SU1715496A1 - Method of manufacturing triple-layer band of non-atomized gas adsorbent - Google Patents

Abstract

The invention relates to powder metallurgy, in particular to the preparation of getters used to create and maintain high vacuum in various devices. The goal is to increase the mechanical properties and sorption activity of gas absorbers. Powders of a metal or alloy of the base layer and powders of the getter material are simultaneously fed to the deformation zone, and the particle size distribution of the base layer powders is, in mass%: particles with a size up to 40 µm 70-80, with a size of 40-80 µm 20-30Ј and getter powders: up to 20 microns 10-30 wt.%} 20-70 microns 70- 90 May. The powders roll and set in vacuum at 9.50-1000 C. 1 table. (L with

Description

The invention relates to the production by means of powder metallurgy of getters (getters) used to create and maintain high vacuum in various devices .;

The purpose of the invention is to improve the mechanical properties and sorption activity of gas absorbers.

A three-layer tape was obtained on a mill: with two horizontal rollers with a diameter of 100 mm at a rolling speed of 1.5 m / min using a special hopper for feeding powders into the deformation zone. The design of the bunker allows you to adjust the ratio of the masses of the powders of the substrate and ha4 of the absorber while simultaneously feeding them to the rolls, and hence

the thickness of the layers of the three-layer tape.

Powder of metal or alloy of the carrier layer is loaded into the bunker between partitions parallel to its side walls (in the middle zone), and getter powder is loaded between the side walls and partitions (into the peripheral zone). The following powders were tested: iron, stainless steel, nickel as a substrate, cit (1 g - 16 wt.% A1) as a getter, 30% wt. Vr alloy - 20 wt.% Ti.

After rolling, a strip consisting of three layers was obtained. With a tape width of 100 mm and a total thickness of .0.9 mm, the thickness of the active gas absorption

J

SO About

3 17

The body layers were 0.3 mm on each side.

After rolling, the tape is cut into plates with a length of 200 mm and sintered in vacuum.

In order to determine the rate of hydrogen sorption, samples with a width of 30 mm and a length of 180 mm are cut down from the plates. The tests are carried out on the stand getter

materials by measuring the rate of hydrogen sorption at a constant flow in a 73-liter chamber and a maximum vacuum of 4 ± 10 Torr. Temperature test 200 ° C.

For mechanical tests, samples were made from plates with dimensions of 70x15 0.9 mm. The tests were carried out on an Instron type testing machine.

Example. Electrolytic nickel powder containing 75% by weight of particles up to 40 μm in size (i.e. passing through a 40 μm mesh with a mesh size) and 25% by weight of particles ranging in size from 40 to 80 μm were poured into an average bunker zone and powder The alloy containing 16 wt.% Al, the rest Zr, obtained by the method of hydride-calcium reduction and consisting of 20 wt.% particles with sizes up to 20 microns, the rest particles with dimensions 20-70 microns, were poured into the peripheral zones of the bunker. Carried out a joint rolling of powders and cutting the resulting three-layer tape. Sintering the plates was carried out in a vacuum of 10 mm Hg. at a temperature . samples Ј

The ultimate strength ft is 6.8 kg / mm2 and the rate of hydrogen sorption after activation at 700 ° C for 15 minutes and a test temperature of 200 C 5h 3.5 l / s "cm2.

Various ratios of the fractional composition of the substrate and getter powders, as well as the temperature

0

five

0

five

Baking patterns, the results are presented in the table.

As follows from the data in the table, the proposed method allows a 1.5-fold increase in the tensile strength and specific rate of hydrogen sorption after activation

900 C compared to the known (for this and the same class of getter materials).

The use of the proposed invention will increase the speed of hydrogen pumping by 1.5 times with a significant increase in the reliability of the design of sorption pumps.

Claims (1)

Invention Formula A method of manufacturing a three-layer unsprayed gas absorber belt, including simultaneous feeding of a carrier layer into the middle deformation zone, and a gas getter powder into the peripheral zones, co-rolling of the powders and subsequent sintering in vacuum, about tl and h and y and that, in order to increase the mechanical properties and sorption activity of the getter, powder of the base layer of the following particle size distribution, wt.%. Particle size up to 40 microns Particles with size 40-80 microns and powder getter take the following particle size distribution, wt.%: Particle size up to 20 microns 10-30 Particle size 20-70 micron 70-90, the sintering of the ribbon is carried out at 950-1000 ° C. 70-80 20-30, Experience, № 75 70 80 25 30 20 20 20 20 950 950 950 6.8 59 6.2 3.5 3.7 3.5 Table continuation