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Injection molding method for nano aluminum nitride ceramics

A nano-aluminum nitride and ceramic injection technology is applied in the field of powder metallurgy to achieve the effects of fine grains, high tap density and good fluidity

Active Publication Date: 2015-08-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose an improved method for the application of nano-aluminum nitride powder as an injection molding raw material to prepare aluminum nitride ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A binder for injection molding of aluminum nitride ceramics of the present invention, the binder composition is as follows:

[0015] Microcrystalline Wax 60%

[0016] HDPE 15%

[0017] Polypropylene 14%

[0018] Stearic Acid 11%

[0019] The specific process steps of the binder for injection molding of aluminum nitride ceramics and the injection molding process of aluminum nitride of this embodiment are as follows:

[0020] (1) Slurry preparation: first, mix 1000g of nano-aluminum nitride powder with 50g of sintering aid yttrium oxide and 80g of polyethylene glycol by ball milling in alcohol, and then spray dry. The temperature of the air inlet of the spray granulator is 240°C , the air outlet temperature was 130° C., and the rotation speed was 8700 rpm, and the granulated material was collected.

[0021] (2) Feed preparation. Put 1000g of the granulated material and 220g of the binder of the above ingredients in a double roller machine for mixing. The mixing tempe...

Embodiment 2

[0026] A binder for injection molding of aluminum nitride ceramics of the present invention, the binder composition is as follows:

[0027] Microcrystalline Wax 60%

[0028] HDPE 15%

[0029] Polypropylene 14%

[0030] Stearic Acid 5%

[0031] Oleic Acid 6%

[0032] The specific process steps of the binder for injection molding of aluminum nitride ceramics and the injection molding process of aluminum nitride of this embodiment are as follows:

[0033] (1) Slurry preparation: first, mix 1000g of nano-aluminum nitride powder with 50g of sintering aid lanthanum oxide, and 120g of alcohol glue by ball milling in alcohol, and then spray dry. The temperature of the air inlet of the spray granulator is 240°C, The tuyere temperature was 130° C., the rotation speed was 8700 rpm, and the granulated material was collected.

[0034] (2) Feed preparation. Put 1000g of the granulated material and 220g of the binder of the above ingredients in a double roller machine for mixing. The m...

Embodiment 3

[0039] A binder for injection molding of aluminum nitride ceramics of the present invention, the binder composition is as follows:

[0040] Microcrystalline Wax 60%

[0041] HDPE 15%

[0042] Polypropylene 14%

[0043] Stearic Acid 11%

[0044] The specific process steps of the binder for injection molding of aluminum nitride ceramics and the injection molding process of aluminum nitride of this embodiment are as follows:

[0045] (1) Slurry preparation: first, mix 1000g of nano-aluminum nitride powder with 50g of sintering aid yttrium fluoride and 80g of polyethylene glycol by ball milling in alcohol, then spray dry, and the temperature of the air inlet of the spray granulator is 240 °C, the air outlet temperature was 130 °C, and the rotation speed was 8000 rpm, and the granulated material was collected.

[0046] (2) Feed preparation. Put 1000g of the granulated material and 220g of the binder of the above ingredients in a double roller machine for mixing. The mixing tem...

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Abstract

The invention discloses an injection molding method for nano aluminum nitride ceramics and belongs to the field of powder metallurgy. The injection molding method comprises the following steps of batching according to nano aluminum nitride powder and a sintering additive, wherein the addition amount of the sintering additive is 2 to 8 weight percent; adding 5 weight percent of coating agent to be mixed with absolute ethanol to obtain slurry; performing spray drying and granulating to obtain a nano aluminum nitride powder granulation material; placing the granulation material and a binding agent according to the mixture ratio of 50g to 9g-50g to 12g on a roller type mixer for mixing; performing injection molding on the mixture to obtain a green aluminum nitride body; degreasing and sintering the green aluminum nitride body to obtain the aluminum nitride ceramics. According to the injection molding method disclosed by the invention, the nano aluminum nitride powder is granulated in advance, so that the flowability, the apparent density and the tap density of the powder are improved; meanwhile, a coating layer is formed on the surface of the powder, so that the phenomenon that the oxygen content is increased as the powder generates a hydration reaction is prevented; the granulation material and the binding agent are mixed to obtain a feedstock for injection molding of the nano aluminum nitride; the nano aluminum nitride is subjected to injection molding, degreasing and sintering techniques to obtain the aluminum nitride ceramics; the aluminum nitride ceramics have the characteristics of good conformality, low sintering temperature, high strength and the like.

Description

technical field [0001] The invention belongs to the field of powder metallurgy and relates to an injection molding method of nano aluminum nitride ceramics. Background technique [0002] Aluminum nitride ceramics have good thermal conductivity, linear expansion coefficient close to that of silicon, high volume resistivity, low dielectric constant and dielectric loss. With excellent mechanical properties and other characteristics, it has very broad application prospects in the fields of electronics and energy. However, the degree of commercialization of AlN ceramics is not high, and the key factors restricting its development are high preparation costs and difficulty in forming complex ceramic parts. CIM is a type of powder injection molding (PIM). Powder injection molding is a new type of near net size forming technology developed by combining traditional powder metallurgy and modern plastic injection molding technology. The biggest feature of this technology is that it ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/581C04B35/626
Inventor 秦明礼鲁慧峰何庆刘昶陈鹏起吴昊阳曲选辉
Owner UNIV OF SCI & TECH BEIJING
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