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Annealing method of ceramic rear cover

A ceramic and annealing technology, applied in the direction of telephone structure, telephone communication, electrical components, etc., can solve the problems of difficult assembly of components, low yield of finished products, concentration of internal stress, etc., and achieve high-quality mechanical properties, uniform distribution, and stress relief. Effect

Inactive Publication Date: 2018-02-16
湖北天宝光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of serious product warping, concentrated internal stress, difficulty in assembling the ceramic shell and other components of the mobile phone, and low yield of finished products in the prior art, the present invention provides an annealing method for a ceramic back cover, which includes the following steps:

Method used

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  • Annealing method of ceramic rear cover
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Effect test

Embodiment 1

[0036] A method for annealing a ceramic back cover provided in this embodiment includes the following steps:

[0037] Step 1: Put the ceramic back cover into the annealing furnace, press a ceramic counterweight on the upper side of the inner cavity of the ceramic back cover, the pressure provided by the ceramic counterweight is 7N / cm; the temperature of the annealing furnace is raised from normal temperature to 760 In the medium temperature zone of ℃, the heating time is 210min, the heating rate is 3.6℃ / min, and the temperature is kept in the medium temperature zone for 1 hour;

[0038] Step 2: After heat preservation in the medium-temperature area, heat up to a high-temperature area with a temperature of 1160°C at a heating rate of 3.6°C / min, and keep warm in the high-temperature area for 3 hours;

[0039] Step 3: After completing the high-temperature heat preservation, cool down to 900°C, and control the cooling rate at 3.6°C / min;

[0040] Step 4: naturally cool to room tem...

Embodiment 2

[0043] A method for annealing a ceramic back cover provided in this embodiment includes the following steps:

[0044] Step 1: Put the ceramic back cover into the annealing furnace, press a ceramic counterweight on the upper side of the inner cavity of the ceramic back cover, the pressure provided by the ceramic counterweight is 7N / cm; the temperature of the annealing furnace is raised from normal temperature to 600 In the medium temperature zone of ℃, the heating time is 210min, the heating rate is 2.8℃ / min, and the temperature is kept in the medium temperature zone for 2 hours;

[0045] Step 2: After heat preservation in the medium-temperature area, heat up to a high-temperature area with a temperature of 1000°C at a heating rate of 3.6°C / min, and keep warm in the high-temperature area for 4 hours;

[0046] Step 3: After completing the high-temperature heat preservation, cool down to 900°C, and control the cooling rate at 3.6°C / min;

[0047] Step 4: naturally cool to room te...

Embodiment 3

[0050] A method for annealing a ceramic back cover provided in this embodiment includes the following steps:

[0051] Step 1: Put the ceramic back cover into the annealing furnace, press a ceramic counterweight on the side of the inner cavity of the ceramic back cover, the pressure provided by the ceramic counterweight is 7N / cm; the temperature of the annealing furnace is raised from normal temperature to 800 In the medium temperature zone of ℃, the heating time is 210min, the heating rate is 3.8℃ / min, and the temperature is kept in the medium temperature zone for 1 hour;

[0052] Step 2: After heat preservation in the medium-temperature area, heat up to a high-temperature area with a temperature of 1200°C at a heating rate of 3.6°C / min, and keep warm in the high-temperature area for 3 hours;

[0053] Step 3: After completing the high-temperature heat preservation, cool down to 900°C, and control the cooling rate at 3.6°C / min;

[0054] Step 4: naturally cool to room temperatu...

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Abstract

The invention discloses an annealing method of a ceramic rear cover, and belongs to the field of ceramic rear cover machining. The method comprises the following steps: putting the ceramic rear coverinto an annealing furnace, rising the temperature to a 600 to 800 DEG C medium temperature zone, and performing heat preservation for 1 to 2 hours; rising the temperature to a 1000 to 1200 high temperature zone after heat preservation is performed in the medium temperature zone, and performing heat preservation for 3 to 4 hours in the high temperature zone; reducing the temperature to 800 to 900 DEG C after high temperature preservation is performed, and ensuring that the time is controlled to be 1 to 2 hours; naturally cooling the ceramic rear cover to the room temperature, and then discharging the ceramic rear cover, so as to accomplish annealing. The method has the benefits that a gradient temperature rising and reducing technology is adopted; through twice time rise and twice temperature reduction, the ceramic rear cover is kept in the two temperature zones for a certain period of time, then crystal particles inside the ceramic rear cover are grown by stages, interaction force among the crystal particles is fully released, the crystal particles are more uniformly distributed, and an arrangement structure among the crystal particles is more stable, so that stress produced duringfine carving of the ceramic rear cover is effectively reduced, the fact that the deformation of the ceramic rear cover is below 0.08mm after annealing treatment is ensured, and the assembly requirement of mobile phones is met.

Description

technical field [0001] The invention relates to the field of ceramic back cover processing, in particular to an annealing method for a ceramic back cover. Background technique [0002] With the 5G era of communication, smartphones will completely abandon the existing metal back cover frame, and use ceramic materials that will not shield signals. As an indispensable part of future mobile phone equipment, the ceramic mobile phone middle frame needs to be improved in processing efficiency and quality. [0003] After the ceramic material is processed by CNC, a certain processing stress will be generated. This stress will accumulate on the ceramic surface and affect the warping degree of the ceramic sheet. Severe warping will produce fragments in the subsequent processing process and affect the product quality of the entire processing cycle. The concentration of internal stress will also lead to deformation of the central part, making it difficult to assemble the ceramic shell w...

Claims

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Application Information

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IPC IPC(8): C04B41/80C04B41/85H04M1/02
CPCC04B41/0072C04B41/5045C04B41/80C04B41/85H04M1/026C04B41/4549
Inventor 黎锦林
Owner 湖北天宝光电科技有限公司
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