SU1156852A1 - Method of producing bimetallic strip - Google Patents

Abstract

THE METHOD OF OBTAINING A BIMETALLIC TAPE, including rolling the powder of the working layer on a metal substrate by co-rolling between the rollers, is about the fact that rolling an intermediate layer of carbonyl iron powder onto the surface of the metal substrate; the intermediate layer is applied in a wavy manner in the direction transverse to the rolling direction, with a height of are full on the ridge of 0.1-0, 3b, with a wave height in the depression equal to 0 03-0,09b, and with a distance between the tops of the waves equal to 0,3-0,5h, where b is the thickness working layer SL b5 About SP

Description

one . . The invention relates to powder metallurgy, in particular to the preparation of bimetallic materials with antifriction, friction, wear-resistant properties used in various fields of technology. A known method for producing a bimetallic tape, including powder filling onto a metal substrate, heating and co-rolling, allows the use of powders with spherical particles C1. The disadvantages of this method are the laboriousness of the process that requires the sintering of a powder layer on a substrate and, besides, limited technological capabilities, since the method is limited by the composition of powder mixtures, in particular in mixtures that include low-melting components, I tin in the copper-tin mixture), at the heating temperature of the hot ribbon, the liquid phase of the low-melting component is formed. The formation of a liquid phase with further pressure treatment decreases the plastic and strength properties. The closest in technical essence and the achieved result to the invention is a method of obtaining a bimetallic tape, including rolling the powder of the working layer on a metal substrate by co-rolling between rolls. The known method involves rolling with one idle roller on the C2Head side. The disadvantages of this method are the low adhesion strength of the working layer and the substrate, as well as the limited range of the resulting bimetallic tapes. The purpose of the invention is to increase the adhesion strength of the working layer and the substrate and the expansion of the range of bimetallic tapes obtained. bake an intermediate layer of carbonyl iron 2 .2 powder, and the intermediate layer is applied in a wave-like direction in the direction of the rolling direction and, with a height full on a ridge equal to 0.1-0.3, with a wave height in a depression equal to 0.03-0.09f, and with a distance between the tops of the waves equal to 0.3-0.5 b , where li is the thickness of the working layer. Increasing the adhesion strength of the working layer and the substrate is due to the fact that during the rolling process the rolled powder material is pressed into the troughs of the intermediate layer. FIG. T shows the rolling pattern; in FIG. 2 - rolled tape, cut. The scheme contains a roll 1; bunker 2, metal substrate 3; working layer 4, intermediate layer 5. In FIG. 2 is indicated: n is the thickness of the substrate i) is the thickness of the working layer, Vi is the height of the wave on the crest of the intermediate layer; lij is the height of the wave in the depression of the intermediate layer b; the distance between the wave vertices of the intermediate layer. The bimetallic tape is produced on a mill with two drive rolls (roll diameter 180 mm). The width of the hopper and the width of the substrate are the same. They are 100 mm, the length of the substrate is 180 mm ,. thickness 2 mm. Rolling speed 3 m / min. For knurling use powder compositions of the alloy MK-5 and ZhGrZM15. Carbonyl iron powder is used as a material for the intermediate layer. Example 1. The manufacture of a bimetallic tape is carried out by rolling a powder of composition MK5 on a metal substrate with a pre-applied layer of carbonyl iron powder. Baking temperature 920С. The total thickness of the rolled bimetallic tape is 5 mm. The intermediate layer is applied in waves in the direction transverse to the direction of rolling. The height of the crest is 0.3 mm (h 0.1 ti), the height of the wave in the depression is 0.09 mm (0.03 S), the distance between the wave tops is 0.9 mm (b and 0.3 h) . During the rolling process, the ribbon does not stratify. Example 2. The manufacture of a bimetallic strip is carried out by

rolling powder ZHRZM15 composition on a metal substrate with a pre-applied layer of carbonyl iron powder. The temperature of baking is 920 ° С. The total thickness of the rolled bimetallic tape is 5.3 mm. The intermediate layer is applied in waves in the direction transverse to the direction of rolling. The height of the wave on the ridge is 1i 0.7 mm (h 0.21), the height of the wave in the depression ti2 is 0.2 mm {1i2 0.06 fi), the distance between the tops of the waves is 1.3. mm

(v 0,4ii) .; . ::

and ROME er 3. The manufacture of a bimetallic tape is carried out by rolling the composition MK-3 on a substrate with a prearity deposited layer of carbonyl Iron powder. Temperature n | ypecani The total thickness of the 5-rolled bimetallic tape is 5.5 mm. The intermediate layer is applied in a wavy manner in the direction transverse to the direction of rolling. Wave height pas gretNS 11 mm (h 0.31p), wave height in the depression i 0.3 mm

(112 0.09 1i), the distance between the wave widths 1 3 2.5 mm (L 0.5). In the rolling process, the tape does not stratify.

Example 4. A bimetallic tape is made by rolling mixtures of powders of the type MK-5, ZhGrZM15 on a metal substrate treated with shot (fraction size 1-1.5 mm). Laminated bimetal strips are stratified.

The table shows data on the adhesion strength of the working layer and the substrate of the bimetallic tape after sintering (according to GOST 10885-75).

As follows from the data in the table, the proposed method allows several times to increase the adhesion strength of the working layer and the substrate in comparison with the known (for the same material class).

The proposed method allows the powder to be applied from any material or their compositions to a metal substrate.

,, 0.3 90-110 CHI, 0.1h)

lij- 0.09 (bj 0, OZ)

t, 0.9 (fe 0.31i)

0.6 MO 140 0.2 h) 0.2 0.0711)

1.2

110-120

3

(li, 0.1M

. .

(1,, 03111

 B 1 (b 0.3 b)

1i 0.7

120-150

C 0,2h.

Lg (hj) b 1,3

.., - X (k 0.4b,

B, 0.9

110-140 (L 0.31i) 2 0.3 (Kj 0.091-1 L 1.5 (L 0.5) |

By a known method

, 9 10-155,1

Table continuation

i:

3 14

a 0.4)

B, 1

120-150

, Bc)

(, 09b)

, 7

(, 5Ы

10-20

Claims (1)

METHOD FOR PRODUCING BIMETALLIC TAPE, including rolling the powder of the working layer on a metal substrate by co-rolling between the rollers, which consists in that, in order to increase; the adhesion strength of the working layer and the substrate and the expansion of the nomenclature of the obtained bimetallic ribbons, before rolling the powder onto the surface of the metal substrate, an intermediate layer of carbonyl iron powder is baked, and the intermediate layer is applied in a wave-like direction transverse to the rolling direction with a wave height of 0.1 on the crest -0.3h, with a wave height in the cavity equal to 0.03-0.09h, and with a distance between the wave peaks of 0.3-0.5 V, where h is the thickness of the working layer. 1156852 2