JP2008260646A - Molding die for molding selenium-containing glass and manufacturing method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding die for molding a selenium-containing glass which is excellent in durability by avoiding corrosion caused by selenium, and a manufacturing method of the same. <P>SOLUTION: The molding die 8 for molding a selenium-containing glass comprises a base material 1 made of steel, a covered layer 2 composed of a nickel-phosphorous alloy formed on the surface of the base material 1, a metal mold-release film 5, formed on the surface of the covered layer 2, containing at least one member selected from the group consisting of platinum, rhenium, iridium, rhodium, ruthenium, palladium, osmium, and gold, wherein a nickel oxide film 7 is formed on the surface of the covered layer corresponding to portions to be formed with pin holes of the metal mold-release film 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a selenium-containing glass molding die and a method for producing the same.

  As is well known, infrared night vision cameras have been applied to detect pedestrians during night driving of automobiles. In such an infrared night-vision camera, as a lens material for detecting far-infrared rays radiated from a human body, germanium or the like can be mentioned. However, mass production by mold press molding cannot be performed, and cost reduction is an issue.

  In recent years, infrared lenses capable of mold press molding are being developed. Many of them are materials containing selenium in germanium. By the way, a diffraction grating is required for an infrared lens, and therefore, a Ni-P alloy layer is required as a processing layer for processing the diffraction grating in a molding die. Usually, a Ni-P alloy layer is further coated with a noble metal release film.

  However, if there is even a pinhole in the release film on the surface, selenium contained in the selenium-containing glass (glass material) used for lens molding reacts with the underlying Ni-P alloy layer, and corrosion progresses, releasing the mold. The film was peeled off.

Conventionally, Patent Document 1 is known as a method for manufacturing a glass optical element molding die. Patent Document 1 is a technique for avoiding the occurrence of cracks in the surface coating layer on the surface of a mold, and a thermal expansion coefficient is selected at a predetermined value at 400 to 500 ° C. after selecting a base material. A technique for performing heat treatment is disclosed. However, in Patent Document 1, since volume shrinkage due to crystallization occurs only in the surface coating layer during heat treatment, a large tensile stress may act on the surface coating layer to cause cracks.
JP-A-11-157852

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a selenium-containing glass molding die excellent in durability by avoiding corrosion by selenium and a method for producing the same.

  (1) The selenium-containing glass molding die according to the present invention comprises a steel base material, a coating layer made of a nickel-phosphorus alloy formed on the surface of the steel base material, and a surface of the coating layer. At least one of platinum (Pt), iridium (Ir), rhenium (Re), rhodium (Rh), ruthenium (Ru), palladium (Pd), osmium (Os), and gold (Au) formed. A selenium-containing glass molding die provided with a metal release film containing, and an oxide film made of nickel is formed on the surface of the coating layer corresponding to the pinhole formation planned portion of the metal release film It is characterized by.

  (2) A selenium-containing glass molding die according to the present invention includes a steel substrate, a coating layer made of a nickel-phosphorus alloy formed on the surface of the steel substrate, and the surface of the coating layer. It is characterized by comprising an oxide film made of nickel and formed on.

  (3) The method for producing a selenium-containing molding die according to the present invention corresponds to the above (1), a step of forming a coating layer made of a nickel-phosphorus alloy on the surface of a steel substrate, and this coating Forming a metal release film containing at least one of platinum, iridium, rhenium, rhodium, ruthenium, palladium, osmium, and gold on the surface of the layer, and heating the metal release film in an oxidizing atmosphere, A step of forming an oxide film made of nickel on the surface of the coating layer corresponding to the planned pinhole formation portion.

  (4) The method for producing a selenium-containing molding die according to the present invention corresponds to the above (2), a step of forming a coating layer made of a nickel-phosphorus alloy on the surface of a steel substrate, and an oxidizing atmosphere And heating to form an oxide film made of nickel on the surface of the coating layer.

  According to the present invention, a selenium-containing glass molding die excellent in durability can be obtained by avoiding corrosion by selenium by the oxide film made of nickel formed on the surface of the coating layer.

Hereinafter, the present invention will be described in more detail.
The present inventors are mold press-molding an infrared transmitting material containing selenium in a mold provided with a coating layer made of a Ni-P alloy and a noble metal release film for processing a diffraction grating on a steel material base material. As a result, I noticed that the release film peeled off in some places. As a result of investigating the cause, it was found that selenium vapor was generated from the glass material, and the selenium vapor corroded the underlying coating layer through the pinhole that was originally present in the release film. Then, the release film was depressed due to the corrosion of the underlying coating layer, and the peeling range gradually expanded. Here, since the corrosion is caused by gas, the corrosion could not be prevented even if the film forming process of the release film was reviewed and the pinhole was made very small.

