUR LE NITRURE DE BORE HEXAGONAL UNE PRESSION DE 40 A 70.10 KPA ET UNE TEMPERATURE DE 1200 A 1800C, QU'ON CESSE LE CHAUFFAGE APRES QUE LE TAUX DE CONVERSION DU NITRURE DE BORE HEXAGONAL EN NITRURE DE BORE CUBIQUE AIT ATTEINT UNE VALEUR COMPRISE ENTRE 20 ET 65 EN POIDS, ET QU'ON PORTE LA PRESSION JUSQU'A UNE VALEUR DE 80 A 120.10 KPA, APRES QUOI ON RETABLIT LE CHAUFFAGE ET ON PORTE LA TEMPERATURE JUSQU'A UNE VALEUR DE 1800 A 3000C, PUIS ON MAINTIENT CE REGIME DE TRAITEMENT PENDANT UN INTERVALLE DE TEMPS SUFFISANT POUR LA CONVERSION TOTALE DE NITRURE DE BORE HEXAGONAL EN NITRURE DE BORE CUBIQUE.LES POLYCRISTAUX OBTENUS PEUVENT ETRE UTILISES PAR EXEMPLE POUR LE PASTILLAGE D'OUTILS DE COUPE, DE COURONNES DE FORAGE, DE FRAISES ET D'AUTRES OUTILS.
A process for producing polycrystals of cubic boron nitride which comprises exposure of hexagonal boron nitride to a pressure of from 40 to 70 kbar at a temperature of from 1,200 DEG to 1,800 DEG C. When the conversion of hexagonal boron nitride to cubic boron nitride reaches 20 to 65% by weight, the heating is switched off and pressure is increased to a value of from 80 to 120 kbar. Then the heating is resumed and temperature is elevated to 1,800 DEG -3,000 DEG C. Under these conditions the process is continued to full conversion of hexagonal boron nitride to cubic modification thereof. The process can be conducted in the presence of 0.5 to 10% by weight of a catalyst contributing to the conversion of hexagonal boron nitride into its cubic modification. The main portion of the catalyst is concentrated in the central portion of the volume of hexagonal boron nitride, the remainder - in the peripheral portion. The present invention is useful in the manufacture of super-hard materials which, in turn, can be used in the industry of cutting tools. |
| format | Patent |
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A process for producing polycrystals of cubic boron nitride which comprises exposure of hexagonal boron nitride to a pressure of from 40 to 70 kbar at a temperature of from 1,200 DEG to 1,800 DEG C. When the conversion of hexagonal boron nitride to cubic boron nitride reaches 20 to 65% by weight, the heating is switched off and pressure is increased to a value of from 80 to 120 kbar. Then the heating is resumed and temperature is elevated to 1,800 DEG -3,000 DEG C. Under these conditions the process is continued to full conversion of hexagonal boron nitride to cubic modification thereof. The process can be conducted in the presence of 0.5 to 10% by weight of a catalyst contributing to the conversion of hexagonal boron nitride into its cubic modification. The main portion of the catalyst is concentrated in the central portion of the volume of hexagonal boron nitride, the remainder - in the peripheral portion. The present invention is useful in the manufacture of super-hard materials which, in turn, can be used in the industry of cutting tools.