Preparation method of heteromorphic microporous ceramic capillary

Abstract

The invention provides a preparation method of a heteromorphic microporous ceramic capillary. The preparation method comprises the steps of designing a special heteromorphic microporous ceramic capillary forming die, preparing special zirconia ceramic particles, matching a unique sintering forming technology to achieve primary sintering forming of a heteromorphic inner hole of the ceramic capillary without secondary processing, and designing a thimble positioning hole during forming green body preparation according to a product property of the heteromorphic microporous ceramic capillary to allow that an outside diameter grinding technology of the ceramic capillary is greatly simplified. For the ceramic capillary prepared by the method, the density reaches 6.0-6.10g/cm<3>; the hardness is greater than 1200HV; the bending strength is greater than 1200MPa; the dimensional tolerance of the inner hole is within 3 micrometers; the outside diameter grinding precision can reach 1-micrometer position precision; a glass capillary in a multi-core optical fiber collimator can be completely replaced; the matching precision with an optical fiber is high; the reliability meets a requirement of an optical passive device standard GR1209/1221.

Description

technical field [0001] The invention belongs to the technical field of optical fiber capillary manufacturing, and in particular relates to a method for preparing a special-shaped microporous ceramic capillary. Background technique [0002] Glass capillary is an important part of fiber optic collimator, which can be widely used in laser (wire-welding glass tube), optoelectronics, and optical communication industries, such as PLC splitter access end, optical fiber splitter, WDM wavelength division multiplexer, Supporting glass capillary tubes for optical fiber sensors, optical fiber array substrates, optical fiber connectors, etc.; in addition, quartz glass capillary tubes are also one of the key components and essential materials in the electronics, medical, and optical industries. [0003] At present, most of the capillary tubes used in the market are made of glass materials, and the production cost is high, especially for multi-core fiber collimators. Use in large quantiti...

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Problems solved by technology

However, the inner hole of the special-shaped microporous ceramic capillary cannot be processed later, which makes it extremely difficult for the dimensional accuracy of the inner hole and the position of the inner hole relative to the outer circle to reach the micron level, which cannot meet the requirements of optical passive devices such as optical fiber collimators for the capillary and optical fiber. Extremely high matching requirements

[0006] In addition, since the melting point of zirconia powder currently used to prepare ceramic capillaries is as high as 2715°C and the softening temperature is as high as 2390-2500°C, the powder itself has poor fluidity and is difficult to be directly used to form ceramic capillaries. Therefore, the production of ceramic capillaries Manufacturers generally add various additives to zirconia powder to make it into ceramic particles with good fluidity and uniformity, and then perform injection molding processing. However, due to the current zirconia powder in zirconia ceramic particles and various The mixed uniformity of the organic additives is poor, and some organic additives have certain volatility, which leads to the uneven and stable shrinkage of the formed ceramic capillary green body in the subsequent sintering process. The diameter of the ceramic capillary changes greatly. Without subsequent processing, the dimensional accuracy, concentricity or position of the inner hole and the outer circle of the prepared ceramic capillary is extremely difficult to meet the micron-level accuracy requirements, but the special-shaped microporous ceramic capillary At present, the inner hole of the zirconia ceramic particles cannot be obtained through subsequent processing, so the existing zirconia ceramic particles are not suitable for the preparation of special-shaped microporous ceramic capillaries.

[0007] Therefore, developing a preparation method for special-shaped microporous ceramic capillaries and solving the problems of the dimensional accuracy of the inner hole, the position of the inner hole relative to the outer circle, and the difficulty of grinding the outer diameter have become urgent problems in the industry.

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