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Patent Analysis of

Improvements in and relating to means for preventing the erosion of metals

Updated Time 15 March 2019

Patent Registration Data

Publication Number

GB392145A

Application Number

GB1931022417

Application Date

07 August 1931

Publication Date

11 May 1933

Current Assignee

INTERNATIONAL GENERAL ELECTRIC COMPANY

Original Assignee (Applicant)

INTERNATIONAL GENERAL ELECTRIC COMPANY

International Classification

C23C4/18,C23C4/02,C23C4/08

Cooperative Classification

C23C4/02,C23C4/08,C23C4/18

Inventor

Abstract

Metal articles which are subject to erosion are protected by spraying with wear-resisting metals such as alloys of manganese, chromium, tungsten, molybdenum, cobalt, or the like. An intermediate coating of a metal which readily alloys with both the foundation metal and the coating metal may be provided. The article may be subjected to a heat treatment either before or after coating, the heat treatment being preferably carried out in a neutral or reducing atmosphere. The coating of turbine blades either entirely or locally, e.g. at the inlet edge, is referred to.

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Claims

claim is:-

1. A process for ennobling metals but 90 slightly resistant to erosion by the application of a resistant metal thereto, characterised in that wear-resisting Pke 4s &IOf' -y'I J1 --- 3924145 metals such as alloys of manganese; chromium, tungsten, molybdenum, cobalt or the like are sprayed on the foundation metal, for example by means of a suit-=-5able spraying gun.

2. A process according to Claim 1, characterised in that the foundation metal is heated-to a temperature facilitating the bonding process, before the wear-resisting To metal is sprayed on. 3. A process according to Claim 1, characterised -in that the workpiece- is; subjected to a heat treatment after the operation of spraying the wear-resisting metal has been completed. - _ 4. A process according to Claims- 1 and 2, or 1 and 3, characterised inthat-^ the; heat treatment is carried out in a neutral or a reducing atmosphere.

20- 5.V A process according to Claim 1, characterised in that when the alloying power between the foundation metal and the wear-resisting metal is low, the foundation metal is provided in a known manner, prior to the application of the 25 wear-resisting metal, with a coating of a metal which readily allovys with the wearresisting metal as well as with the foundation metal.

6. Tui.bine blades whenever made of 30 one of the lower quality metals or - alloys exhibiting small resistance to erosion and rendered wholly or in part more resistant to erosion by a, process according to any one of the preceding Claims - -Dated this 30th dayof aly; 1931.

JOHN GRAY, Crown House, Aldwych, London, W.C. 2, - -Agent for the Applicants.

Redhill Printed for His Majesty's Stationery Office, by Love & Malcomson, Ltd.-1933.

Mi :2 J = --- 1 1 1 f 1 1 1 i t - i 7 i -t i I

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Claim Tree

  • 1
    1. A process for ennobling metals but 90 slightly resistant to erosion by the application of a resistant metal thereto, characterised in that wear-resisting Pke 4s &IOf' -y'I J1 --- 3924145 metals such as alloys of manganese; chromium, tungsten, molybdenum, cobalt or the like are sprayed on the foundation metal, for example by means of a suit-=-5able spraying gun.
    • 2. A process according to Claim 1, characterised in that the foundation metal is heated-to a temperature facilitating the bonding process, before the wear-resisting To metal is sprayed on.
    • 3. A process according to Claim 1, characterised -in that the workpiece- is; subjected to a heat treatment after the operation of spraying the wear-resisting metal has been completed. - _
    • 5.V A process according to Claim 1, characterised in that when the alloying power between the foundation metal and the wear-resisting metal is low, the foundation metal is provided in a known manner, prior to the application of the 25 wear-resisting metal, with a coating of a metal which readily allovys with the wearresisting metal as well as with the foundation metal.
  • 4
    4. A process according to Claims- 1 and 2, or 1 and 3, characterised inthat-^ the; heat treatment is carried out in a neutral or a reducing atmosphere. 20-
  • 6
    6. Tui.bine blades whenever made of 30 one of the lower quality metals or - alloys exhibiting small resistance to erosion and rendered wholly or in part more resistant to erosion by a, process according to any one of the preceding Claims - -Dated this 30th dayof aly; 1931. JOHN GRAY, Crown House, Aldwych, London, W.C. 2, - -Agent for the Applicants. Redhill Printed for His Majesty's Stationery Office, by Love & Malcomson, Ltd.-1933. Mi :2 J = --- 1 1 1 f 1 1 1 i t - i 7 i -t i I
See all 3 independent claims

