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Design principles for metallization formulations of ceramic substrates

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  Ceramic metallization is a very important process skill of ceramics. The metal sealing technology of ceramic substrates is composed and developed by scientific interspersion. It is the use and extension of materials. It is a highly technical and practical substrate. skill. Today, DPC Ceramics Xiaobian mainly shares the “Guidelines for the Planning of Metallic Formulations for Ceramic Substrates”.

DPC ceramic

  DBC ceramic substrate

  The metallization planning guidelines for ceramic substrates are inseparable from the packaging principle. The main mechanism of the activated Mo-Mn method widely used at home and abroad is the relocation of the activator glass phase. Due to the development and extensive use of XPS and AES in the 1980s, people first selected the above-mentioned modern external profiling skills to analyze and determine the chemical state of the metallized layer Mo. It was found that the appearance of the metal Mo is not a simple metal. An oxide film of about 200 nm thick is formed during the metallization. This oxide film is very important for the airtightness and strength of the sealing component. Therefore, the chemical state of Mo's external oxidation is an important part of the mechanism of the activated Mo-Mn process.

  The component of the metallization formulation of the ceramic substrate proposes the concept of “three elements”, that is, SiO2, aluminum oxide and MnO should generally exist in the general metallization formula. Due to the existence of the external oxidation state of Mo, the explanation and research sealing is very It is important. For example, this can explain the importance and materialization meaning of the introduction of SiO2 in the general Mo-Mn method. It has been proved that the presence of SiO2 improves the moisturization of the glass phase and the Mo particles, the probability of fracture from the metallization layer is reduced, and the sealing strength is correspondingly improved. Therefore, it is preferable to select a wet hydrogen atmosphere, which is not only a requirement for Mn to become MnO, but also a demand for an oxide film of MoO2. In particular, the single bond strength of SiO2 is 444KJ/mol, which is a glass structure and a matrix and skeleton of the activator. It is similar to MoO2 in chemical properties, which is beneficial to moisture, and its importance is evident.

  Metallization of ceramic substrate in the introduction of MnO into the metallization formula, its obvious effects are three kinds: 1, as a binder, can produce chemical reaction with some metals, so that the sealing strength is improved; 2, lowering the high temperature viscosity of the glass, making the metal The temperature is lowered; 3, the surface tension of the glass is lowered and the ability of the glass melt to moisturize the metal surface is increased.

  In short, the sealing mechanism involved includes material structure, chemical thermodynamics and chemical kinetics. This is the main content of physical chemistry. Therefore, it can be considered that the mechanism of activation of Mo-Mn is a physicochemical reaction mechanism. From this mechanism, it was confirmed that the three main components of the general formulation were aluminum oxide, SiO2 and MnO. Among them, the effect of Al2O3 is mainly to improve the sealing strength, while SiO2 and MnO are mainly used to improve the moisturizing and lowering viscosity.

  In summary, the metallization of ceramic substrates should consider the concept of “three elements” in terms of formula composition planning. In terms of two functions, the expansion coefficient, solubility, moisturization characteristics of the activator glass phase should be considered, and more ceramic metallization Questions can be consulted with DPC Ceramics.
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