Fisher's method is a relatively simple particle size measurement method, which is based on measuring the speed of air passing through the powder accumulation, and then obtaining the average particle size of the powder according to the Kozeny-Carman formula. However, the Fisher method is a relative measurement method, which cannot accurately determine the true particle size of the powder, and is on...
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This is a method of synthesizing boron nitride by reacting borax and ammonium chloride as the main raw materials in an ammonia atmosphere. The two raw materials should be dehydrated and recrystallized separately before participating in the reaction. Borax is best dehydrated in a vacuum at 200~400°C. The recrystallization of ammonium chloride is to dissolve it into a saturated solution, filter to r...
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The synthesis of boron nitride by nitridation with boron anhydride (B4O3) is one of the important methods for industrial production of boron nitride. Due to the low melting point of boron anhydride (glass state is 294°C, crystalline state is 450-600°C), it becomes a high-viscosity melt at the nitriding temperature, which hinders the flow of ammonia and makes the reaction slow and extremely incompl...
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Boron carbide, also known as black diamond, is an inorganic substance with a chemical formula of B4C, usually a gray-black micropowder. It is one of the three hardest known materials (after diamond and cubic boron nitride) and is used in tank armor, body armor and many industrial applications. Several preparation methods of nano-boron carbide (supply 100-200nm): 1. Carbothermal reduction method Be...
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The preparation methods of CNTS loaded metal nanoparticles are mainly physical preparation and chemical preparation methods. The most commonly used is chemical preparation method. The chemical preparation method is generally uniformly loaded with metal nanoparticles on the carrier CNTS. The general process of chemical preparation is that the metal front drive is restored to atoms, and the metal at...
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The surface coating treatment of ultrafine powder is a very useful technology, which can improve the flow performance of the powder, reduce dust flying, improve stability and moisture resistance, and enhance the solubility of the powder. The commonly used surface coating treatment methods for ultrafine powders include the following: Wet surface treatment: The coating material is added in liquid fo...
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Introduction: Nanotechnology is becoming increasingly important in many fields, from medicine to electronics. Nanomaterials, including nanoparticles, nanotubes, and nanowires, are essential components of many nanotechnology applications. Producing these materials requires specialized techniques, such as wet and dry methods. In this article, we will explore what dry and wet methods are, their benef...
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