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Preparation method for iron/aluminum intermetallic compound and ZrO2 multiphase material cell phone ceramic back board

A technology of intermetallic compounds and ceramic backplanes, applied in the structure of telephones, etc., can solve the problems of high cost of low-speed machining, low yield of high-speed machining, and difficulty in large-scale application, so as to optimize mechanical properties and reduce residual stress The effect of releasing cracking and improving the toughening effect

Active Publication Date: 2017-07-14
安徽通湾科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the current metal casing and other structural parts, it is still low, resulting in the following problems: 1) The degree of drop resistance is still not good; 2) The yield rate of high-speed machining is low, and the cost of low-speed machining is high
In addition, yttrium partially stabilized zirconia has a phase change aging phenomenon, and repeated bumps and drastic temperature changes during use may lead to failure of structural parts. At the same time, the high cost of raw materials for the preparation of yttrium partially stabilized zirconia ceramics is also a problem that limits its large-scale application.

Method used

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  • Preparation method for iron/aluminum intermetallic compound and ZrO2 multiphase material cell phone ceramic back board

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preparation example Construction

[0024] The present invention is described in further detail below: a kind of iron-aluminum intermetallic compound and ZrO 2 A method for preparing a mobile phone ceramic backplane made of a composite phase material, comprising the following steps:

[0025] a) Mole percentage Fe: Al=(71-77): (23-29) Weigh iron powder and aluminum powder to smelt the alloy, and spray under high pressure in an inert atmosphere to prepare iron-aluminum intermetallic compound powder;

[0026] b) weighing the yttrium-stabilized zirconia powder and the iron-aluminum intermetallic compound powder obtained in step a) into a grinding jar according to the weight ratio (60-90): (10-40), using alcohol or water as the grinding medium, Grinding for 18-24 hours to obtain mixed grinding powder;

[0027] c) high-energy ball milling the mixed grinding powder obtained in step b) for 3h to 5h;

[0028] d) granulating the mixed grinding powder treated in step c) to obtain granulated powder;

[0029] e) subjectin...

Embodiment 1

[0043] Calculated on the basis of 10kg of alloy ingredients, weigh iron powder and aluminum powder according to the molar percentage Fe:Al=71:29 and add them to the vacuum melting furnace, heat up to 1300°C for 2 hours to obtain iron-aluminum metal liquid, and drain it to an air pressure of 0.3MPa Ar gas atmosphere spraying prilling tower cooling powder to obtain iron-aluminum intermetallic compound powder.

[0044]Calculated on the basis of 3kg of alloy ingredients, weigh yttria-stabilized zirconia powder and iron-aluminum intermetallic compound powder into the grinding tank at a weight ratio of 60:40, use alcohol as the grinding medium, and grind for 24 hours to obtain a mixed grinding powder. The mixed and ground powder was high-energy ball milled again for 3 hours, then dried and ground by manual addition of paraffin wax binder, and closed spray granulation with nitrogen protection to obtain granulated powder. Put the granulation powder into the mold and dry press it to de...

Embodiment 2

[0048] Calculated on the basis of 15kg of alloy ingredients, weigh iron powder and aluminum powder according to the molar percentage Fe:Al=77:23 and add them to the vacuum melting furnace, heat up to 1350°C for 1.5 hours to obtain iron-aluminum metal liquid, and drain it to a pressure of 0.5 The Ar gas atmosphere of MPa is sprayed in a prilling tower to cool and make powder to obtain iron-aluminum intermetallic compound powder.

[0049] Calculated on the basis of a 30kg alloy batching, the magnesia-stabilized zirconia powder and the iron-aluminum intermetallic compound powder are weighed into the grinding tank at a weight ratio of 90:10, and water is used as the grinding medium to grind for 18 hours to obtain a mixed grinding powder. The mixed milled powder was high-energy ball milled again for 5 hours, and then a polyvinyl alcohol binder was added to spray and granulate to obtain granulated powder. Put the granulation powder into the mold and then dry press it to demould, and...

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Abstract

The invention discloses a preparation method for an iron / aluminum intermetallic compound and ZrO2 multiphase material cell phone ceramic back board. The method includes the steps of blending and grinding a Fe3Al intermetallic compound with ZrO2, and granulating and sintering the blended material to prepare a multiphase material. According to the method, the composite material utilizes the character of equal linear expansion coefficient of the Fe3Al intermetallic compound and ZrO2 with combination of excellent fracture toughness of the Fe3Al intermetallic compound and high bending strength and high hardness of the ZrO2, wherein excessive metal can serve as a sintering aid, so that the composite material can be compacted in a normal pressure sintering furnace. The sintering aid can fill up the microscopic defects, such as pores, cracks and the like, in the multiphase material, thus optimizing mechanical performance. A sectional temperature-decreasing cooling process can preserve a ZrO2 high-temperature phase in the multiphase material until room temperature, thus improving toughening effect and solving a problem of cracking due to release of residual stress during the cooling process of the multiphase material. The method increases yield of the sintered ceramic, and reduces the usage amount of ZrO2 in the multiphase material and further reduces comprehensive cost of the ceramic back board.

Description

technical field [0001] The invention relates to the field of preparation of structural ceramics, in particular to an iron-aluminum intermetallic compound and ZrO 2 The invention relates to a preparation method of a mobile phone ceramic back plate made of a composite phase material. Background technique [0002] In recent years, with the rapid development of consumer electronics such as mobile phones, structural parts such as mobile phone backplanes have made remarkable progress. Especially driven by the design requirements of consumer electronic backplanes in the future 5G era, traditional metal casings and plastic casings are difficult to meet consumer demand, so new materials and preparation processes are urgently needed. [0003] Due to ZrO 2 Ceramics have high toughness, good hardness, and high wear resistance, and are widely used in the fields of structural ceramics and functional ceramics. It has also been reported that partially stabilized zirconia (TZP) can be use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622H04M1/02
Inventor 周涛沈同德
Owner 安徽通湾科技有限公司
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