Calcium aluminate cement containing calcium aluminate nano whiskers and preparation method thereof
A technology of calcium aluminate cement and nano-whisker is applied in the field of calcium aluminate cement containing calcium aluminate nano-whisker and its preparation, and can solve the problem of difficult to generate nano-whisker-like substances, long generation period and synthesis temperature. High problems, to achieve the effect of reducing production cost, improving operating temperature and service life, and good dispersion
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Embodiment 1
[0030] This embodiment adopts calcium carbonate (purity ≥ 99.0%), calcium oxide powder (purity ≥ 99.0%), aluminum powder (purity ≥ 99.0%) and aluminum oxide (purity ≥ 99.0%) as raw materials, by mass percentage, calcium carbonate Powder (purity ≥ 99.0%) is 11%, calcium oxide powder (purity ≥ 99.0%) is 25%, aluminum powder (purity ≥ 99.0%) is 9%, alumina (purity ≥ 99.0%) is 55%; mix The uniform raw materials are put into the mold, and then they are dry-pressed into a cylindrical sample with a diameter of 20mm, a height of 15mm, and a relative density of 50%. After the molding is completed, the sample is demolded and placed Into the self-propagating high-temperature reaction furnace, place the C-Ti igniter on the sample, the self-propagating high-temperature synthesis reaction is initiated by the heat generated by the Ti-C reaction placed on the top of the sample, and the reaction between Ti and C passes through a Initiated by tungsten wire;
[0031] Under the condition of airt...
Embodiment 2
[0034] The difference between this embodiment and Example 1 is: by mass percentage, calcium carbonate (purity ≥ 99.0%) is 12%, calcium oxide powder (purity ≥ 99.0%) is 27%, aluminum powder (purity ≥ 99.0%) is 19%, alumina (purity ≥ 99.0%) is 42%;
[0035] Scanning electron microscope analysis (SEM) has been carried out to the calcium aluminate prepared by embodiment 2, see Figure 4 and 5 , indicating that the calcium aluminate cement prepared in Example 2 contains calcium aluminate nano-whiskers, the length of the nano-whiskers is about 5 μm, and the diameter is about 185 nm. After testing, the calcium aluminate cement prepared in this example contains ingredients including monocalcium aluminate (CA), dicalcium aluminate (CA 2 ), dodecacalcium heptaaluminate (C 12 A 7 ), the content of each component is 62%, 31%, 7% respectively.
Embodiment 3
[0037] The difference between this embodiment and Example 1 is: by mass percentage, calcium carbonate (purity ≥ 99.0%) is 13%, calcium oxide powder (purity ≥ 99.0%) is 30%, aluminum powder (purity ≥ 99.0%) is 36%, alumina (purity ≥ 99.0%) is 21%;
[0038] The calcium aluminate cement prepared in embodiment 3 has been carried out XRD and SEM analysis, see Image 6 and 7 , indicating that the calcium aluminate cement prepared in Example 3 contains calcium aluminate nano-whiskers, and the length of the nano-whiskers is about 3 μm and the diameter is about 185 nm. After testing, the calcium aluminate cement prepared in this example contains ingredients including monocalcium aluminate (CA), dicalcium aluminate (CA 2 ), dodecacalcium heptaaluminate (C 12 A 7 ), the content of each component is 62%, 34%, 4% respectively.
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Abstract
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