DE2728114A1 - ALLOYS AND THEIR USE AS STOCK MATERIAL - Google Patents

Description

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1A-49 487

Patent application

Applicant: THE GLACIER METAL COMPANY LIMITED 368 Eallng Road, Alperton, Wembley, Middlesex, England

DAIDO METAL COMPANY LTEU 2 Sanage-Cho, Kita-ku, Nagoya, Japan

Title: Alloys and their use as storage material

709881/0902

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1A-49 487

description

The invention relates to alloys for bearing materials, commonly known as "white metals" and can be defined as alloys in which a predominant component is tin or lead or cadmium is.

An object of the invention is to provide such an alloy which is capable of being securely bonded to steel or another bearing pad material to be bonded, and which has good tensile strength, toughness, impact resistance and has fatigue resistance.

According to the present invention, the alloy consists of O to 1.5 parts by weight 96 cadmium, from traces to 9 wt -.% Copper, from traces to 13 parts by weight 96 antimony, from O to 2 wt .-% manganese, from 0 to 2 wt. 96 nickel, from 0.001 to 0.5 wt. 96 chromium, from 0.005 to 0.5 wt. 96 cobalt, the remainder being tin.

It should be noted that the alloy does not contain beryllium, but contains cobalt as an essential component along with it Chrome.

It has been found that white metals containing chromium with regard to their microstructure or their structure and their storage properties can be significantly improved by the addition of cobalt, this improvement can even be obtained where the alloy slowly solidifies from the melt, as is common practice with the manufacture of bearings with a massive steel base

709881/0902

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position, and it is therefore a great advantage of the alloy that even with slow solidification, satisfactory storage properties can be obtained

One result of the slow cooling is that the copper / tin needle length in an alloy containing copper tends to enlarge greatly when the cooling was slow, but when cobalt is in the present sense Invention is present, then investigations under regulated laboratory conditions showed that the magnification the needle length is not much larger if the cooling is slow.

A preferred weight percentage of cobalt is about 0.3 56 in order to achieve this influence on the needle length.

However, adding as little as 0.05% cobalt to the white metal can increase the tensile strength of the quenched casting alloy by about 5 % without affecting the toughness, which remains essentially constant up to over 20%. With slow cooling, the tensile strength of the alloy can be increased by about 20 % compared to an alloy that does not contain cobalt. After slow cooling, the tensile strength can be around 20 % higher.

The table below shows the tensile strength, percent elongation, and hardness for eight alloys that were produced by Slow Cooling were obtained and do not contain cobalt together with chromium and a ninth alloy according to the invention, whereby one can see the improvement of the storage properties.

Tabel:

709881/0902

1A-49 487

Component weight%

Property tone

I.rqierunqon ι

Ku-Anti- Cadnf '.' R non mi around

Tin 'other add [ % hardness j solid ₂ j elastic

MN / m I nunq

Con vfin tio nnl Ie

r.oqie run qon

2.03

3.64 j

• 3.64 ¹ J, '> O

3.70,

ι ■.

According to the invention

3.71

7.45

8.61

Π, 92 7.83 8.54 8.43

8.64

53.0

68 _; O

6.0
3.0

0.31 -Co 71.0 i 7, o
0.27 Mnj 67 _; o ι f., o
0.34 Nij 7o, oj fi, o 30.6 0.14 Cr

30.4

31.7

26.8

0.15 Cr
Be

72 _; O
74.0

0.23 Co 87jO
0.11 Cr

7.0
8, O

31.1 31.2

fi2, O

33.7

Then, Fig. 1 shows, for a particular alloy, the improvement in tensile strength obtainable with increasing amounts of cobalt, and see; that by about 0.1 or 0.15 % cobalt there is only a slight further improvement in tensile strength.

Fig. 2 shows how the copper / tin (Cu6, Cu3) needle length decreases with increasing proportions of cobalt and that a further small decrease is obtained when 0.2% cobalt is contained. The special alloy composition was in each case 3.46-3.72 % copper, 8.32-8.64 % antimony, 0.79-0.91% cadmium, 0.094-0.10 % chromium with different amounts of cobalt and the rest is made of tin.

The general effect is always the same as long as the amount of chromium is in the range of 0.005-0.5 % .

709881/0902

ORIGINAL INSPECTED

1A-49

27281H

In general, it can be said that the best results are obtained with about 0.1 % cobalt, while the finest microstructure is obtained with about 0.3 % cobalt.

Another benefit is that the alloy microstructure when chromium is used in conjunction with cobalt this is much less sensitive to the effects of the arsenic present, which means that the copper-tin precipitate is coarser if only chromium (or chromium and beryllium) is present.

The following examples are those for white metal alloys according to the invention.

example 1 Copper 3.10 wt. 96, antimony 8.92 wt. 96, cadmium 0.96 wt. 96, Chromium 0.11% by weight, cobalt 0.19% by weight, the remainder tin. Example 2 Copper 2.75 wt. 96, antimony 7.34 wt. 96, cadmium 1.40 wt. 96, Chromium 0.16 wt. 96, cobalt 0.29 wt. 96, remainder tin. Example 3 Copper 4.73 wt. 96, antimony 8.64 wt. 96, cadmium 0.67 wt. 96, Chromium 0.05 wt. Ji, cobalt 0.41 wt. 96, remainder tin. Example 4

Copper 3.50 wt. 96, antimony 8.76 wt. 96, cadmium 0.83 wt. 96, Chromium 0.09 wt. 96, cobalt 0.23 wt. 96, nickel 0.26 wt. 96, remainder tin.

Example 5

Copper 3.41 wt. 96, antimony 8.24 wt. 96, cadmium 0.96 wt. 96, Chromium 0.08 wt. 96, cobalt 0.15 wt. 96, nickel 0.12 wt. 96, remainder tin.

⁸¹⁰³ 709881/0902

L e r s e i t e

Claims (8)

Claims 1. Alloy consisting of 0 to 1.5 wt .-% cadmium, of Traces up to 9 wt .-% copper, of traces up to 13 Göw .- # Antimony, from 0 to 2 wt .-% manganese, from 0 to 2 wt .-% nickel, from 0.001 to 0.5% by weight cobalt, the remainder tin. 2. Alloy according to claim 1, characterized in that it contains more than 1 % copper. 3. Alloy according to one of the preceding claims, characterized in that it contains more than 5 % antimony. 4. Alloy according to one of the preceding claims, characterized in that it contains more than 0.1 % cadmium. 5. Alloy according to one of the preceding claims, characterized in that it contains about 0.1 % cobalt. 6. Alloy according to one of claims 1 to 4, characterized in that it contains about 0.3 % cobalt. 7. Use of the alloy according to one of the preceding claims as a bearing material for bearings with a support shell 709881/0902 ORJGlNAL INSPECTED 8. Bearing consisting of a base with a coating of an alloy according to one of the preceding Expectations. 709881 / 09D /