SU1246180A1 - Incandescence body for electric light sources - Google Patents

Abstract

The invention approaches the field of electrical engineering, namely, carbon filament bodies for electric light sources. The aim of the invention is to increase the mechanical strength, luminous efficiency and lifetime of the filament body. The filament body is a composite in which the carbon fiber is in the form of a filament yarn and forms a reinforcing skeleton. Neurocarbon fills the pore space of the reinforcing cage and is a matrix. This makes it possible to obtain a filament body of uniform composition, which increases its mechanical strength. 2 tab. "E (L .4; O5

Description

The invention relates to electrical engineering, namely, carbon filament bodies for electrical light sources, and can be used in the manufacture of incandescent lamps for general and special purposes.

The purpose of the invention is to increase the mechanical strength, luminous efficiency and lifetime of the filament body.

This is achieved by performing a filament body of a carbonized carbon complex polyfilamentary filament in the form of a helix with the number of filaments 70-2000 compositely associated with a pyrocarbon, the carbon fiber acting as a reinforcing skeleton (filler), and pyrocarbon is a matrix, and the volume ratio fiber and carbon carbide is (40-60): (60-40).

The filament body is a composite, the carbon fiber of which is represented as a multifilamentary filament and forms the reinforcing skeleton of the composite, and the pyrolytic carbon fills the pore space of the reinforcing skeleton and is a matrix, with the indicated volume contents of the fiber in the composite and the number of filaments of the polyfilamentary filament. This allows

to obtain a filament body that is completely uniform along the entire length of the cross section, uniform in composition, which increases its mechanical strength, service life and light output. Polyfilamentarity of carbon fiber provides the necessary elasticity of the spiral body of the heat.

Example. A 28 mm long thread made of polyacrylonitrile fiber containing 700 filaments is wound on a 10 mm diameter quartz mandrel using a manual winding machine to produce a spiral with a number of turns equal to 12. The ends of the threads are fixed with organic glue mixed with graphite. The obtained billet is subjected to thermochemical treatment at 1050 ° C in vacuum in a stream of methane for 60 hours. During this time, pyrocarbon is deposited in the amount of 55 vol. - / o content (45% fiber). After thermochemical processing, the workpieces are removed from the quartz mandrel and subjected to high-temperature processing at a graphite mandrel at 2400 ° C with an exposure at the final temperature for 2 hours. The resulting channel body is tested in an LNU-lamp, the test results are summarized in table. 1. (sample 11).

Table 1

The rest of the body filament of carbon fiber based on cellulose hydrate (GC) and polyacrylonitrile (PAN) fibers, are presented in table. 1, obtained similarly, with the difference that the number of filaments of the carbon filament and the ratio of carbon fiber and pyrocarbon vary (the required amount of pyrolytic carbon is obtained by changing the heat treatment time in methane medium from 15 to 100 h).

Vibration tests show that the helix compacted by pyrolytic carbon Hydratsel

The volume ratio of fiber and pyrocarbon (40-60) :( 60-40) provides the necessary electrical resistance of the filament body and the uniformity of the mechanical and electrical characteristics of the filament body.

When the content of pyrocarbon is less than 40%, the healing of filament defects is not ensured, which leads to a heterogeneity of the mechanical and electrical properties of the heat body and, as a consequence, to a decrease in the service life of the heat body.

When the pyrolytic carbon content exceeds 60%, the strength characteristics of the incandescent body deteriorate (brittleness increases) The number of filaments in the incandescent body is less than 70 does not provide sufficient mechanical strength of the incandescent body, and when the number of filaments exceeds 2000, the electrical characteristics of the incandescent body deteriorate. Polyfilamentary filaments from elemental fibers (filaments) HZ, PAN and other

Compiled by N. Semenov

Editor N. RogulichTechred I. VeresKorrektor M. Demchik

Order 4008/46 Circulation 643 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

The house is kept for 23 hours and 35 minutes, while the monofilament stands only for 14 hours and 40 minutes.

The technology of manufacturing the proposed incandescent body is quite simple and does not require the use of equipment of complex design.

In tab. Figure 2 shows the characteristics of carbon fibers that can be used to produce a filament body.

table 2

gyx, various twists, not having their burrs, delaminations and cracks visible to the naked eye. The diameter of the individual filaments is 5-12 µm, since it is technically difficult to obtain a fiber with a smaller diameter, and if the diameter is more than 12 µm, the quality of the thread deteriorates.

Claims (1)

Invention Formula The filament body for electric light sources, made of carbonized carbon fiber, reinforced with carbon graphite pyrocarbon, characterized in that, in order to increase its mechanical strength, light output and service life, a polyfilament filament with the number of filaments 70-2000, compositionally bonded to pyrocarbon with a volume ratio of filament yarn and pyrocarbon (40-60): (60-40).