The our country research to expensive chromic fireproof stuff, improve main body to show in the following respects:
(Of 1) raw material optimize.
In the tall chromic brick that imports first, cr2O3 raw material basically is agglomeration Cr2O3. Raw material of Cr2O3 of opposite Yu Dianrong (opposite density is 95.2%) and character, the opposite density of agglomeration Cr2O3 (91.2%) is lesser, the density that produces product and intensity are inferior, the aggressivity that fight broken bits and fight broken bits osmotic poorer, flake serious, fight erode the effect is not quite good. Homebred after changing, our country undertook in raw material respect many experiment works, cr2O3 of the frit that use phone replaces agglomeration Cr2O3, make the function index of tall chromic brick got great improvement. Additional, active homebred Gao Ge added the monocline zirconia of 2% in the brick, the photograph that uses monocline zirconia changes add pliable but strong, raised the heatproof shake sex of tall chromic brick apparently, improved its service life then. In the meantime, be aimed at tall chromic brick hard the character of agglomeration, in add active alumina the respect such as Cr of Cr2O3 of rice of small pink, accept, TiO2, metal also undertook study, obtained much research positive result.
(2) is firing of craft optimize improve.
Be aimed at tall chromic brick hard the problem of agglomeration, personnel of our country technology undertook to the agglomeration craft of Cr2O3 goods the key tackles key problem, in the light of different agglomeration atmosphere, oxygen cent pressing, firing the element such as time of temperature, heat preservation is right the grain change of Cr2O3 goods, product is compact change had relevant test, think to be in only proper oxygen cent presses a condition to fall, cr2O3 just won't by CO reductive, cr2O3 have more than needed, solid solution can be fashioned below inferior temperature with Al2O3, the agglomeration that is helpful for Cr2O3 material is compact change (1) seeing a picture. Accordingly, to promote agglomeration, took powder of such as carbon bag Fu, compound the agglomeration that buries charcoal, Ar to enrage protection and CO-CO2 to mix the measure such as gas to improve and optimize Cr2O3 material, improved the performance of expensive chromic fireproof stuff considerably.
The Al2O3-Cr2O3 system in different mood
Graph the Al2O3-Cr2O3 system in 1 different mood
(3) in addition, a few investigator still studied the function of fireproof to Gao Ge material such as ground rice of collosol of TiO2, MgO, La2O3, Y2O3, Ce(OH)3, accept and manufacturing cost manufacturing influence.
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