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Method for producing Ca-La-F-based light-transparent ceramic, Ca-La-F-based light-transparent ceramic, optical member, optical system, and composition for ceramic formation

A manufacturing method and technology of light transmittance, applied in optical components, optics, chemical instruments and methods, etc., can solve the problems of easy cracking and poor processability, and achieve the effect of excellent optical performance

Active Publication Date: 2010-11-24
NIKON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, there is also a problem that cracks are easily generated due to rapid temperature changes, so the workability is poor

Method used

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  • Method for producing Ca-La-F-based light-transparent ceramic, Ca-La-F-based light-transparent ceramic, optical member, optical system, and composition for ceramic formation
  • Method for producing Ca-La-F-based light-transparent ceramic, Ca-La-F-based light-transparent ceramic, optical member, optical system, and composition for ceramic formation
  • Method for producing Ca-La-F-based light-transparent ceramic, Ca-La-F-based light-transparent ceramic, optical member, optical system, and composition for ceramic formation

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preparation example Construction

[0084] Preparation of Composition

[0085] And, these slurries or dry powdered CaF 2 Microparticles and LaF 3 The fine particles are combined to form a composition for forming ceramics. The ceramic-forming composition refers to a material capable of forming light-transmitting ceramics by sintering and making it transparent. As long as the composition for forming ceramics contains the above-mentioned CaF 2 Microparticles and LaF 3 Fine particles are sufficient, or they can be mixed uniformly. In addition, it may be in a powder form, or may be dispersed or suspended in a dispersion liquid like a slurry or the like.

[0086] Next, after preparing the ceramic-forming composition, the ceramic-forming composition is mixed as a slurry or a suspension by wet mixing. Thus mixing the CaF as homogeneously as possible 2 Microparticles and LaF 3 microparticles. If wet mixing is used to mix, it is difficult to use the CaF obtained by the reaction 2 Microparticles and LaF 3 The pr...

Embodiment 1

[0126] CaF 2 Production of Microparticles

[0127] 640 g of distilled water was added to 180.4 g (1 mol) of calcium acetate hydrate, and the said hydrate was completely dissolved, and the calcium acetate aqueous solution was prepared.

[0128] The same weight of distilled water was added to 163.8 g (4 mol) of 50% hydrofluoric acid (fluorinated acid) to prepare a hydrofluoric acid aqueous solution.

[0129] While stirring the calcium acetate aqueous solution by rotating a winged stirring bar (wing diameter: 10 cm) at 300 rpm, the hydrofluoric acid aqueous solution was gradually poured into the calcium acetate aqueous solution. A hydrofluoric acid aqueous solution injection port was installed on the side of a plastic beaker (13 cm in diameter) containing the calcium acetate aqueous solution, and the hydrofluoric acid aqueous solution sucked by the roller tube pump was injected into the calcium acetate aqueous solution over about 1 hour.

[0130] After the injection of the hydrof...

Embodiment 2、3

[0147] Except having set the molar ratio of La / Ca in wet mixing to 0.1, 0.4, it carried out similarly to Example 1, and obtained Ca-La-F type translucent ceramics.

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Abstract

This invention provides a method for producing a Ca-La-F-based light-transparent ceramic, comprising mixing fine particles of CaF2 with fine particles of LaF3 prepared separately from the fine particles of CaF2 to prepare a fine particle mixture and sintering the fine particle mixture to render the mixture transparent to light.

Description

technical field [0001] The present invention relates to a method for producing Ca-La-F-based translucent ceramics composed of calcium and lanthanum fluorides, Ca-La-F-based translucent ceramics, optical members, optical systems, and ceramics for forming Composition. [0002] This application claims priority based on Japanese Patent Application No. 2007-322437 for which it applied in Japan on December 13, 2007, and the content is used here. Background technique [0003] Fluorite (CaF 2 ) has an Abbe number (vd) as high as 95, excellent refractive index dispersion characteristics, and a small refractive index dispersion with respect to the wavelength of light. Furthermore, fluorite has a high transmittance of light from the ultraviolet range to the infrared range. Therefore, fluorite is well known as an excellent optical material. [0004] When a convex lens made of such an optical material is combined with a concave lens made of another material, chromatic aberration can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/553C01F11/22C01F17/00C04B35/50C30B29/12G02B1/02
CPCC04B2235/5445C04B35/6263C04B35/553C04B2235/9653C04B2235/3208C04B2235/5252C04B35/62635C04B2235/5454C04B2235/549C04B35/6264C04B2235/3227C04B2235/9661C04B2235/449C04B35/6455C04B35/645C04B2235/661C04B2235/5436C04B2235/3225G02B1/02B82Y30/00C04B2235/761
Inventor 石沢均
Owner NIKON CORP
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