JP2007153645A - Laminate for nanotechnology formed by using flaky powder and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively and rapidly manufacture a laminate having excellent mechanical characteristics and high reliability appropriate as a substrate material and protective material for nanotechnology and a structural material for micromachining. <P>SOLUTION: The laminate is manufactured by applying the flaky powder coated with a binder and unidirectionally oriented with flat faces onto the substrate and calcining the coating, then peeling the coating from the substrate and subjecting the laminate to pressing from a direction perpendicular to the flat coating surface, followed by calcining or sintering. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The invention of this application relates to a laminate produced using flaky powder and a method for producing the same. More specifically, the invention of this application relates to a laminated body useful as a nanotech substrate material or protective material produced using a flaky powder, and a structural material for a micromachine, and a method for producing the same.

  As a structural material for micromachines, a substrate material for nanotechnology, and a protective material, a composite material having a dimension (dimension) of several to several hundred microns and high reliability is required.

  With such a size, the non-uniformity of the material cannot be ignored in the conventional composite material using constituent materials of the order of several to several tens of microns. Therefore, in order to ensure reliability, it is necessary to use a smaller constituent material and to make a composite on the order of submicron or less. Further, by making a fine composite structure, in addition to high reliability, high toughness and high strength may be achieved. In particular, this effect can be remarkably expected in a laminated material that can obtain a large composite effect with a simple structure.

As a method for producing a laminated structure of sub-micron order or less, conventional self-organization using a biomimetic process (imitating a living organism), vapor deposition method (Patent Document 1), spin coating method (Patent Document 2), Production methods such as a sputtering method (Patent Document 3) and a CVD method (Patent Document 4) are known. In any of these manufacturing methods, a very thin layer can be uniformly formed, and it is also known to manufacture a laminated structure of about a dozen layers.
: JP 2002-1863 A : JP-A-2005-146308 : JP 2001-328198 A : JP 2001-332749 A

  However, the conventionally known method for producing a laminated structure for nanotechnology is a technique for producing a "thin film", and more like a substrate material for nanotechnology, a protective material, or a structural material for micromachines. It is technically very difficult to produce bulk laminates that require thick multilayer stacks. In addition, the conventional manufacturing method cannot be used practically because it has major problems in terms of cost and process time.

  Therefore, in view of the circumstances as described above, the invention of this application is a simple method of solidifying and molding a laminated body that can be expected to have many applications as a technology supporting nanotechnology as a solution to such problems. To provide a laminate capable of expressing mechanical characteristics peculiar to a bulk nanocomposite structure having a fine laminate structure and imparting functionality using a flake powder having a thickness of several μm to several hundreds of nm Is an issue.

  The invention of this application is to solve the above-mentioned problems. First, the flake powder coated with a binder is pressed from a direction perpendicular to the flat surface in a state where the flat surface is oriented, and is fired or sintered. Provided is a method for producing a laminate for nanotechnology.

Secondly, the above method is provided in which the preferred flaky powder is a metal, ceramics, glass, organic substance, or inorganic layered substance.

  Third, the above method is provided in which the binder suitable for coating the flaky powder is metal, glass, or organic matter.

  Fourth and fifth, processing conditions suitable for the invention of this application are provided.

  Sixth, it provides a laminate suitable for nanotech that can be finely adjusted in submicron order or less, obtained by the above manufacturing method.

  According to the first method for producing a laminate, it is possible to provide a method for producing a bulk laminate having a laminate structure useful for fine nanotechnology by a simple method of solidifying and molding flaky powder. it can.

  According to the invention of the method for producing the second laminate, a suitable flaky powder can be used.

  According to the third method for producing a laminate, a binder suitable for coating flaky powder can be used.

  According to the fourth and fifth laminate manufacturing methods, a range of processing conditions suitable for solidification molding can be specified.

  According to the invention of the sixth laminate, a laminate suitable for nanotech that can be finely adjusted to a submicron order or less can be obtained.

  The invention of this application is applied after coating a material serving as a binder on the surface of a flake powder of a metal such as alumina powder, glass powder, aluminum powder, ceramics, glass, organic matter, inorganic layered substance, or a composite thereof. The flake-like powder in the invention of this application is a so-called flat plane in which the aspect ratio of the cross-sectional shape of the powder is not 1 but is characterized by being solidified by firing or sintering by pressure and heating. It means a powder having a shape, and the range of the aspect ratio is not limited. The material for the flake powder is preferably a flake powder such as metal, ceramics, glass, or organic matter, or inorganic layered material such as mica or graphite, but the type is not particularly limited. . The binder may also be various, and can be selected from metals, glasses, organic substances, and the like. In the formation of the flaky powder laminate, in the invention of this application, the flaky powder is fired or sintered by applying pressure from a direction perpendicular to the flat surface of the flaky powder (including a substantially vertical direction).

