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Preparation method for anti-knock environment-friendly cerium tungsten filament

A cerium tungsten and environmental protection technology, applied in the field of cerium tungsten wire, can solve the problems of difficult wire drawing, difficult to control uniformity, low filament yield, etc., and achieve the effects of long service life, increased shock resistance, and good wire winding performance.

Inactive Publication Date: 2015-06-10
TIANJIN YONGPAN ILLUMINANT MATERIALS
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  • Description
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AI Technical Summary

Problems solved by technology

The uniformity of cerium-tungsten element doping is difficult to control, and the wire drawing process is also difficult. The yield of filaments processed to Φ0.39 and below is extremely low, which is also an important reason restricting the application and development of cerium-tungsten wires.

Method used

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Embodiment Construction

[0013] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

[0014] A method for preparing an anti-shock environment-friendly cerium tungsten wire, the steps of the preparation method are as follows:

[0015] ⑴. Choose ammonium paratungstate with square monoclinic crystal. The particle size is controlled at 30μm~50μm. It has high activity, and the powder has good fluidity and filling ability. Al(NO3)3 solution, K2SiO3 solution, Co(NO3)2 solution, its aluminum, cobalt and other elements can promote potassium element to enter the tungsten matrix, thereby significantly reducing the low-temperature brittleness of tungsten wire, reducing the splitting of tungsten wire, and making the produced Tungsten wire has good anti-sag performance at high temperature;

[0016] (2) After mixing, one part is directly r...

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Abstract

The invention relates to a preparation method for an anti-knock environment-friendly cerium tungsten filament. The preparation method comprises the following steps: (1), choosing quadrate monoclinic ammonium paratungstate, and mingling an Al(NO3)3 solution, a K2SiO3 solution and a Co(NO3)2 solution, wherein the elements such as aluminum and cobalt can promote a potassium element into a tungsten matrix; (2), reducing temperature to 550 DEG C-660 DEG C in the first stage, and reducing the temperature to 610 DEG C-810 DEG C in the second stage; (3), after ignition, sieving mixed materials, sintering or performing high-temperature incipient fusion sintering for two times in a medium-frequency induction furnace; (4), preparing a finished product of a tungsten filament in a multi-machine cogging rotation calcination manner. The tungsten filament disclosed by the invention is good in an anti-knock property, high in finished product rate and long in service life and can be processed to phi 0.39 mm, and the preparation method can be widely used in the fields such as spaceflight, aviation, photoelectron, information technology engineering and illumination.

Description

technical field [0001] The invention belongs to the field of cerium tungsten wires, in particular to a preparation method of shockproof and environment-friendly cerium tungsten wires. Background technique [0002] Compared with traditional thoriated tungsten alloy wire, cerium-tungsten alloy wire has low electron work function (EΦ is only 2.8eV, which is 10% lower than thoriated tungsten), and high emissivity (27 times higher than thoriated tungsten at 1500K temperature) , High luminous efficiency (10-15% higher than that of thoriated tungsten wire), low arc starting voltage (only about 40% of that of thoriated tungsten), no radioactive pollution that is harmful to human body, it is a good green product, etc. Advantages, it is widely used in electron emission tubes, argon arc welding, etc. to replace thoriated tungsten alloy wires, and has very broad application prospects in high-demand electric light sources. [0003] The processing of cerium tungsten wire belongs to the d...

Claims

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Application Information

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IPC IPC(8): B22F9/20B22F9/24B22F3/16B21C37/04
Inventor 张建伟吴诚
Owner TIANJIN YONGPAN ILLUMINANT MATERIALS
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