无码一区二区三区,欧美午夜理伦三级在线观看,男ji大巴进入女人的视频,欧美日韩在线视频

As a basic material in the semiconductor industry and photovoltaic field, the quality of monocrystalline silicon directly determines the performance and efficiency of downstream products. As an important high-temperature container in the monocrystalline silicon growth furnace, tungsten crucible plays the role of bearing and heat transfer of molten silicon, and its performance has a decisive impact on the stability and crystal quality of the crystal growth process. However, its application faces a number of key technical challenges, which require in-depth…

In the actual use process, tungsten crucibles often face the risk of crack formation, which not only affects its service life, but also directly affects the stability of the process and product quality. Therefore, how to effectively prevent the formation of cracks has become the focus of the industry. In this paper, we will systematically discuss the strategies to prevent crucible cracks from the aspects of material selection, processing technology, use environment and operating procedures. First and foremost, material purity…

Tungsten crucible plays an important role in the process of crystal growth, such as bearing molten raw materials, high-temperature heat transfer and environmental isolation, and its reasonable design directly affects the quality, yield and stability of the whole process. Therefore, it is of great significance to carry out the optimal design of the crucible according to the special working conditions of the crystal growth furnace. First of all, the geometry of the crucible needs to be designed with the melt…

Tungsten crucible is widely used in high-temperature vacuum processes such as crystal growth, rare metal smelting and vacuum evaporation due to its high temperature resistance, thermal shock resistance and strong chemical inertness. This paper focuses on the stability performance and influencing factors of crucibles in high-temperature vacuum environment, aiming to provide theoretical support and practical reference for the design and operation of related high-temperature equipment. First of all, the chemical stability of W crucible in vacuum is significantly better than…

As an indispensable key material in the high-temperature industry, the performance of tungsten crucible directly affects the production efficiency and product quality in many fields such as crystal growth, metal melting and vacuum evaporation. Among the many performance indicators, the purity level of tungsten material not only determines the physical properties of the crucible, but also has a profound impact on its chemical stability, mechanical strength and service life. First of all, the material purity of tungsten is directly related…

Tungsten crucibles are widely used in crystal growth, metal smelting and vacuum evaporation processes. However, in the high-temperature oxidation environment, its performance has certain particularities and limitations, which has become an important issue that must be paid attention to in its practical application. In air or oxygenated atmosphere, when the temperature exceeds 400°C, the tungsten surface begins to oxidize to form tungsten trioxide (WO?). As the temperature rises further, this oxide gradually forms a brittle oxide film on the surface…

Although tungsten itself has excellent thermal stability and corrosion resistance, the actual service life of tungsten crucibles is affected by a number of factors. Therefore, a lifetime assessment of the system not only helps to improve the efficiency of equipment operation, but also reduces material waste and maintenance costs. The main factors affecting the life of tungsten crucibles include temperature conditions, working atmosphere, frequency of use, type of smelted material, processing quality and number of thermal cycles. Temperature plays a…

Tungsten crucible is one of the typical applications of tungsten material, in addition to the performance of the material itself, the influence of machining accuracy on the final performance of the crucible can not be ignored, especially in the context of increasingly strict requirements for high-precision manufacturing and thermal field control, processing quality has become one of the key factors to evaluate the reliability and practicability of the crucible. First of all, machining accuracy is directly related to the accuracy…

As an important part of the process of carrying molten metal, crystal growth, high-temperature evaporation, etc., tungsten crucible must not only have excellent high-temperature stability and chemical inertness, but also have good heat transfer performance to ensure the thermal efficiency of the process and the uniformity of temperature control. The intrinsic thermal conductivity of tungsten is about 170 W/(m·K) at room temperature, which is among the highest among all metallic materials, which means that it has an extremely strong ability…

Tungsten crucibles are widely used in sapphire crystal growth, rare metal smelting, high-temperature material testing and other fields due to their excellent high-temperature stability and corrosion resistance. In these applications, thermal conductivity, as an important physical parameter to measure the heat transfer ability of materials, directly affects the temperature field distribution, thermal stress development and overall thermal management performance of the crucible, so it is of great significance to systematically analyze the thermal conductivity of the W crucible. The thermal…