For example, a powder coated with a binder is made into a slurry and applied on a flat plate with a flat spatula and then dried to make a temporary sintered body, which is fired while applying a uniaxial press perpendicular to the flat coated surface, etc. Can also be exemplified as a preferred form. In any case, at the time of molding, as shown in the schematic diagram of FIG. 1, the plane of the flaky powder (1), that is, the flat plane is vertical (substantially vertical) toward the orientation direction (2). It only needs to be oriented. That is, the flaky powder (2) only needs to have flat surfaces that are parallel or substantially parallel to each other as shown in FIG. However, it is necessary to control the atmospheric temperature during solidification molding to a temperature at which the flaky powder material and the coating material do not vaporize. Moreover, it is also possible to finally obtain a laminated body by reacting flake-like powder material or coating material and atmospheric gas in situ during solidification molding. Note that there are various methods for applying the binder. For example, when the binder is a metal or alloy such as silver, copper, aluminum, tin, or zinc, a method such as plating, electroless plating, vapor deposition, or spraying is used. However, when the binder is an organic substance such as a resin or a curable compound, a method of spraying, mixing, dipping, or depositing these melts is considered as an example.

  Therefore, the present invention will be described in more detail below with reference to examples. Of course, the invention of this application is not limited by the following examples.

  Of the aluminosilicate glass flakes shown in Table 1 as a flaky powder, electroless plating is performed using aluminosilicate glass flakes having a thickness of 0.7 μm and an average particle diameter (average of flat plane maximum diameter) of 20 μm. A silver coating with a thickness of about 50-100 nm was applied. FIG. 2 is a photograph showing the general shape of the aluminosilicate glass flakes.

A slurry (weight mixing ratio glass flake: water: PVA = 100: 130: 4) in which this aluminosilicate glass flake was mixed with an aqueous polyvinyl alcohol (PVA) solution was prepared. This slurry was overcoated about 100 times on a molybdenum foil while applying a shearing force with a metal flat spatula to obtain a molded body having a thickness of about 1.2 cm. After cutting this molded body into a disk shape with a diameter of about 30 mm, the molybdenum foil was removed, placed in a graphite die with a diameter of 30 mm, and pressed with a vertical press (21.2 kN) at 943 K in vacuum (10 Pa). 900s pulse electric current sintering was performed. A cross-sectional view of the material produced by the above method is shown in FIG.

  The produced glass flakes were oriented along the laminate surface, and the sintered laminate was completely densified. Metal (silver) was present between the glass flakes, and the glass flakes were adhered. The fracture resistance (toughness) of the sintered laminate was simply evaluated by the Vickers indentation method. Normally, when a Vickers indenter is driven into a single glass material, cracks are generated from the four corners (vertices) of the indentation, whereas the laminate manufactured by the method of the invention of this application is completely in a direction perpendicular to the lamination surface. Cracks were not observed, and it was confirmed that they had a large fracture resistance (FIG. 4).

It is the figure which showed the oriented flake powder typically. It is the photograph which showed the general view of the aluminosilicate glass flake. It is a scanning electron micrograph of the cross section of the laminated body which consists of glass / silver produced by the method of this invention. The fracture resistances of the glass / silver laminate (A) and the single glass material (B) of the present invention are compared by an indentation method.

Explanation of symbols

1: Flake powder 2: Orientation direction

Claims (6)

A method for producing a laminate, comprising applying a binder and applying pressure from a direction perpendicular to a flat coated surface of a flaky powder having a flat plane oriented, and firing or sintering. The method for producing a laminate according to claim 1, wherein the flaky powder is at least one selected from metals, ceramics, glass, organic substances, and inorganic layered substances. The method for producing a laminate according to claim 1 or 2, wherein at least one selected from metal, glass, and organic matter is used as the binder. The method for producing a laminate according to any one of claims 1 to 3, wherein the calcination or sintering temperature is carried out in a region where the flaky powder and the binder do not agglomerate and the binder is bonded. The method for producing a laminate according to any one of claims 1 to 4, wherein the firing or sintering is performed under a reduced pressure and high temperature environment. A laminate for nanotechnology, which is produced by the production method according to any one of claims 1 to 5.