Composite of aluminum and boron nitride nanotubes and method for manufacturing same
a technology of boron nitride nanotubes and composite materials, which is applied in the direction of inorganic chemistry, non-metallic elements, chemistry apparatuses and processes, etc., can solve the problems of poor interfacial bondability between aluminum matrix and carbon nanomaterials, insufficient homogeneous dispersion, and insufficient chemical stability of carbon nanomaterials in aluminum matrixes, etc., to achieve excellent shape flexibility and shape controllability, and cost reduction
Inactive Publication Date: 2019-10-17
HITACHI METALS LTD
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Benefits of technology
The present invention provides an Al / BNNT composite that has excellent shape flexibility and shape controllability, and is cost-effective. The composite is made by dispersing boron nitride nanotubes in a metallic matrix, which can be made from aluminum or an aluminum alloy. The method for manufacturing the composite involves a powder mixing step, an alloy melt mixing step, and a casting step. The resulting composite has improved mechanical properties and can be used in various applications.
Problems solved by technology
At present, however, new problems are arising, such as poor interfacial bondability between the aluminum Matrix and the carbon nanomaterial, and insufficient homogeneous dispersion and insufficient chemical stability of the carbon nanomaterial in the aluminum matrix.
However, since the technique disclosed in Yanming Xue et al. employs a special manufacturing method, a high-pressure torsion technique, it is disadvantageous in that the composite has poor shape flexibility and shape controllability, and the cost of forming the composite into a desired shape is prone to be high.
Meanwhile, casting is considered as unsuitable for manufacturing Al / CNT composites because CNTs react chemically with an Al melt to produce compounds such as carbides.
Method used
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Examples
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example 1
Fabrication of Example 1
[0065]According to the manufacturing method described above, a cast article as an Al / BNNT composite (hereinafter referred to as Al / BNNT composite cast article) of Example 1 was fabricated. First, 1 g of a BNNT powder (with the average particle diameter of 5 nm and the specific surface area more than 100 m2 / g) was put into 100 mL of ethanol and subjected to ultrasonic agitation for one hour to prepare a BNNT suspension (BNNT suspension preparation step S1a). The specific surface area was measured with a vapor adsorption amount measuring instrument (BELSORP-maxII, a product of MicrotracBEL Corp.).
[0066]Similarly, 1 g of a Si powder (of scale-like particles with the average particle thickness of 30 nm, the average particle size of 400 nm, and the specific surface area more than 100 m2 / g) was put into 100 mL of ethanol and subjected to ultrasonic agitation for one hour to prepare a Si suspension (Si suspension preparation step S1b).
[0067]Next, the whole of the BN...
example 2
Fabrication of Example 2
[0070]An Al / BNNT composite cast article of Example 2 was fabricated in the same manner as Example 1 except that a pure Al melt (A1100, 1 kg, 70.0° C.) was used.
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Abstract
There is provided a composite of a metallic matrix and boron nitride nanotubes, the metallic matrix including aluminum or an aluminum alloy. Also, there is provided a method for manufacturing the composite. The method includes: a powder mixing step of mixing a powder of boron nitride nanotubes and a powder of an element soluble in a molten metal of the metallic matrix to prepare a powder mixture of boron nitride nanotubes and a metallic matrix-soluble element; an alloy melt mixing step of mixing the powder mixture and the molten metal of the metallic matrix to prepare a metallic matrix melt mixed with boron nitride nanotubes; and a casting step of solidifying the metallic matrix melt mixed with boron nitride nanotubes to obtain the composite.
Description
CLAIM OF PRIORITY[0001]The present application claims priority from Japanese patent application serial no. 2018-078482 filed on Apr. 16, 2018, the content of which is hereby incorporated by reference into this application.FIELD OF THE INVENTION[0002]The present invention relates to technology of composites of metals and fine fibrous substances, and in particular, to a composite of a matrix of aluminum or an aluminum alloy (hereinafter referred to simply as aluminum) and boron nitride nanotubes dispersed in the matrix (hereinafter referred to as aluminum and boron nitride nanotube composite) and a method for manufacturing the composite.DESCRIPTION OF RELATED ART[0003]In order to improve mechanical properties of metallic materials, research and development has been carried out on technology of adding a fine fibrous substance to or mixing it into a metallic matrix. For example, JP 2010-196098 A discloses a metal matrix composite obtained by impregnating a preform including a plurality ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C22C32/00C22C1/02
CPCC22C32/0068C22C1/026C22C21/00C22C2026/003C22C26/00C22C1/1036C22C1/1047C01B35/14C22C49/06C22C47/14C01P2004/13B22D11/003
InventorOKAI, MAKOTOYAMAURA, HIDEKIYAMANE, HIDEYA
OwnerHITACHI METALS LTD