Metal nanoparticles are a widely used material that can be applied in various fields, such as medicine, electronics, energy, and the environment. They have extremely small size and high surface area, which can enhance the performance of many materials. However, the surface of metal nanoparticles is often very active and easily reacts with the surrounding environment, so a passivation layer is need...
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Class I and Class II materials are two fundamental concepts in the field of materials science, which are used to describe the crystal structure types of materials and are often applied in the research of materials such as semiconductors and metals. So, how do we distinguish between Class I materials and Class II materials? A simple method is to distinguish based on the density of the material. Com...
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Ultra fine silicon carbide powder is an excellent inorganic material with excellent characteristics such as high chemical inertness, high hardness, and high melting point, making it widely used in the manufacturing industry. However, due to its low surface activity, it is difficult to achieve its excellent performance in certain industrial application scenarios. Therefore, the study of surface mod...
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In recent years, there has been a trend of oil-based lubricants being replaced by water-based lubricants. Boron nitride coatings are often used in forging nickel based alloys, high melting point alloys, and titanium machined parts, which not only provide lubrication but also prevent workpiece oxidation. Characteristics that forging lubricants should possess 1. Evenly moisten the surface to prevent...
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What is boron carbide powder? Nano boron carbide and ultrafine boron carbide powder were prepared by variable current laser ion vapor phase method. Boron carbide, also known as black diamond, has a molecular formula of B4C and is usually a gray black micro powder. It is one of the three hardest materials known (the other two being diamond and cubic boron nitride). Hard black glossy crystal. The ha...
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The sintering of materials involves at least two processes: densification of the body and growth of grains in the body. The longevity of grains is usually achieved through the movement of grain boundaries. According to the classical theory of grain growth kinetics, the difference in free energy between the two sides of a curved grain boundary is the driving force that causes the interface to move ...
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XRD is an important means of characterizing phases. Strictly speaking, it can determine the existence of a certain phase, but cannot determine the absence of a certain phase, making it easier to distinguish between truth and falsehood. So, what is its detection limit? Firstly, we must emphasize that XRD analysis of elemental content is very inaccurate. If we have to say what the detection limit is...
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Powder surface modification changes the surface state of particles through physical or chemical means, with the core being to break the agglomeration force between particles. When the particle size of the powder decreases to the micrometer or nanometer level, the surface energy sharply increases, and van der Waals forces, hydrogen bonds, and other gravitational forces cause the particles to sponta...
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