Method for preparing aluminium borate whisker preform

A technology for aluminum borate whiskers and preforms, which is applied in the field of preparation of aluminum borate whiskers preforms, can solve the problems of long time consumption, high energy consumption, increased production costs and the like, and achieves the effect of reducing production costs

Inactive Publication Date: 2008-11-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above methods all have the disadvantages of long time consumption and high energy consumption.
The method of Document 1 requires 8 to 12 hours for ultrasonic dispersion. Although the method of Document 2 takes less time for ultra

Method used

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  • Method for preparing aluminium borate whisker preform
  • Method for preparing aluminium borate whisker preform
  • Method for preparing aluminium borate whisker preform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: the preparation volume is Aluminum borate whisker cylindrical preform with volume fraction of aluminum borate whisker 30%.

[0017] (1) According to the volume fraction formula: vol % = m v · ρ Calculate the mass m of the aluminum borate whiskers required, where vol% is the whisker volume fraction, v is the whisker volume, and ρ is the whisker density. Weigh 44.7g of aluminum borate whiskers and 2.3g of aluminum phosphate as a binder, put them into a stirrer respectively, add 448ml of water and 90ml of sodium polyacrylate with a mass concentration of 3‰ into the stirrer as a dispersant.

[0018] (2) Adjust the rotational speed of the agitator to 180 rpm and stir for 30 seconds, pause for 60 seconds, stir again for 30 seconds, pause for 60 seconds, stir again for 30 seconds to obtain a mixed slurry.

[0019] (3) Filter and remove 80% o...

Embodiment 2

[0023] Embodiment 2: the preparation volume is Aluminum borate whisker cylindrical preform with volume fraction of aluminum borate whisker 25%.

[0024] (1) According to the volume fraction formula: vol % = m v · ρ Calculate the mass m of the aluminum borate whiskers required, where vol% is the whisker volume fraction, v is the whisker volume, and ρ is the whisker density. Weigh 37.3g of aluminum borate whiskers and 1.9g of aluminum phosphate as a binder, put them into a stirrer respectively, add 373ml of water and 75ml of sodium polyacrylate with a mass concentration of 4‰ into the stirrer as a dispersant.

[0025] (2) Adjust the rotational speed of the agitator to 200 rpm and stir for 30 seconds, pause for 90 seconds, stir again for 30 seconds, pause for 90 seconds, stir again for 30 seconds to obtain a mixed slurry.

[0026] (3) Filter and remove 80% o...

Embodiment 3

[0030] Embodiment 3: the preparation volume is The aluminum borate whisker cylinder prefabricated body whose volume fraction of aluminum borate whiskers is 20%.

[0031] (1) According to the volume fraction formula: vol % = m v · ρ Calculate the mass m of the aluminum borate whiskers required, where vol% is the whisker volume fraction, v is the whisker volume, and ρ is the whisker density. Weigh 29.8g of aluminum borate whiskers and 1.5g of aluminum phosphate as an adhesive, put them into a stirrer respectively, add 298ml of water and 60ml of sodium polyacrylate with a mass concentration of 5‰ into the stirrer as a dispersant.

[0032] (2) Adjust the rotation speed of the stirrer to 210 rpm and stir for 30 seconds, pause for 120 seconds, stir again for 30 seconds, pause for another 120 seconds, stir again for 30 seconds to obtain a mixed slurry.

[0033] ...

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Abstract

The invention discloses a preparation method for an aluminum borate whisker preform which is characterized by comprising the following steps: according to the proportion, aluminum borate whisker, aluminum phosphate, water and sodium polyacrylate are placed in an agitator, the rotating speed of which is adjusted to be 180 to 220 revolutions per second; the mixture is stirred and dispersed for a plurality of times in a time-shared way, and then mixed slurry is obtained; 80 percent of water in the mixed slurry is filtered and the rest is placed in a concave mould for pressure maintaining for five to eight minutes; the mould is taken off to gain a bisque of the preform; the dried bisque of the preform is sintered at the temperature of 800 to 900 DEG C in a muffle furnace for two to three hours; the bisque is cooled with the furnace and the whisker preform is obtained. In the method, the sodium polyacrylate with concentration of 0.3 to 0.5 percent is taken as dispersant, the aluminum borate whisker is stirred and dispersed for a plurality of times in the time-shared way, and meanwhile the aluminum phosphate is added as adhesives, so that the whisker is guaranteed to be fully soaked and then dispersed, and meantime, the adhesives is totally fused into the slurry. Compared with the present ultrasonic dispersion technique, the method shortens the original dispersion time of one to two hours to 3.5 to 5.5 minutes, thus reducing the cost.

Description

technical field [0001] The invention relates to a preparation method of an aluminum borate whisker preform. Background technique [0002] Whisker-reinforced metal matrix composites are currently mainly prepared by extrusion casting and pressure infiltration, etc., both of which need to make the whiskers into a prefabricated body, and then impregnate the molten metal liquid into the prefabricated body under pressure. . This requires that the whisker preform not only has a certain porosity to ensure that the metal liquid can completely infiltrate the preform, but also has sufficient compressive strength to withstand the pressure applied when the metal liquid is infiltrated. In addition, whether the dispersion of whiskers in the preform is uniform or not directly affects the mechanical properties of the composite material. Therefore, in order to produce metal matrix composites with excellent performance, the whisker preform must meet three conditions, uniform whisker dispersi...

Claims

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Application Information

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IPC IPC(8): C22C47/06
Inventor 李贺军李正佳齐乐华欧阳海波苏力争
Owner NORTHWESTERN POLYTECHNICAL UNIV
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