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A nanoparticle, boron carbide technology, applied in chemical instruments and methods, carbon compounds, nanotechnology, etc., can solve the problems of large particle size, high energy consumption, low product purity, etc., and achieve uniform particle size, low energy consumption, and high purity. Effect
Active Publication Date: 2021-03-30
HARBIN INST OF TECH
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[0004] The purpose of the present invention is to provide a method for preparing boron carbide nanoparticles in order to solve the problems of lar
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specific Embodiment approach 1
[0021] Specific embodiment one: present embodiment a kind of preparation method of boron carbide nanoparticles, it is realized according to the following steps:
[0022] 1. Weigh the boron source, carbon source and additives according to the molar ratio (1~10):1:(0.001~0.1), and mix them to obtain mixture A;
[0023] 2. According to the mass volume ratio of 1g: (5-1000) mL, ultrasonically dissolve the mixture A in the solvent to obtain the slurry B;
[0024] 3. Place the obtained slurry B in an HCl atmosphere, heat and dry at 30-300°C for 0.2-24 hours to obtain a dry mixture C;
[0025] 4. Put the dry mixture C in a graphite crucible, heat it to 700-1700° C. in a high-temperature furnace under an inert atmosphere and keep it warm for 0.1-6 hours, and obtain boron carbide powder after cooling in the furnace, that is, complete the preparation of boron carbide nanoparticles;
[0026] Wherein the boron source in step 1 is crystalline boron, ammonium fluoroborate, boric acid, meta...
specific Embodiment approach 2
[0030] Embodiment 2: This embodiment differs from Embodiment 1 in that in step 1, the boron source, carbon source and additives are weighed according to the molar ratio (2-8):1:(0.002-0.08). Other steps and parameters are the same as those in Embodiment 1.
specific Embodiment approach 3
[0031] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 1, the boron source, carbon source and additives are weighed according to the molar ratio of 5:1:0.05. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.
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Abstract
The invention discloses a preparation method of boron carbide nanoparticles, belongs to the field of new materials, and aims to solve the problems of high energy consumption, environmental pollution,high cost, low product purity and large particle size in the existing preparation of boron carbide. The method comprises the following steps: 1, mixing a boron source, a carbon source and an additiveto obtain a mixture; 2, preparing slurry; 3, heating and drying the slurry in an HCl atmosphere to obtain a dry mixture; and 4, heating the dried mixture in an inert atmosphere to obtain the boron carbide powder. The boron carbide particles prepared by adopting the method have the advantages of nanoscale, uniform particle size, high purity, low energy consumption in preparation, no environmental pollution and low cost, and can be industrially produced in batches. A uniform mixture is formed under the cavitation action of ultrasonic waves. Under the action of a shape regulator MgCl2, the growthprocess of boron carbide is effectively controlled, and the preparation of nanoscale particles is realized. The size of the generated boron carbide particles can be regulated and controlled accordingto the ratio of reactants and the addition amount of the shape regulator. The preparation method is applied to preparation of the nano boron carbide particles.
Description
technical field [0001] The invention belongs to the field of new materials, and in particular relates to a preparation method of boron carbide nanoparticles. Background technique [0002] Boron carbide was first discovered in 1858, and its stoichiometric molecular formula is B 4 The compound of C was not recognized until 1934. Due to the nature of its covalent bond, boron carbide has a high melting point, high hardness, good wear resistance, acid and alkali corrosion resistance, low density, and high thermal neutron absorption capacity. Its hardness is second only to diamond and cubic boron nitride. It is a non-metallic material with important physical and chemical properties. Boron carbide has the properties of high temperature and extraordinary hardness, and is widely used in fields such as body armor and abrasive appliances. Boron carbide is the lightest ceramic material. Because of its low density, it can be used as jet blades, and it is widely used in the field of ae...
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