LV14556A - Oxide ceramics characterized by elevated strength. - Google Patents

Oxide ceramics characterized by elevated strength.

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Publication number
LV14556A
LV14556A LVP-12-80A LV120080A LV14556A LV 14556 A LV14556 A LV 14556A LV 120080 A LV120080 A LV 120080A LV 14556 A LV14556 A LV 14556A
Authority
LV
Latvia
Prior art keywords
centigrade
temperature
hardness
ceramics
strength
Prior art date
Application number
LVP-12-80A
Other languages
Latvian (lv)
Other versions
LV14556B (en
Inventor
Gaida Sedmale
Ingunda ŠPERBERGA
Ints ŠTEINS
Jānis GRABIS
Original Assignee
Rīgas Tehniskā Universitāte
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rīgas Tehniskā Universitāte filed Critical Rīgas Tehniskā Universitāte
Priority to LVP-12-80A priority Critical patent/LV14556B/en
Publication of LV14556A publication Critical patent/LV14556A/en
Publication of LV14556B publication Critical patent/LV14556B/en

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  • Compositions Of Oxide Ceramics (AREA)

Abstract

The present invention relates to the high-temperature dense mullite-corundum-ZrO2 oxide ceramic materials obtained at elevated (above 600oC). Due to their high melting/decomposition temperature (at about 1550oC) they are long-time exploitable at temperatures equal or above 1000oC maintaining shape stability and characteristic parameters of properties. Dominant are strength ratio (pressure and flexural strength, elastic modulus) as well as chemical and thermal resistance. High parameter of hardness and wear resistance broadens their application at room temperature. Described ceramics could be obtained from mixed composition powder with 50-450 nanometer particle size dispersion. Powders consist of (in weight %): (gamma)A2O3 - 56,47 to 63,05; amorphous SiO2 - 22,25 to 27,10; ZrO2(monoclinic) - 3,60 to 3,45; Y2O3 - 3,39 to 3,60; illite-clay - 0,5 to 8,57 and La2O3 - 4,60 to 0,40. The offered mixture of raw materials guarantees formation of dense ceramics at temperature range from 1200 to 1400 centigrade, using spark plasma sintering method in 3-6 Pa vacuum and temperature raising rate 100 centigrade per minute up to maximum temperature. The ceramics obtained in such way (sintering at 1200 centigrade) possesses pressure strength 270 to 372 MPa as well as long-term temperatures resistance up to 1200 centigrade. The hardness of obtained ceramics is between 9 and 10 in accordance with Mohs’ hardness scale (it is approaching to hardness of diamond).
LVP-12-80A 2012-05-18 2012-05-18 Oxide ceramics characterized by elevated strength. LV14556B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
LVP-12-80A LV14556B (en) 2012-05-18 2012-05-18 Oxide ceramics characterized by elevated strength.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LVP-12-80A LV14556B (en) 2012-05-18 2012-05-18 Oxide ceramics characterized by elevated strength.

Publications (2)

Publication Number Publication Date
LV14556A true LV14556A (en) 2012-07-20
LV14556B LV14556B (en) 2012-12-20

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ID=50152887

Family Applications (1)

Application Number Title Priority Date Filing Date
LVP-12-80A LV14556B (en) 2012-05-18 2012-05-18 Oxide ceramics characterized by elevated strength.

Country Status (1)

Country Link
LV (1) LV14556B (en)

Also Published As

Publication number Publication date
LV14556B (en) 2012-12-20

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