Semi-transparent ceramic arc tube and its producing method

A manufacturing method and translucent technology, applied in the manufacture of discharge tubes/lamps, electrode systems, cold cathodes, etc., can solve the problems of low production efficiency, inability to guarantee the coaxiality and dimensional accuracy of the three components, etc. The effect of long life, low light decay and high color rendering

Inactive Publication Date: 2007-07-25
SHENZHEN UPCERA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the 3-piece arc tube, it needs to be bisque-fired and reshaped before it can be assembled and sintered. The production efficiency is low, and the coaxiality and dimensional accuracy of the three parts after assembly cannot be guaranteed.

Method used

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  • Semi-transparent ceramic arc tube and its producing method
  • Semi-transparent ceramic arc tube and its producing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A. Add 0.1% magnesium oxide (MgO) to ultrafine alumina powder with a purity greater than 99.99%, mix it with an organic binder, and granulate it. Add 5% polyethylene, 8% paraffin and 1% stearic acid to the batch of main parts; add 4.5% polyethylene, 7.5% paraffin and 1% stearic acid to the batch of end parts.

[0039] B. Perform injection molding at 130° C. and 80 MPa to obtain blanks of each component.

[0040] C. Assemble the end face part and the main part directly, heat up to 600°C at a heating rate of 30°C / hour for degreasing, then raise the temperature to 1300°C at a heating rate of 100°C / hour, and hold for 2 hours for pre-sintering.

[0041] D. Put the pre-sintered arc tube into a hydrogen sintering furnace and keep it warm at 1780°C for 3 hours.

[0042] The density of the transparent alumina ceramic arc tube obtained by the above manufacturing method is 3.985g / cm 3 , the average grain size is 20 microns to 30 microns, the three-point bending strength is 400MP...

Embodiment 2

[0045] Add 0.01% magnesium oxide (MgO) and 0.02% Y to ultrafine alumina powder with a purity greater than 99.99% 2 o 3 Afterwards, it is mixed with an organic binder and granulated. Add 5% polyethylene, 8% paraffin and 1% stearic acid to the batch of main parts; add 4.5% polyethylene, 7.5% paraffin and 1% stearic acid to the batch of end parts.

[0046] Using the same injection molding, assembly, degreasing and sintering process as in Example 1, a translucent alumina ceramic arc tube was obtained.

[0047]The density of the transparent alumina ceramic arc tube obtained by the above manufacturing method is 3.986g / cm 3 , the average grain size is 20 microns to 40 microns, the three-point bending strength is 380MPa, and the linear light transmittance is 32%.

Embodiment 3

[0049] A. Add 0.005% magnesium oxide (MgO) and 0.01% La to ultrafine alumina powder with a purity greater than 99.99% 2 o 3 After that, it is mixed with organic binder and granulated. Add 4.8% polyethylene, 8.4% paraffin and 1% stearic acid to the batch of main parts; add 4.2% polyethylene, 7.8% paraffin and 1% stearic acid to the batch of end parts.

[0050] B. Perform injection molding at 120° C. and 60 MPa to obtain blanks of various parts.

[0051] C. Assemble the end face part and the main part directly, heat up to 600°C at a heating rate of 25°C / hour for degreasing, then raise the temperature to 1300°C at a heating rate of 100°C / hour, hold for 2 hours for pre-sintering,

[0052] D. Put the pre-sintered arc tube into a hydrogen sintering furnace and keep it warm at 1820°C for 3 hours.

[0053] The density of the transparent alumina ceramic arc tube obtained by the above manufacturing method is 3.987g / cm 3 , the average grain size is 30 microns to 40 microns, the three...

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Abstract

The ceramics arc tube includes columniform main body, and ball ends at two ends of the main body. Central tip at the ball end is extended outward to form capillary, which is a hollow tube passing through the ball end. The method includes steps: adding 0.005-0.5% magnesia to superfine alumina powder in high purity, and mixing it to organic binder, carrying out granulating procedure; using the mixture to prepare main body, and ball ends by injection molding; assembling the main body, and two ball ends, and after degreasing it at low temperature and pre-sintering procedure, connecting the three parts to form an integral arc tube; under 1750 - 1850 deg.C, putting the pre-sintered arc tube to hydrogen sintering furnace for heat preservation for 2-6 hour so as to obtain semitransparent ceramics arc tube of alumina. Features are: assembling injection molded main body, and ball ends directly in order to suit scale production, long service life, high light effect and color rendering etc.

Description

technical field [0001] The invention relates to a metal halide lamp arc tube and a manufacturing method, in particular to a translucent alumina ceramic arc tube and a manufacturing method. Background technique [0002] Ceramic materials have the characteristics of acid and alkali resistance, high temperature resistance, and excellent chemical stability. Compared with metal halide lamps made of quartz materials, ceramic metal halide lamps using polycrystalline alumina translucent ceramics as arc tube materials have high operating temperature, high luminous efficiency, low light decay, good color rendering, and long life. advantage. [0003] At present, the arc tubes of ceramic metal halide lamps are mainly made of translucent alumina ceramics, and there are mainly three types of shapes, namely cylindrical, cylindrical and conical combined, and ellipsoidal. Each type can be divided into 1-piece, 2-piece, 3-piece and 5-piece due to different manufacturing methods. [0004] C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/30H01J61/36H01J9/24H01J9/26C04B35/10C04B35/622C04B35/63
Inventor 司文捷王鸿娟
Owner SHENZHEN UPCERA CO LTD
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