High-solid-content crystal combination porcelain feed and preparation method thereof

Abstract

The invention provides a high-solid-content crystal combination porcelain feed and a preparation method thereof, and the feed comprises the following components in parts by weight: 25-32.5 parts of inorganic powder with a first particle size, 25-32.5 parts of inorganic powder with a second particle size and 35-50 parts of organic polymer resin, wherein the ratio of the size of the inorganic powder with the first particle size to the size of the inorganic powder with the second particle size is greater than 5.6. Compared with an inorganic powder feed with a single particle size, the feed realizes that the filling weight ratio of the inorganic powder in the feed is greater than 50% and the inorganic powder has good fluidity by limiting the matching of the inorganic powder with different sizes. By utilizing the difference of the flowability of the inorganic powder with different sizes in the feeding process, the gradient distribution of the inorganic powder with large particle size and the inorganic powder with small particle size is realized in the injection molding process, and the technical effect of'tough inside and hard outside 'of the appearance structural member of the crystal combination porcelain can be realized; the method can be used for preparing mobile phone shells, middle frames, integrated mobile phone shell middle frames, watch rear covers and middle frames.

Description

technical field [0001] The invention relates to the technical field of structural parts and their preparation, in particular to the field of preparation of consumer electronic shell structural parts, in particular to a high-solid-content composite crystal ceramic feed and a preparation method thereof, and a composite crystal ceramic appearance structural part. Background technique [0002] With the rapid development of consumer electronics such as mobile phones, the structural components such as the backplane (casing) of consumer electronics have made great progress, but also encountered new problems. In particular, in the future 5G era, more stringent requirements are placed on the material of the consumer electronics backplane (casing). Due to its shielding effect, traditional metal poses a huge challenge to antenna design, and it will not be used in the manufacture of 5G backplanes (housings). Applications in thin fields, and with the improvement of consumer aesthetics, ...

AI Technical Summary

Problems solved by technology

Due to its shielding effect, traditional metal poses a huge challenge to antenna design. It will not be used in the manufacture of 5G backplanes (housings), while plastics are inherently low-strength and non-wear-resistant, which limits their use in large-size screens, ultra- In addition, with the improvement of consumer aesthetics, the traditional single metal shell and plastic backplane (shell) will also be difficult to impress consumers.

[0003] In the patent application number 201510940002.3, it is reported that the method of injection molding and sintering the zirconia powder and the binder to obtain the feed is used to prepare the mobile phone shell in the field of consumer electronics. This scheme uses ZrO 2 Ceramics have the characteristics of good hardness and high wear resistance, but the preparation of mobile phone casings also has the following disadvantages: 1) the fracture toughness of ceramics is still far lower than that of metal and plastic parts, and large-scale impact resistance such as the prepared mobile phone backplane (shell) Poor drop performance, easy to break; 2) ZrO 2 The density of ceramics is as high as 6.1g / cm 3 , the quality of the large-sized parts of the back plate of the mobile phone (housing) is heavy, which is not conducive to the development of thinner and lighter consumer electronics; 3) the color of the ceramic case is single, and if a small amount of colorant is added during the firing process, the quality of the parts will also be deteriorated. Mechanical properties, resulting in monotonous color of the ceramic (housing) backplane

[0004] On the other hand, the Mohs hardness of pure zirconia ceramics is close to 9, which is second only to diamond, resulting in low cutting volume, small amount of cutting, difficult processing and long processing time in the grinding and polishing process. Only the machining cost of zirconia ceramic back cover It accounts for 2 / 3 of the entire production cost, and the processing process is easy to break, and the yield rate is low

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