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Preparation method of chromium molybdate micron-nanometer material

A micro-nano, molybdic acid technology, applied in chemical instruments and methods, molybdenum compounds, inorganic chemistry, etc., can solve the problems of difficult to control hydrolysis rate, less research on preparation methods, difficult to control crystal shape, etc., and achieve industrialized mass production. , the effect of easy operation and control, low preparation cost

Inactive Publication Date: 2016-11-16
BOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on its preparation methods, especially the preparation of chromium molybdate by chemical methods is mainly prepared by sol-gel method.
However, because the hydrolysis rate is not easy to control, the crystal shape is difficult to control, the yield is low, and the purity is not high.

Method used

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  • Preparation method of chromium molybdate micron-nanometer material
  • Preparation method of chromium molybdate micron-nanometer material
  • Preparation method of chromium molybdate micron-nanometer material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Prepare an aqueous solution of molybdic acid, chromium nitrate and oxalic acid, heat at 100°C, and evaporate water under the condition of a stirring speed of 300 rpm. The molar ratios of molybdic acid, chromium nitrate and oxalic acid are 3:2:30. The molar concentration of molybdic acid is 0.05 mol / L, and that of oxalic acid is 0.5 mol / L. After evaporating the water, carry out the cross-linking reaction, the reaction temperature is 200 °C, and the reaction time is 2 hours. After the cross-linking reaction is completed, the high-temperature reaction is carried out in the muffle furnace. The high-temperature reaction temperature is 600 °C, and the reaction time is 4 h. . After natural cooling, the target product is obtained. The product size is 0.5μm, and the yield of the product is 99.1%; the product purity is 99.5%, and the impurity content: carbon is less than 0.5%; the absorption peak.

Embodiment 2

[0033] Prepare an aqueous solution of molybdic acid, chromium nitrate and oxalic acid, heat at 100°C, and evaporate water under the condition of a stirring speed of 60 rpm. Among them, the molar ratio of molybdic acid, chromium nitrate and oxalic acid is 3:2:60. The molar concentration of molybdic acid is 0.05 mol / L, and that of oxalic acid is 0.5 mol / L. After the water was evaporated, the cross-linking reaction was carried out. The reaction temperature was 400 °C and the reaction time was 2 hours. After the cross-linking reaction was completed, the high-temperature reaction was carried out in a muffle furnace. . After natural cooling, the target product is obtained. The size of the product is 0.9 μm, and the yield of the product is 99.6%; the purity of the product is 99.7%, and the impurity content: carbon is less than 0.3%; the absorption peak.

Embodiment 3

[0035] Prepare an aqueous solution of molybdic acid, chromium nitrate and oxalic acid, heat at 100°C, and evaporate water under the condition of a stirring speed of 120 rpm. Among them, the molar ratio of molybdic acid, chromium nitrate and oxalic acid is 3:2:50. The molar concentration of molybdic acid is 0.05 mol / L, and that of oxalic acid is 0.5 mol / L. After evaporating the water, carry out the cross-linking reaction, the reaction temperature is 150 °C, and the reaction time is 4 hours. After the cross-linking reaction is completed, the high-temperature reaction is carried out in the muffle furnace. The high-temperature reaction temperature is 600 °C, and the reaction time is 4 h. . After natural cooling, the target product is obtained. The product size is 0.5μm, and the yield of the product is 99.5%; the product purity is 99.6%, and the impurity content: carbon is less than 0.4%; the absorption peak.

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Abstract

The invention belongs to the technical field of functional material preparation, and relates to a preparation method of a chromium molybdate micron-nanometer material. The preparation method comprises the steps that molybdic acid and chromic nitrate are dissolved in an oxalic acid aqueous solution, water is evaporated to dryness on the condition that heating and stirring are conducted, a cross-linking reaction is conducted, heat treatment is conducted in a muffle furnace, and the chromium molybdate micron-nanometer material is obtained. According to the preparation method of the chromium molybdate micron-nanometer material, the technology is simple, convenient and easy to carry out, the purity is high, the impurity content is low, the product preparation cost is low, the performance is excellent, and industrial mass production can be conducted. The prepared chromium molybdate micron-nanometer material serves as a negative thermal expansion to use, and a wide application prospect in the aspects of aerospace materials, engine parts, integrated circuit boards, optical devices and the like is achieved.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and in particular relates to a preparation method of chromium molybdate micro-nano material. Background technique [0002] Most materials have thermal expansion and contraction behavior when the external temperature changes, but there are also a few materials that have abnormal thermal expansion properties, and their volume shrinks with the increase of external temperature, that is, negative thermal expansion behavior. The application fields of negative thermal expansion materials are very wide. Not only can they be combined with conventional materials to form high-temperature ceramic devices with low thermal expansion or close to zero thermal expansion coefficients, they can be applied in aerospace materials, engine components, integrated circuit boards, optical devices, etc. There are also potential applications in light, electricity, and magnetism, so the research o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/00
CPCC01G39/00C01P2002/72C01P2002/84C01P2004/03C01P2004/62C01P2006/80
Inventor 张杰许家胜
Owner BOHAI UNIV
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