Method of making ceramic connector for connecting optical fibres

FIELD: physics.

SUBSTANCE: zirconium dioxide powder is mixed with temporary process binder. Injection moulding is carried out with a rod made of fluorocarbon-based material, which is removed together with the temporary process binder with further sintering.

EFFECT: reduced signal loss owing to simple achievement of coaxiality of capillary openings.

1 tbl

 

This invention relates to a ceramic connectors connecting the optical fiber communication lines, integrated circuits, semiconductor devices. Ceramic splice products fiber-optic communication lines (FOCL) must be able to withstand extreme environmental conditions and have high precision capillary holes (0,126+0.001 mm for single-mode fibers; to 0.127+0,004 mm for multimode fibers). The capillary hole in a ceramic ferrules must be precisely aligned with the outer surface of the connector, to prevent any longitudinal displacement of the fiber relative to the connecting joint during operation to minimize optical losses. Through a narrow capillary hole should be easy to pass the optical fiber. Quality ceramic connectors for fiber optic is determined by the molding method.

It is known that the optimal method of manufacturing a ceramic connectors with the capillary hole, the size of which is maximally close to the nominal, is injection molding. In the patent (U.S. No. 5034170, VS 45/80) presents a technical solution associated with high-precision adjustable injection molding singlemode optical connectors.

This method requires the production of high-precision complex the s forms, which increases the cost of manufacture of ceramic optical connectors.

The dimensional accuracy of the inner bore, outside diameter and alignment of these diameters are determined by the precision mold making and molding of the rod while casting.

In the invention of the firm TOTO Ltd (USA, No. 5615291 G0B 6/36 25.03.1997) as forming the capillary hole of the stem in the blank ceramic connector applies the rod of tungsten carbide.

The closest technical solution is the solution that is presented in the patent (Japan, No. 1-45042). In this method, the injection molding as forming the capillary holes of the rod used wire of Nickel alloys. This method does not give the maximum approximation to the nominal dimensions of the capillary holes, so you need a long grinding holes. Prolonged use of grinding holes leads to the fact that on the inner surface defects remain, bringing damage to the optical fiber when inserted into the connector. In this way the wire should be pulled from the hole, which leads to defects in the inner surface of the capillary holes.

The purpose of the invention to provide a preform of ceramic capillary tip with a hole, the size of which max is maximum close to the nominal and the inner surface of the hole for the optical fiber has no defects.

The objective is achieved by use of injection molding a ceramic powder mixed with a temporary process a bunch of plastic into the mold forming the capillary hole of the rod from the leader (PVDF-polyvinylidene fluoride).

This material has the hardness, strength, ability at pressures of pomevania 1500-2000 and temperatures up to 150-160°C to retain their dimensions accurate to a micron. This rod remains in forming inside the workpiece connector and removed along with the temporary technological bonded during sintering the billet tip.

The method is as follows.

As the original powder was used powder of Zirconia composition ZrO2+3 mol.% Y2About3obtained by chemical vapor deposition from solutions of salts.

The powder had the following properties:

The specific surface of particles S=8-10 m2/g;

Based density γ=6,0-of 6.02 g/cm3;

The crystallite size of 35-40 nm;

The size of the agglomerates of 0.5-1 μm.

The powder was mixed at a temperature of 170°C for 2 h with a time of technological bunch Siliplast - BUT (F., "Zschimmer-Schwarz"), in the amount of 17.5 wt.%. From this mass at a temperature of 140°C using a granulator manufactured granules of 3-mm Forming blanks were performed on automatic molding machine with the following parameters: injection pressure 1500-1600 bar, the temperature of the ceramic material 140-160°C, mould temperature of 60°C. the Injected plastic mass (slip) was in the form with the shank of the leader. After hardening rod cut from 2 sides. Billet ceramic connectors to flurocarbons rods in capillary holes was immersed in running water, heated to 70°C., for 2 hours At 60 wt.% ligament is removed from the mass of the workpiece and retains the shape of the tips of the capillary bore. Sintering of lugs carried out in 2 stages in electric furnaces. The first stage of sintering up to 1000°C for 2 h, the second - final sintering at temperatures of 1400-1500°C. Sintered billet connectors were cut along the capillary holes-and they were measured properties. The table presents the results of measurements of surface roughness, defects after sintering to mechanical processing.

Table

% experimentStem materialThe surface roughness of the hole, mcm
RaRz Rt
1the leaderfrom 0.3 to 0.481,6-1,83and 2.26-2,5
2Wire stainless steel, coated with Teflon1,2-2,06-1020-22
the placeholder
3Wire - Nickel alloy0,8-1,22,2-2,66,9-7,6

The invention allows to simplify obtaining alignment of the capillary holes and to reduce the cost of manufacture of ceramic connectors. The surface of the inner capillary openings is defect-free.

Method of manufacturing ceramic connector for connecting optical fibers comprising a mixture of a powder of zirconium dioxide with a time of technological ligament, injection molding into the mold forming the capillary hole of the core, removing the temporary technological binder and sintering, wherein forming the rod is made of a material based on leader, who remains Ave is forming inside the workpiece connector and removed along with the temporary technological bonded during sintering.



 

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