</description><language>fre</language><subject>ARTIFICIAL STONE ; CEMENTS ; CERAMICS ; CHEMISTRY ; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS ; CONCRETE ; LIME, MAGNESIA ; METALLURGY ; REFRACTORIES ; SLAG ; TREATMENT OF NATURAL STONE</subject><creationdate>1983</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19831110&DB=EPODOC&CC=FR&NR=2526413A1$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76290</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19831110&DB=EPODOC&CC=FR&NR=2526413A1$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>G. M. ZHDANOVICH, A. I. DUDYAK, M. I. GALKOV, V. P. BARABAN, J. V. ZHEREBTSOV, A. P. ZHOLOB ET M. M. ZHUK</creatorcontrib><title>PROCEDE DE PREPARATION DE POLYCRISTAUX DE NITRURE DE BORE CUBIQUE ET POLYCRISTAUX DE NITRURE DE BORE AINSI OBTENUS</title><description>L'INVENTION CONCERNE LA FABRICATION DE MATERIAUX EXTRA-DURS PAR APPLICATION A CEUX-CI DE PRESSIONS ET DE TEMPERATURES ELEVEES.LE PROCEDE FAISANT L'OBJET DE L'INVENTION EST CARACTERISE EN CE QU'ON FAIT AGIR SUR LE NITRURE DE BORE HEXAGONAL UNE PRESSION DE 40 A 70.10 KPA ET UNE TEMPERATURE DE 1200 A 1800C, QU'ON CESSE LE CHAUFFAGE APRES QUE LE TAUX DE CONVERSION DU NITRURE DE BORE HEXAGONAL EN NITRURE DE BORE CUBIQUE AIT ATTEINT UNE VALEUR COMPRISE ENTRE 20 ET 65 EN POIDS, ET QU'ON PORTE LA PRESSION JUSQU'A UNE VALEUR DE 80 A 120.10 KPA, APRES QUOI ON RETABLIT LE CHAUFFAGE ET ON PORTE LA TEMPERATURE JUSQU'A UNE VALEUR DE 1800 A 3000C, PUIS ON MAINTIENT CE REGIME DE TRAITEMENT PENDANT UN INTERVALLE DE TEMPS SUFFISANT POUR LA CONVERSION TOTALE DE NITRURE DE BORE HEXAGONAL EN NITRURE DE BORE CUBIQUE.LES POLYCRISTAUX OBTENUS PEUVENT ETRE UTILISES PAR EXEMPLE POUR LE PASTILLAGE D'OUTILS DE COUPE, DE COURONNES DE FORAGE, DE FRAISES ET D'AUTRES OUTILS.
A process for producing polycrystals of cubic boron nitride which comprises exposure of hexagonal boron nitride to a pressure of from 40 to 70 kbar at a temperature of from 1,200 DEG to 1,800 DEG C. When the conversion of hexagonal boron nitride to cubic boron nitride reaches 20 to 65% by weight, the heating is switched off and pressure is increased to a value of from 80 to 120 kbar. Then the heating is resumed and temperature is elevated to 1,800 DEG -3,000 DEG C. Under these conditions the process is continued to full conversion of hexagonal boron nitride to cubic modification thereof. The process can be conducted in the presence of 0.5 to 10% by weight of a catalyst contributing to the conversion of hexagonal boron nitride into its cubic modification. The main portion of the catalyst is concentrated in the central portion of the volume of hexagonal boron nitride, the remainder - in the peripheral portion. The present invention is useful in the manufacture of super-hard materials which, in turn, can be used in the industry of cutting tools.</description><subject>ARTIFICIAL STONE</subject><subject>CEMENTS</subject><subject>CERAMICS</subject><subject>CHEMISTRY</subject><subject>COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS</subject><subject>CONCRETE</subject><subject>LIME, MAGNESIA</subject><subject>METALLURGY</subject><subject>REFRACTORIES</subject><subject>SLAG</subject><subject>TREATMENT OF NATURAL STONE</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1983</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZCgKCPJ3dnVxVQCigCDXAMcgxxBPfz8w198n0jnIMzjEMTQCxPfzDAkKDQKrdPIH0s6hTp6Boa4KriEElTp6-gV7Kvg7hbj6hQbzMLCmJeYUp_JCaW4GBTfXEGcP3dSC_PjU4oLE5NS81JJ4tyAjUyMzE0NjR0NjIpQAAMmMN90</recordid><startdate>19831110</startdate><enddate>19831110</enddate><creator>G. M. ZHDANOVICH, A. I. DUDYAK, M. I. GALKOV, V. P. BARABAN, J. V. ZHEREBTSOV, A. P. ZHOLOB ET M. M. ZHUK</creator><scope>EVB</scope></search><sort><creationdate>19831110</creationdate><title>PROCEDE DE PREPARATION DE POLYCRISTAUX DE NITRURE DE BORE CUBIQUE ET POLYCRISTAUX DE NITRURE DE BORE AINSI OBTENUS</title><author>G. M. ZHDANOVICH, A. I. DUDYAK, M. I. GALKOV, V. P. BARABAN, J. V. ZHEREBTSOV, A. P. ZHOLOB