Preparation method of pure-phase lanthanum titanium aluminium composite oxides LaTi2Al9O19 and usage
A composite oxide, titanium-aluminum technology, applied in the field of preparation of pure-phase lanthanum-titanium-aluminum composite oxide LaTi2Al9O19, can solve problems such as difficult single phase, expensive raw materials, and huge single unit cell, and achieve low cost, high efficiency, The effect of process stability
Inactive Publication Date: 2009-12-09
李国武 +3
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Problems solved by technology
[0002] In 1983, LaTi 2 al 9 o 19 It was first reported by Morgan (see P.E.D.Morgan, Material Research Bulletin, 1984V19, P369~376, Preparing new extremely difficult-to-form crystal structures), due to the complex crystal structure, the single unit cell is huge, and the unit cell contains more than 200 atoms , the bond is strong, so it can be used as a curing agent for radioactive nuclear waste such as Sr, Cs, etc., but due to its complex structure, it is difficult to form a single phase, so it prevents the development of its further application performance
In 1994, although Russel E. Morris et al. 2 al 9 o 19 The preparation method of La3Ti5Al15O37 has been improved (see Russel E.Morris etal, Journal of Solid State Chemistry, 1994V111, P52-57, Determination of Complex Structures from Powder DiffractionData: The Crystal Structure of La3Ti5Al15O37), but this method uses expensive raw materials and complicated operation process , and there is still a small amount of TiO2 impurity phase at the end, which does not achieve good results
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Embodiment 1
[0016] Embodiment 1 raw material is according to following proportioning (mol ratio): La 2 o 3 :TiO 2 : Al2O3=1:4:9 Weighing, according to the weight ratio of the mixture to deionized water and corundum balls is 1:2:2, add deionized water and corundum balls respectively, ball mill in a ball mill for 20h, at 150°C Dry it, place it in a corundum crucible, and calcinate at 1500°C for 3 hours, then cool down by 7°C per hour to 1000°C, and then cool down with the furnace to get pure phase LaTi 2 al 9 o 19 Powder.
Embodiment 2
[0017] Embodiment 2 raw materials are according to following proportioning (mol ratio): La 2 o 3 :TiO 2 :Al 2 o 3 = 1:4:9 Weighing, according to the weight ratio of the mixture to deionized water and corundum balls is 1:2:2, add deionized water and corundum balls respectively, ball mill in a ball mill for 15 hours, and dry at 200°C , placed in a corundum crucible, calcined at 1550°C for 2 hours, then cooled down by 15°C per hour to 900°C, and then cooled with the furnace to obtain pure phase LaTi 2 al 9 o 19 Powder.
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The invention relates to the development of a preparation method and application of a pure-phase lanthanum-titanium-aluminum composite oxide (LaTi2Al9O19). According to the present invention, the molar ratio of La2O3:TiO2:Al2O3=1:4:9 proportioning raw materials; respectively adding deionized water and corundum balls into the mixture, mixing and ball milling in a ball mill, drying at 150-200°C, placing In the corundum crucible, the required materials are obtained by calcining at a high temperature of 1450-1500 °C. The LaTi2Al9O19 produced by the invention has excellent thermal properties and has broad application prospects in the field of aviation and aerospace high-temperature coating materials.
Description
technical field [0001] The invention relates to a pure-phase lanthanum-titanium-aluminum composite oxide LaTi 2 al 9 o 19 The development of the preparation method and application of the invention belongs to the field of preparation and application of inorganic materials. Background technique [0002] In 1983, LaTi 2 al 9 o 19 It was first reported by Morgan (see P.E.D.Morgan, Material Research Bulletin, 1984V19, P369~376, Preparing new extremely difficult-to-form crystal structures), due to the complex crystal structure, the single unit cell is huge, and the unit cell contains more than 200 atoms , the bond is strong, so it can be used as a curing agent for radioactive nuclear waste such as Sr and Cs, but due to its complex structure, it is difficult to form a single phase, so it prevents the development of its further application performance. In 1994, although Russel E. Morris et al. 2 al 9 o 19 The preparation method of La3Ti5Al15O37 has been improved (see Russel...
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IPC IPC(8): C01G1/02C04B35/10C04B35/622
Inventor 李国武徐凯江阔熊明
Owner 李国武