  Therefore, the present inventors have studied to improve the corrosion resistance of the coating layer made of Ni-P alloy against selenium, and as a result, found that the corrosion resistance is remarkably improved when the coating layer made of Ni-P alloy is oxidized. It came to do. It was found that if the release film was coated and heated in an oxidizing atmosphere, only the pinhole portion of the release film could be selectively oxidized.

Next, specific examples of the present invention will be described.
Example 1
Please refer to FIG. First, 100 μm of electroless Ni—P plating was applied to the base material 1 of the steel material, and the plating layer was processed with a diamond bit to form a coating layer 2 made of a Ni—P alloy. Next, a nickel (Ni) film 3 and an alloy film 4 made of platinum (Pt) and iridium (Ir) were coated by sputtering. Here, the Ni film 3 and the alloy film 4 are collectively referred to as a metal release film (thickness 350 nm) 5. At this time, a pinhole 6 of about φ1 μm was observed on the surface of the metal release film. Subsequently, a heat treatment is performed in an oxidizing atmosphere at 400 ° C. for 2 hours to form a 10 nm thick oxide film 7 made of Ni on the surface of the coating layer 2 exposed from the pinhole 6, thereby manufacturing a glass molding die 8. did.

  According to Example 1, as shown in FIG. 1, a coating layer 2 and a metal release film 5 are formed on a substrate 1, and an oxide film made of Ni is formed on the surface of the coating layer 2 positioned below the pinhole 7. 7 is formed. Therefore, it was possible to manufacture a mold capable of precise processing and excellent durability with respect to a glass material containing selenium. As a result, peeling of the metal release film 5 can be prevented, and mass production of an infrared transmitting material is possible.

Table 1 below shows the results of molding an infrared transmitting material containing selenium with the glass mold 8. For comparison, a mold that was not heated after the coating of the Ni film and the alloy film 4 (Comparative Example 1) and a mold that was heated in vacuum (Comparative Example 2) were also molded under the same conditions.

(Example 2)
Please refer to FIG. First, 100 μm of electroless Ni—P plating was applied to the base material 1 of the steel material, and the plating layer was processed with a diamond bit to form a coating layer 2 made of a Ni—P alloy. Next, heat treatment was performed in an oxidizing atmosphere at 400 ° C. for 2 hours to form an oxide film 7 made of Ni on the surface of the coating layer 2, thereby manufacturing a glass molding die 9.

  According to the second embodiment, as shown in FIG. 2, since the coating layer 2 and the oxide film 7 are sequentially formed on the substrate 1, the same effects as the first embodiment are obtained.

  In addition, this invention is not limited to the said Example as it is, A steel element can be deform | transformed and embodied in the implementation stage in the range which does not deviate from the summary. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiments. For example, some components may be deleted from all the components shown in the embodiments. Furthermore, the constituent elements in different embodiments may be appropriately combined. Specifically, the materials, thicknesses, and the like of the constituent members are merely examples, and are not limited to those described in the above embodiments.

FIG. 1 shows a partial cross-sectional view of a selenium-containing glass molding die according to Example 1 of the present invention. FIG. 2 shows a partial cross-sectional view of a selenium-containing glass molding die according to Example 2 of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Base material, 2 ... Coating layer which consists of Ni-P alloy, 3 ... Ni film, 4 ... Alloy film, 5 ... Metal mold release film, 6 ... Pinhole, 7 ... Oxide film, 8, 9 ... For glass molding Mold.

Claims (4)

A steel base material, a coating layer made of a nickel-phosphorus alloy formed on the surface of the steel base material, and platinum, iridium, rhenium, rhodium, ruthenium, palladium formed on the surface of the coating layer , A selenium-containing glass molding die provided with a metal release film containing at least one of osmium and gold,
A selenium-containing glass molding die, wherein an oxide film made of nickel is formed on a surface of the coating layer corresponding to a pinhole formation scheduled portion of the metal release film. A steel base, a coating layer made of a nickel-phosphorus alloy formed on the surface of the steel base, and an oxide film made of nickel formed on the surface of the coating layer Selenium-containing glass mold. A step of forming a coating layer made of a nickel-phosphorus alloy on the surface of a steel substrate, and at least one of platinum, iridium, rhenium, rhodium, ruthenium, palladium, osmium, and gold on the surface of the coating layer A step of forming a metal release film including two and a step of heating in an oxidizing atmosphere to form an oxide film made of nickel on the surface of the coating layer corresponding to a pinhole formation scheduled portion of the metal release film A method for producing a selenium-containing glass molding die characterized by the above. A step of forming a coating layer made of a nickel-phosphorus alloy on the surface of a steel substrate, and a step of forming an oxide film made of nickel on the surface of the coating layer by heating in an oxidizing atmosphere. A method for producing a selenium-containing glass mold.

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