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Magnetism is the basic property of matter as well as force, heat, electricity and light. Materials with ferromagnetism are usually called magnetic materials. The biggest characteristic of magnetic materials is the hysteresis behavior, that is, the magnetization M changes with the external magnetic field. When H returns from a certain state to zero, M still maintains a certain size. Only when the magnetic field is applied in the opposite direction M drops to zero, so that the reciprocal change of M with H is a loop instead of a single curve. Figure 1-1 shows a schematic diagram of a typical hysteresis loop. The main parameters describing the characteristics of the hysteresis loop are: (1) Residual magnetic induction Br, (or residual magnetic polarization Jr=AMr) (remanent magnetism for short) is the magnetic flux density when the magnetic field H=0 in the magnet; (2) The coercive force HcB (or intrinsic coercive force HcJ) is the reverse magnetic field H necessary for the magnetic...

The production efficiency of boron nitride produced by chemical vapor deposition is high, but this method is easy to introduce pores and impurities into the sintered body and anisotropy caused by hot pressing. This makes its application very limited, especially in high temperature and oxidizing environments. Pyrolytic boron nitride materials have excellent physical and chemical properties. Chemical vapor deposition (CVD) is an ideal choice for the preparation of high-purity and dense boron oxide materials. The structure, morphology and properties of the prepared pyrolytic boron nitride (PBN) may depend to a large extent on the process conditions. Most boron nitride prepared by chemical vapor deposition (CVD) is thin film, powder, etc., while bulk boron nitride is limited to highly anisotropic pyrolytic boron nitride, which cannot fully utilize the characteristics of structural diversity. The synthesis of boron nitride limits its application in a wider field. Therefore, there are relat...

Pyrolytic boron nitride is an anisotropic high-temperature ceramic with high electrical resistance and good thermal conductivity. It is suitable for applications requiring high strength, low thermal expansion coefficient and good thermal shock resistance. Pyrolytic boron nitride also has thermal shock resistance and is a superior sealant that protects graphite from corrosive environments, such as most molten metals, acids, and hot ammonia environments. It has been verified that pyrolytic boron nitride is also a very effective insulating material. Pyrolytic boron nitride is non-toxic and harmless under normal conditions, has no porosity, and has high purity, so it is easy to store and easy to process into crucibles, evaporation boats, plates, pipes, bottles and other utensils. Pyrolytic Boron Nitride (PBN) belongs to the hexagonal crystal system. It is an advanced ceramic material with a purity of 99.999%, acid and alkali resistance, oxidation resistance, good thermal conductivity, co...

Advanced ceramics can be divided into structural ceramics, tool ceramics, and functional ceramics according to their different uses. Structural Ceramics The main materials of structural ceramics are alumina (Al2O3), silicon nitride (Si3N4), silicon carbide (SiC), and hexagon boron nitride ceramics (BN). Alumina (Al2O3) The main composition is Al2O3, and the general content is more than 45%. Alumina ceramics have various excellent properties such as high-temperature resistance, corrosion resistance and high strength, which is 2~3 ordinary ceramics. However, alumina ceramics have the disadvantage of being brittle and unable to accept sudden changes in ambient temperature. Alumina ceramics are widely used as the crucible, engine spark plug, high-temperature refractory, thermocouple sleeve, sealing ring and so on. Silicon nitride (Si3N4) ceramics Si3N4 is the main component of silicon nitride ceramics, which is a kind of high-temperature ceramics with high strength, high hardness, abrasio...

Titanium nickel alloy, also known as Nitinol, is a binary alloy composed of nickel and titanium. The atomic percentages of these two elements are approximately equal. Austenitic phase and martensite phase Due to changes in temperature and mechanical pressure, Nitinol has two different crystal structure phases, namely an austenite phase and a martensite phase. In Nitinol, austenite is called the mother phase, which is the crystalline phase of the alloy at high temperatures. When the temperature decreases, austenite will gradually transform into martensite (child phase). Two characteristics of Nitinol -Shape memory When the mother phase of a certain shape cools from above the Af temperature to below the Mf temperature and completely forms martensite, shape memory occurs, thereby deforming the martensite below the Mf temperature. After heating below the Af temperature, the material will automatically recover its parent phase shape by reverse phase transition. In fact, the shape memory ef...

Nitinol (Nitinol) alloys have many material and device characteristics, for example, kinking resistance, stress constancy, dynamic interference, deflection stiffness, magnetic resonance imaging (MR1) compatibility, radiopacity and biocompatibility. The most famous characteristics of Nitinol are its superelasticity and thermal shape memory. Although the term "shape memory" describes the phenomenon of restoring a predetermined shape by hearing and deforming the shape "plastically", the term "superelasticity" refers to the great elasticity of these alloys, which can be 10 times greater than the best stainless steel. Steel used in medicine today. Although both effects are spectacular, they are not the only important properties of the material. Nitinol has two characteristics: shape memory effect (SME) and superelasticity (SE). Shape memory Shape memory happens when mother phase of a certain shape is cooled from above the Af temperature to below the Mf tempera...

Tungsten is an incredibly useful element that has been used extensively over the years in various manufacturing processes. It's extremely hard, heat-resistant, and corrosion-resistant, so it can be fashioned into a variety of shapes for many industrial uses. In this article, we'll discuss some of the innovative ways tungsten is being used in tube manufacturing today and its potential applications as well. From its history to advances in production methods, you will gain a better understanding of how beneficial tungsten tubes are becoming for businesses and industries around the world. So whether you are in search of a reliable partner to fabricate your next project or just want to explore more about how manufacturers are incorporating tungsten metal into new technology - read on and learn all there is to know about this incredible material! Cutting-edge technologies in Tungsten Tube Production The world of manufacturing is constantly evolving, and as technology advances, so d...