Method for low-temperature rapid sintering of alumina-based transparent ceramics with high thermal conductivity through hot pressing

A high thermal conductivity, alumina-based technology, applied in the field of low-temperature hot pressing and rapid sintering of high-thermal conductivity alumina-based transparent ceramics, can solve the problems of insufficient heat dissipation, LED grain interface affecting luminous efficiency and luminous life, etc. Achieve good performance and effect, solve the effect of high sintering temperature and reduce sintering temperature

Inactive Publication Date: 2012-08-08
GUANGDONG UNIV OF TECH
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Problems solved by technology

However, as high-power LEDs become more and more popular, this board is not enough to meet the heat dissipation requirements. Only 15 to 20% of the input power of high-power LEDs is converted into light, and the remaining 8

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  • Method for low-temperature rapid sintering of alumina-based transparent ceramics with high thermal conductivity through hot pressing
  • Method for low-temperature rapid sintering of alumina-based transparent ceramics with high thermal conductivity through hot pressing
  • Method for low-temperature rapid sintering of alumina-based transparent ceramics with high thermal conductivity through hot pressing

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[0010] The following examples further illustrate the essential features and significant advantages of the present invention.

[0011] According to alumina + (silica lithium carbonate) [Al 2 O 3 +(0.4mol%SiO 2 0.4mol% Li 2 CO 3 )] Proportion. A ceramic with a molar ratio of alumina: silica: lithium carbonate = 0.992:0.004:0.004 was synthesized by hot pressing. First, use alumina as the raw material of the main formula, weigh and proportion according to the formula, mix the materials, pulverize with a planetary ball mill, and dry, then carry out the second batching, and add the sintering aids lithium carbonate and silica according to the above proportion , Then use a planetary ball mill to pulverize and add glue, and then use a DC fast hot-press sintering machine to sinter at 1370℃ for 2 minutes and press 3t at the same time to sinter, then grind the sintered sample, and then perform performance testing and measurement Its thermal conductivity can be seen in Table 1 that its therm...

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Abstract

The invention discloses a method for low-temperature rapid sintering of alumina-based transparent ceramics with high thermal conductivity through hot pressing. The method takes alumina as raw materials, employs silicon dioxide and lithium carbonate as sintering aids, and uses a spark plasma sintering method to prepare alumina-based transparent ceramics with high thermal conductivity. Compared with traditional alumina ceramics, the alumina-based transparent ceramics provided by the method of the invention have obvious advantages that: the ceramics have substantially improved thermal conductivity, thus meeting the thermal dissipation requirements of ceramic substrates and enabling high power LED to work normally; also, the difficult problem of excess sintering temperature of pure alumina ceramics is solved; and rare earth-doped alumina-based transparent ceramics prepared by the formula and method of the invention have a sintering temperature of only 1370DEG C.

Description

technical field [0001] The invention relates to a method for rapid sintering of aluminum oxide-based transparent ceramics with high thermal conductivity by low-temperature hot pressing. Background technique [0002] In recent years, as the greenhouse effect has become more and more serious, the sustainable development of green environmental protection has been paid more and more attention by the society. In the electronic industry, power saving and energy saving of LED have always been a hot topic, and its development has gradually possessed many mature advantages, such as power saving, high efficiency, high response speed, long life and environmental protection advantages, plus small size, Light weight, can be set on various surfaces and other features, these features make LED applications more and more diversified, and provide a stable growth market for the LED industry, so the research on LED has become more and more popular among domestic and foreign scholars and researc...

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B35/63C04B35/64
Inventor 唐新桂贾振华刘秋香蒋艳平
Owner GUANGDONG UNIV OF TECH
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