Description

---A S Bet---\

-ot.-The application for a Patent has become void.

This print shows t e cation as it became open to publio inspection under Section 91 (3) (a) af the Acts.

- PATENT SPECIFICATION

Convention Date (Germany): Aug. 29, 1930. 3 929 1A Application Date (in United Kingdom): Aug. 7, 1931. No.22,477/31.

[5 Complete not Accepted.

COMPLETE SPECIFICATION.

- Improvements in and relating to Means for Preventing the drosioni I,- X X, - of i -atals, We, INTERNATIONAL GrEEBRnAL= ELECTRIC COMPANY, INCORPORAT:D, of 120, Broadway, New York, United States of America, Merchants,- a Corporation- organised under the laws of the State of New York, United States of America, (Assignees of ALLGEhMEIBIE E LEETRICITXTSGESELLSO.HAIITM, of Friedrich Karl-Ifer 2/4, Berlin, N.W., Germany, a German Company), do hereby declare the nature of this invention and in what manner the same is to be performed,. to be particularly described and ascertained in and by the following statement:-

It has been proposed to provide the surface of metals which undergo considerable wasting at certain points owing to erosion, with a coating of a resistant metal. This has been effected for example 'by plating the foundation metal with a resistant metal or by welding-on the ennobling metal after it had been reduced to a liquid condition. Plating, however, can be carried out only on smooth pieces of work, such as sheets, plates and bars. The method of welding the liquefied ennobling metal requires very high temperatures, involves uneven heating of the workpiece and causes stresses 'which give rise to serious alterations in shape and deformation of the $: whole workpiece or the welded ennobling metal cracks. Both these methods are therefore unsuitable for the form given to intricate workpieces such as turbine blades with reinforced and sharpened inlet edge.

Owing to its high initial cost, it is not practicable to resort to the proposal in respect of turbine blades for example, that the whole workpiece should be made of high-quality and erosion-resisting metal.

To obviate these disadvantages, it is proposed according to the present invention to coat the foundation metal with wear-resisting metals such as alloys of [Piree 1/-] manganese, chromium, tungsten, molylbdenui,- c-obalt or the like [by the spraying method, for example by-means of a suitable spraying,guun. Ins order to facilitate the bonding process between the foundation metal and the ennobling metal, the former may be heated to a high. temperature prior to the spraying 15 of the ennobling metal; alternatively, a heat treatment may be applied after the operation of spraying the ennobling metal has been completed. The heat treatment in either case is preferably carried out 60 in a neutral or reducing atmosphere in order to avoid the oxidizing of the foundation and ennobling metals during the course of the treatment.

Should the foundation metal and the 65 ennobling metal exhibit slight tendency to alloy, the foundation metal may be provided in a known manner (before the ennobling metal is applied) with a coating of a metal which readily forms an alloy with the ennobling metal as well as with the foundation metal.

The process forming the sabject-matter of the present invention is particularly suitable for use in the case of turbine 7t blades, when the blades can be coated, either wholly or in part for example at the inlet edge with an ennobling metal.

The use of the subject matter of the present invention is nevertheless not 80 restricted to turbine blades, as it is applicable to all cases where it is a question of providing a lower quality constructional metal at highly-stressed parts with an ennobled surface.

Having now particularly described and 85 ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what we

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