Nano-diamond surface boronation method

A technology of nano-diamond and boron source, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of low thermal stability and poor anti-oxidation ability, so as to improve anti-oxidation performance and synthesize The effect of simple process and simple synthesis process

Inactive Publication Date: 2016-11-16
DALIAN UNIV OF TECH
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Problems solved by technology

However, judging from the characteristics of nano-diamond, its thermal stability is low and its oxidation resistance is p

Method used

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  • Nano-diamond surface boronation method
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  • Nano-diamond surface boronation method

Examples

Experimental program
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Example Embodiment

[0028] Example 1

[0029] According to the attached figure 1 Process technology process. First, 5 g of boron oxide (containing 1.57 g of boron) was used to prepare an aqueous solution, and 5 g of nanodiamond was weighed and mixed with boric acid aqueous solution (the mass ratio of boron to carbon elements: B:C=31.4%). Then, it was slowly heated to 350°C in a muffle furnace to evaporate excess water. The dried product was then placed in a crucible, moved to a vacuum furnace, heated to 1000 °C, and kept for 20 min. The product is taken out, washed with water, dried, and granulated to obtain nano-diamond powder with boride on the surface. Finally, a series of tests and characterizations were carried out on the obtained boride nano-diamond powder.

[0030] like figure 1 XRD patterns of nano-diamond raw material and boride nano-diamond, respectively. As can be seen from the figure, the original nanodiamond crystal form is a single cubic diamond (as shown in curve 1), and the ...

Example Embodiment

[0033] Example 2

[0034] Take 5g of nano-diamond, according to B:C=5~100%, and the mass of 2.381~47.625g Na 2 B 4 O 7 ·10H 2 Mix O water and liquid evenly, dry at 450°C, move to a high-temperature sintering furnace, heat to 880-1100°C in hydrogen, keep the constant temperature for 20-120min, take out the product, wash with water, dry, and granulate to obtain boron similar to Example 1. chemical nanodiamonds.

[0035] Partial physical and chemical properties of borax decahydrate (sodium borate): lose eight molecules of crystal water at 60 ° C, lose all crystal water at 320 ° C, melting point 741 ° C, boiling point 1575 ° C, temperature 878 ° C melted into glass, melt Contains acidic oxides (boron oxide).

Example Embodiment

[0036] Example 3

[0037] Take 5g of nano-diamond, mix it with 1.525-30.5g boric acid aqueous solution according to B:C=5~100%, evaporate excess water in a horse boiler at 450℃, move it to a high temperature sintering furnace, heat it to 500~1100℃ under nitrogen protection, Constant temperature for 20-120min, take out the product, wash with water, dry, and granulate to obtain boronized nanodiamond similar to Example 1.

[0038] Partial physicochemical properties of boric acid: heated to 70-100 ℃ and gradually dehydrated to form metaboric acid, 150-160 ℃ to generate pyroboric acid, 300 ℃ to generate boric anhydride (boron trioxide), 450 ℃ of boric anhydride (boron oxide) in molten state , 600 ° C is a very viscous liquid with a boiling point of 1500 ° C.

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Abstract

The invention discloses a nano-diamond surface boronation method and belongs to the field of material processing. Nano-diamond particles and water-soluble boron sources are uniformly mixed and calcined in an oxygen-free environment at the temperature of 500-1,100 DEG C, finally, the water-soluble boron sources are washed away, and boronized nano-diamond particles coated with boron elements on the surfaces are prepared. The initial oxidation temperature of the prepared boronized nano-diamond particles in air is increased to 625 DEG C, 68% of diamond is not oxidized after the prepared boronized nano-diamond particles are heated to 1,150 DEG C, and the oxidation resistance of the nano-diamond is greatly improved; the boronized nano-diamond particles contain a large quantity of boron-oxygen hydrophilic groups on the surfaces, and dispersion in the solution is facilitated. A synthesis technology of the prepared nano-diamond boronized particles adopts a simple technique process and is efficient, environment-friendly and safe.

Description

technical field [0001] The invention belongs to the field of nano material processing and discloses a method for boriding the surface of nano diamond. Background technique [0002] The nano-diamond powder material synthesized by the detonation method not only exhibits the characteristics of the diamond synthesized by the traditional method, but also has the properties of nanoparticles [Reference: Chen Quan, Hui Shourong. Synthesis of nano-diamonds by explosive detonation and its application[J]. Acta Synthetic Crystallography, 2000, 29(1):90-93]. Due to the advantages of good thermal conductivity, low thermal expansion coefficient, high dielectric coefficient, high hardness, good mechanical properties, chemical stability, etc., it is widely used in electroplating, composite plating, electronic devices, ultra-precision polishing, lubrication, and even medical biology, etc. field, nanodiamond has a wide range of application value. However, due to the large specific surface ar...

Claims

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Application Information

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IPC IPC(8): C01B31/06B82Y30/00
CPCC01P2002/72C01P2002/88C01P2004/04C01P2004/64C01P2004/80
Inventor 李晓杰严仙荣王小红闫鸿浩王宇新孙明
Owner DALIAN UNIV OF TECH
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