RU2226516C1 - Method of preparing composite material al203-al - Google Patents

Method of preparing composite material al203-al Download PDF

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Publication number
RU2226516C1
RU2226516C1 RU2002133903/03A RU2002133903A RU2226516C1 RU 2226516 C1 RU2226516 C1 RU 2226516C1 RU 2002133903/03 A RU2002133903/03 A RU 2002133903/03A RU 2002133903 A RU2002133903 A RU 2002133903A RU 2226516 C1 RU2226516 C1 RU 2226516C1
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RU
Russia
Prior art keywords
temperature
polyvinyl alcohol
microns
self
propagating high
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RU2002133903/03A
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Russian (ru)
Inventor
Д.А. Иванов
А.А. Ильин
А.И. Ситников
пин С.Д. Шл
С.Д. Шляпин
А.В. Арефьев
Original Assignee
"МАТИ"-Российский государственный технологический университет им. К.Э. Циолковского
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Priority to RU2002133903/03A priority Critical patent/RU2226516C1/en
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Abstract

FIELD: composite materials. SUBSTANCE: invention relates to composite materials technology belonging to oxide-metal materials and can be utilized when manufacturing strong, wear-resistant articles with relatively low bulk weight as well as for manufacturing abrasive tools with particular surface properties. Preparation procedure comprises blending aluminum powder having lamellar-shaped particles, finely ground sodium silicate glass powder, and polyvinyl alcohol solution followed by squeezing resulting blend to give laminated compacted material, which is then divided to form laminated granules consisting of interconnected lamellar-shaped particles, which are poured into steel mold and compacted. Thus obtained crude product is fired to remove polyvinyl alcohol and self-propagating high-temperature synthesis process is then initiated. Isothermal ageing is followed by cooling at ambient temperature resulting in appearance of fine-grained alumina coating on the surface of product. EFFECT: increased strength and impact resistance of material at the same relatively low bulk weight and enabled formation of dense thin fine-grained alumina coating. 4 dwg, 1 tbl, 3 ex

Description

Текст описания в факсимильном виде (см. графическую часть).Description text in facsimile form (see graphic part).

Claims (1)

Способ получения композиционного материала Аl2О3 - Аl, включающий приготовление шихты смешиванием порошка алюминия с оксидным компонентом, формование, инициирование процесса самораспространяющегося высокотемпературного синтеза и охлаждение, отличающийся тем, что используемый алюминиевый порошок с частицами, имеющими пластинчатую форму, длиной 10 - 100 мкм, шириной 5-50 мкм и толщиной 0,5 - 1 мкм, перед смешиванием нагревают на воздухе до температуры 220 - 250°С и выдерживают в течение 2-3 ч, в качестве оксидного компонента используют тонкомолотый порошок натриево-силикатного стекла с размером частиц 1-40 мкм, дополнительно в шихту вводят 5-7%-ный раствор поливинилового спирта при следующем соотношении компонентов, об.%: алюминий 76,94 - 87,54, натриево-силикатное стекло 1,01 - 8,89, раствор поливинилового спирта 11,44 -14,16, перед формованием шихту высушивают до остаточной влажности 3 - 10% и обжимают давлением 200 - 500 МПа, полученный компакт измельчают растиранием до образования слоистых гранул размером 40 - 80 мкм, формование осуществляют путем прессования засыпки слоистых гранул под давлением 0,5 -1,0 от давления обжатия шихты, перед инициированием процесса самораспространяющегося высокотемпературного синтеза поливиниловый спирт выжигают на воздухе при температуре 300 - 350°С в течение 3-5 ч, процесс самораспространяющегося высокотемпературного синтеза инициируют путем нагрева воздушным теплоносителем со скоростью 30 - 50°С/мин до температуры 900 - 950°С при времени изотермической выдержки 10-30 мин, после ее окончания охлаждение производят путем выемки нагретого материала из печного пространства и его выдержки при комнатной температуре.A method of obtaining a composite material Al 2 O 3 - Al, including the preparation of a mixture by mixing aluminum powder with an oxide component, molding, initiating a process of self-propagating high-temperature synthesis and cooling, characterized in that the aluminum powder used with particles having a lamellar shape, length 10 - 100 microns , with a width of 5-50 microns and a thickness of 0.5 - 1 microns, before mixing, they are heated in air to a temperature of 220 - 250 ° C and incubated for 2-3 hours, finely ground sodium silicate glass powder with a particle size of 1-40 μm, an additional 5-7% solution of polyvinyl alcohol is added to the mixture in the following ratio of components, vol.%: aluminum 76.94 - 87.54, sodium silicate glass 1, 01 - 8.89, a solution of polyvinyl alcohol 11.44 -14.16, before molding the mixture is dried to a residual moisture content of 3 - 10% and squeezed with a pressure of 200 - 500 MPa, the resulting compact is ground by grinding to form layered granules with a size of 40 - 80 microns, molding is carried out by pressing the filling of layered granules under a pressure of 0.5 -1.0 from yes After compression of the charge, before initiating the process of self-propagating high-temperature synthesis, polyvinyl alcohol is burned out in air at a temperature of 300 - 350 ° C for 3-5 hours, the process of self-propagating high-temperature synthesis is initiated by heating with an air coolant at a speed of 30 - 50 ° C / min to a temperature of 900 - 950 ° C with an isothermal exposure time of 10-30 minutes, after its completion, cooling is carried out by removing the heated material from the furnace space and holding it at room temperature.
RU2002133903/03A 2002-12-17 2002-12-17 Method of preparing composite material al203-al RU2226516C1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2521009C1 (en) * 2012-12-25 2014-06-27 Федеральное государственное унитарное предприятие "Научно-исследовательский институт стандартизации и унификации" ФГУП "НИИСУ" METHOD OF OBTAINING COMPOSITE MATERIAL Al-Al2O3
RU2754616C2 (en) * 2017-01-31 2021-09-06 Сен-Гобен Сантр Де Решерш Э Д'Этюд Эропен Dense sintered product

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ЛЕВАШОВ Е. А. и др. Физико-химические и технологические основы самораспространяющегося высокотемпературного синтеза. - М.: Бином, 1999, с.8. *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2521009C1 (en) * 2012-12-25 2014-06-27 Федеральное государственное унитарное предприятие "Научно-исследовательский институт стандартизации и унификации" ФГУП "НИИСУ" METHOD OF OBTAINING COMPOSITE MATERIAL Al-Al2O3
RU2754616C2 (en) * 2017-01-31 2021-09-06 Сен-Гобен Сантр Де Решерш Э Д'Этюд Эропен Dense sintered product

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MM4A The patent is invalid due to non-payment of fees

Effective date: 20071218

NF4A Reinstatement of patent

Effective date: 20090920

MM4A The patent is invalid due to non-payment of fees

Effective date: 20131218