ET M. M. ZHUK</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_FR2526413A13</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>fre</language><creationdate>1983</creationdate><topic>ARTIFICIAL STONE</topic><topic>CEMENTS</topic><topic>CERAMICS</topic><topic>CHEMISTRY</topic><topic>COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS</topic><topic>CONCRETE</topic><topic>LIME, MAGNESIA</topic><topic>METALLURGY</topic><topic>REFRACTORIES</topic><topic>SLAG</topic><topic>TREATMENT OF NATURAL STONE</topic><toplevel>online_resources</toplevel><creatorcontrib>G. M. ZHDANOVICH, A. I. DUDYAK, M. I. GALKOV, V. P. BARABAN, J. V. ZHEREBTSOV, A. P. ZHOLOB ET M. M. ZHUK</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>G. M. ZHDANOVICH, A. I. DUDYAK, M. I. GALKOV, V. P. BARABAN, J. V. ZHEREBTSOV, A. P. ZHOLOB ET M. M. ZHUK</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>PROCEDE DE PREPARATION DE POLYCRISTAUX DE NITRURE DE BORE CUBIQUE ET POLYCRISTAUX DE NITRURE DE BORE AINSI OBTENUS</title><date>1983-11-10</date><risdate>1983</risdate><abstract>L'INVENTION CONCERNE LA FABRICATION DE MATERIAUX EXTRA-DURS PAR APPLICATION A CEUX-CI DE PRESSIONS ET DE TEMPERATURES ELEVEES.LE PROCEDE FAISANT L'OBJET DE L'INVENTION EST CARACTERISE EN CE QU'ON FAIT AGIR SUR LE NITRURE DE BORE HEXAGONAL UNE PRESSION DE 40 A 70.10 KPA ET UNE TEMPERATURE DE 1200 A 1800C, QU'ON CESSE LE CHAUFFAGE APRES QUE LE TAUX DE CONVERSION DU NITRURE DE BORE HEXAGONAL EN NITRURE DE BORE CUBIQUE AIT ATTEINT UNE VALEUR COMPRISE ENTRE 20 ET 65 EN POIDS, ET QU'ON PORTE LA PRESSION JUSQU'A UNE VALEUR DE 80 A 120.10 KPA, APRES QUOI ON RETABLIT LE CHAUFFAGE ET ON PORTE LA TEMPERATURE JUSQU'A UNE VALEUR DE 1800 A 3000C, PUIS ON MAINTIENT CE REGIME DE TRAITEMENT PENDANT UN INTERVALLE DE TEMPS SUFFISANT POUR LA CONVERSION TOTALE DE NITRURE DE BORE HEXAGONAL EN NITRURE DE BORE CUBIQUE.LES POLYCRISTAUX OBTENUS PEUVENT ETRE UTILISES PAR EXEMPLE POUR LE PASTILLAGE D'OUTILS DE COUPE, DE COURONNES DE FORAGE, DE FRAISES ET D'AUTRES OUTILS.
A process for producing polycrystals of cubic boron nitride which comprises exposure of hexagonal boron nitride to a pressure of from 40 to 70 kbar at a temperature of from 1,200 DEG to 1,800 DEG C. When the conversion of hexagonal boron nitride to cubic boron nitride reaches 20 to 65% by weight, the heating is switched off and pressure is increased to a value of from 80 to 120 kbar. Then the heating is resumed and temperature is elevated to 1,800 DEG -3,000 DEG C. Under these conditions the process is continued to full conversion of hexagonal boron nitride to cubic modification thereof. The process can be conducted in the presence of 0.5 to 10% by weight of a catalyst contributing to the conversion of hexagonal boron nitride into its cubic modification. The main portion of the catalyst is concentrated in the central portion of the volume of hexagonal boron nitride, the remainder - in the peripheral portion. The present invention is useful in the manufacture of super-hard materials which, in turn, can be used in the industry of cutting tools.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE LIME, MAGNESIA METALLURGY REFRACTORIES SLAG TREATMENT OF NATURAL STONE |
| title | PROCEDE DE PREPARATION DE POLYCRISTAUX DE NITRURE DE BORE CUBIQUE ET POLYCRISTAUX DE NITRURE DE BORE AINSI OBTENUS |
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