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US3876742A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for manufacturing bladed members from powder material

Assignee: Rolls Royce PLC
•
Filing: 1973-01-16
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Granted: 1975-04-08
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Expires: 1993-01-16
📄 Original PDF 🌐 Google Patents

Abstract

Abstract The invention is concerned with manufacturing gas turbine engine components e.g. guide vanes and blades, in dense silicon nitride starting with silicon nitride in a powder form. Guide vanes are usually in the form of an aerofoil portion and two shroud portions and according to the invention, the aerofoil portion is made in a first mould by hot pressing a mixture of silicon nitride powder and a fluxing agent, such as magnesia. The formed aerofoil is placed in a second mould so that each end extends partly into a space which is to be filled with a further mixture of silicon nitride powder and a fluxing agent. The further mixtures are hot pressed both to form the shroud portions and to amalgamate the shroud portions with the aerofoil portion. Features, such as, flanges and webs can be formed in the shrouds during the moulding process or they can be machined into the shrouds after the vane is removed from the second mould.

Inventors

  • 👤 Jack Raymond Bird

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 21:06
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/593; B; B22; B22F; B22F5/00; B22F5/04; B23; B23P; B23P15/00; B23P15/04; F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/284; Y; Y02; Y02T; Y02T50/00; Y02T50/60

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 126 words
A METHOD OF MAKING A BLADED MEMBER, THE MEMBER INCLUDING AN AEROFOIL SECTION AND AT LEAST ONE SHROUD PORTION, THE METHOD INCLUDING THE STEPS OF HOT PRESSING A FIRST MIXTURE OF NITRIDE POWDER AND A FLUXING AGENT IN A SUITABLY SHAPED FIRST MOULD TO FORM SAID AEROFOIL PORTION PLACING THE FORMED AEROFOIL PORTION IN LOCATING MEANS, THE AEROFOIL PORTION EXTENDING PARTLY FROM ONE END AT LEAST OF THE LOCATING MEANS, PLACING THE LOCATING MEANS IN A SECOND MOULD, PLACING A SECOND MIXTURE OF SILICON NITRIDE POWDER AND FLUXING AGENT IN A SUITABLY SHAPED PORTION OF THE SECOND MOULD, THE AEROFOIL PORTION EXTENDING INTO SAID SECOND MIXTURE, HOT PRESSING THE SECOND MIXTURE TO FORM THE SHROUD PORTION AND TO AMALGAMATE THE SHROUD PORTION WITH THE AEROFOIL PORTION.
Claim 2
Independent Claim 126 words
A METHOD OF MAKING A BLADED MEMBER, THE MEMBER INCLUDING AN AEROFOIL SECTION AND AT LEAST ONE SHROUD PORTION, THE METHOD INCLUDING THE STEPS OF HOT PRESSING A FIRST MIXTURE OF NITRIDE POWDER AND A FLUXING AGENT IN A SUITABLY SHAPED FIRST MOULD TO FORM SAID AEROFOIL PORTION PLACING THE FORMED AEROFOIL PORTION IN LOCATING MEANS, THE AEROFOIL PORTION EXTENDING PARTLY FROM ONE END AT LEAST OF THE LOCATING MEANS, PLACING THE LOCATING MEANS IN A SECOND MOULD, PLACING A SECOND MIXTURE OF SILICON NITRIDE POWDER AND FLUXING AGENT IN A SUITABLY SHAPED PORTION OF THE SECOND MOULD, THE AEROFOIL PORTION EXTENDING INTO SAID SECOND MIXTURE, HOT PRESSING THE SECOND MIXTURE TO FORM THE SHROUD PORTION AND TO AMALGAMATE THE SHROUD PORTION WITH THE AEROFOIL PORTION.
Claim 3
Dependent Claim 80 words
A method as claimed in claim 1 in which the bladed member has two shroud portions, an inner shroud and an outer shroud portion, the second mould having two suitably shaped portions, the method including the steps of placing pre-determined quantities of said second powder mixture in the two suitably shaped portions of the second mould, hot pressing the second powder mixture to form the inner and outer shroud portions and to amalgamate said shroud portions with the aerofoil portion.
Claim 4
Dependent Claim 40 words
A method as claimed in claim 1 in which a portion of at least one of said two shroud portions is pre-formed by hot pressing a mixture of silicon nitride powder and a fluxing agent in a suitably shaped mould.
Claim 5
Dependent Claim 29 words
A method as claimed in claim 3 in which the mould for the pre-formed shroud portion is formed so that the pre-formed shroud portion is formed with fixing means.
Claim 6
Dependent Claim 23 words
A method as claimed in claim 1 in which the second powder mixture is lightly compacted at normal temperature prior to hot pressing.

References Cited (Backward Citations)

US3151994A Cited
US3409417A Cited
US3342917A Cited
US3574805A Cited
US3484512A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-04-07 1978-10-07 1979-04-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-04-07 1982-10-07 1983-04-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-04-07 1986-10-07 1987-04-08 $7700.00 Window Closed / Lapsed

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