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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 poor, so it is more necessary to study methods to improve its thermal stability to promote the application of nano-diamond

Method used

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  • Nano-diamond surface boronation method

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Experimental program
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Effect test

Embodiment 1

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

[0030] Such as figure 1 XRD patterns of nano-diamond raw material and boronized nano-diamond, respectively. It can be seen from the figure that the original nano-diamond crystal form is a single cubic diamond (as shown in curve 1), and the borided nano-diamond contains a small amo...

Embodiment 2

[0034] Take 5g of nano-diamond, press B:C=5~100%, and the mass is 2.381~47.625g Na 2 B 4 o 7 10H 2 O water and liquid are mixed evenly, dried at 450°C, moved to a high-temperature sintering furnace, heated to 880-1100°C in hydrogen, and kept at a constant temperature for 20-120min. The product is taken out, washed with water, dried, and granulated to obtain boron similar to Example 1. Nanodiamonds.

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

Embodiment 3

[0037] Take 5g of nano-diamond, according to B:C=5~100%, mix it with 1.525~30.5g of boric acid aqueous solution evenly, evaporate excess water in a horse boiling furnace at 450°C, move it to a high-temperature sintering furnace, and heat it to 500~1100°C under nitrogen protection. The temperature was kept constant for 20-120 minutes, and the product was taken out, washed with water, dried, and granulated to obtain boride nano-diamond similar to Example 1.

[0038] Partial physical and chemical properties of boric acid: Heating to 70-100°C gradually dehydrates to generate metaboric acid, generates pyroboric acid at 150-160°C, generates boric anhydride (boron trioxide) at 300°C, and boric anhydride (boron oxide) is in a molten state at 450°C , 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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