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Controllable doping method for Si3N4 single-crystal low-dimension nano material

A low-dimensional nano- and single-crystal technology, applied in polycrystalline material growth, single crystal growth, single crystal growth, etc., can solve the problems of inability to control the doping amount and limited doping amount of low-dimensional nano-materials, and achieve low cost , high repeatability, smooth surface effect

Inactive Publication Date: 2007-10-17
NINGBO UNIVERSITY OF TECHNOLOGY +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

But so far, for Si 3 N 4 The research on doping modification is rarely reported, and the methods used in the existing reports are to directly add the desired doped metal element or metal compound to the initial raw material. 3 N 4 The doping amount of low-dimensional nanomaterials is limited, and the doping amount cannot be adjusted

Method used

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  • Controllable doping method for Si3N4 single-crystal low-dimension nano material
  • Controllable doping method for Si3N4 single-crystal low-dimension nano material
  • Controllable doping method for Si3N4 single-crystal low-dimension nano material

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Effect test

Embodiment 1

[0037] Weigh 10 g of the initial raw materials polysilazane and aluminum isopropoxide at a weight ratio of 4:1, put them into a nylon resin ball mill pot for planetary ball milling for 12 hours, and place them in a 99 alumina ceramic crucible after mixing evenly. N of MPa 2 Under the gas protection atmosphere, the temperature was raised from room temperature to 260°C at 10°C / min in a tubular sintering furnace, and kept for 0.5 hours for cross-linking and solidification to obtain an amorphous SiAlCN solid. Put the SiAlCN solid into a nylon resin ball mill jar, add 3wt% FeCl 2 The powder is used as a catalyst in a high-energy ball mill for dry ball milling for 24 hours, and then the SiAlCN powder obtained after the high-energy ball milling is placed in a 99 alumina ceramic crucible, and the flow (200ml / min) of N at 0.1MPa 2Under the protection of gas atmosphere, the temperature was increased from room temperature to 1300 °C in a tube furnace at 10 °C / min for high-temperature py...

Embodiment 2

[0039] Weigh 10 g of the initial raw materials polysilazane and aluminum isopropoxide at a weight ratio of 8:1, put them into a nylon resin ball mill jar for planetary ball milling for 12 hours, mix them uniformly and place them in a 99 alumina ceramic crucible, and place them in a 0.1 N of MPa 2 Under the gas protection atmosphere, the temperature was raised from room temperature to 260°C at 10°C / min in a tubular sintering furnace, and kept for 0.5 hours for cross-linking and solidification to obtain an amorphous SiAlCN solid. Put the SiAlCN solid into a nylon resin ball mill jar, add 3wt% FeCl 2 The powder is used as a catalyst in a high-energy ball mill for dry ball milling for 24 hours, and then the SiAlCN powder obtained after the high-energy ball milling is placed in a 99 alumina ceramic crucible, and the flow (200ml / min) of N at 0.1MPa 2 Under the protection of gas atmosphere, the temperature was increased from room temperature to 1300 °C in a tube furnace at 10 °C / min...

Embodiment 3

[0041] Weigh 10 g of the initial raw materials polysilazane and aluminum isopropoxide at a weight ratio of 16:1, put them into a nylon resin ball mill pot for planetary ball milling for 12 hours, mix them uniformly and place them in a 99 alumina ceramic crucible, and place them in a 0.1 N of MPa 2 Under the gas protection atmosphere, the temperature was raised from room temperature to 260°C at 10°C / min in a tubular sintering furnace, and kept for 0.5 hours for cross-linking and solidification to obtain an amorphous SiAlCN solid. Put the SiAlCN solid into a nylon resin ball mill jar, add 3wt% FeCl 2 The powder is used as a catalyst in a high-energy ball mill for dry ball milling for 24 hours, and then the SiAlCN powder obtained after the high-energy ball milling is placed in a 99 alumina ceramic crucible, and the flow (200ml / min) of N at 0.1MPa 2 Under the protection of gas atmosphere, the temperature was increased from room temperature to 1300 °C in a tube furnace at 10 °C / mi...

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Abstract

A novel process for realizing uniform and controllable doping of Si3N4 single crystal dimension nano materials by organic precursor co-pyrogenation comprises the following concrete steps: (1) ball milling mixing: ball milling and mixing homogeneously two organic precursors (polysilazane and aluminium isopropoxide ) according to different proportions; (2) low temperature cross linkage solidification: cross linkage solidifying after mixing homogeneously to get non-crystalline solids; (4) high-energy ball milling pulverizing: filled the non-crystalline solids to a nylon resin milling tank, introducing a catalyzer therein, and dry method ball milling pulverizing them in a high-energy globe mill; (4) high temperature thermal decomposition: after the high-energy ball milling, thermal decompositing the mixture. Different the traditional doping process, said novel process can realize the regulation and design of uniform doping of Si3N4 single crystal dimension nano material in molecular level by simply regulating the proportionality of two organic precursors, and then realize the regulation of performances such as actinoelectricity of Si3N4 single crystal dimension nano materials. Said process is hopeful to become a general process for realizing controllable doping of single crystal low dimension nano materials.

Description

technical field [0001] The present invention relates to a Si 3 N 4 The invention relates to a new method for controllable doping of single crystal low-dimensional nanomaterials, which belongs to the technical field of material preparation. technical background [0002] When the size of the material is reduced to the nanometer level, due to a series of special effects of nanomaterials, the properties of the material will change greatly, resulting in many new functional properties superior to traditional materials, in fine ceramics, microelectronics , Bioengineering, chemical industry, medicine and other fields of successful application and broad application prospects. In the research of nanomaterials science, the preparation science of nanomaterials occupies an extremely important position, which has an important impact on the microstructure and properties of nanomaterials. [0003] Professor Lieber, a scientist at Harvard University, believes: "The one-dimensional system ...

Claims

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Application Information

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IPC IPC(8): C30B31/00C30B29/38
Inventor 杨为佑刘淑珍王华涛谢志鹏安立楠
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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