Teplofizika vysokikh temperatur
 RUS  ENG JOURNALS   PEOPLE   ORGANISATIONS   CONFERENCES   SEMINARS   VIDEO LIBRARY   PACKAGE AMSBIB
 General information Latest issue Forthcoming papers Archive Impact factor Guidelines for authors Submit a manuscript Search papers Search references RSS Latest issue Current issues Archive issues What is RSS

 TVT: Year: Volume: Issue: Page: Find

 TVT, 2007, Volume 45, Issue 6, Pages 856–861 (Mi tvt1208)

Thermophysical Properties of Materials

The effect of vacuum on the reflectivity of alumina ceramics under conditions of melting by concentrated laser radiation and subsequent free cooling

A. Yu. Vorob'ev, V. A. Petrov, V. E. Titov, S. A. Ulybin

Institute of Extremal States Thermophysics, Scientific Association for High Temperatures, Russian Academy of Sciences, Moscow

Abstract: The results are given of measurements of the normal-hemispherical reflectivity of alumina ceramics in the semitransparency region for the wavelengths of $0.488$, $0.6328$, $1.15$, and $3.39$ $\mu$m. The measurements are performed in vacuum both in the process of fast heating by concentrated radiation of a $CO_2$ laser from room temperature to $\sim2900$ K with the formation of a thin layer of melt and in the process of subsequent cooling after the heating radiation is switched off. The heating time is approximately $2.25$ s, with the density of heating radiation flux of approximately $1600$ W/cm$^2$. The effect of abrupt variation of the absorption coefficient during melting and solidification on the thermal-radiation characteristics is analyzed. The results demonstrate that the absorption coefficient of the melt in the semitransparency region is higher in vacuum than in the air.

Full text: PDF file (647 kB)

English version:
High Temperature, 2007, 45:6, 779–784

Bibliographic databases:

UDC: 535.3 + 535.36 + 535.20
PACS: 42.25.bs

Citation: A. Yu. Vorob'ev, V. A. Petrov, V. E. Titov, S. A. Ulybin, “The effect of vacuum on the reflectivity of alumina ceramics under conditions of melting by concentrated laser radiation and subsequent free cooling”, TVT, 45:6 (2007), 856–861; High Temperature, 45:6 (2007), 779–784

Citation in format AMSBIB
\Bibitem{VorPetTit07} \by A.~Yu.~Vorob'ev, V.~A.~Petrov, V.~E.~Titov, S.~A.~Ulybin \paper The effect of vacuum on the reflectivity of alumina ceramics under conditions of melting by concentrated laser radiation and subsequent free cooling \jour TVT \yr 2007 \vol 45 \issue 6 \pages 856--861 \mathnet{http://mi.mathnet.ru/tvt1208} \elib{https://elibrary.ru/item.asp?id=9568221} \transl \jour High Temperature \yr 2007 \vol 45 \issue 6 \pages 779--784 \crossref{https://doi.org/10.1134/S0018151X07060089} \isi{http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&DestLinkType=FullRecord&DestApp=ALL_WOS&KeyUT=000251794600008} \elib{https://elibrary.ru/item.asp?id=13548010} \scopus{https://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-37249006838} 

• http://mi.mathnet.ru/eng/tvt1208
• http://mi.mathnet.ru/eng/tvt/v45/i6/p856

 SHARE:

Citing articles on Google Scholar: Russian citations, English citations
Related articles on Google Scholar: Russian articles, English articles

This publication is cited in the following articles:
1. V. A. Petrov, “Thermoradiation characteristics of refractory oxides upon heating by concentrated laser radiation”, High Temperature, 54:2 (2016), 186–196
2. Larichev M.N., Belyaev G.E., Stepanov I.G., Velichko A.M., “Application of Two-Color Pyrometer For Studying of Flying Luminous Particles: Products of Alumina Laser Ablation”, Rev. Sci. Instrum., 90:4 (2019), 043904