Multilayer braze tape

Patent metadata

Field	Value
Publication number	US-10335877-B2
Application number	US-201615002182-A
Country	US
Kind code	B2
Filing date	Jan 20, 2016
Priority date	Jan 21, 2015
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A method may include positioning a multilayer braze tape at a joint between a first part comprising a ceramic or CMC and a second part comprising at least one of a ceramic, a CMC, a metal, or an alloy. The multilayer braze tape may include at least one layer comprising a silicon-containing braze material and at least one layer comprising a reinforcement material. The method also may include applying pressure to compress the multilayer braze tape between the first part and the second part, and heating the multilayer braze tape to melt the silicon-containing braze material and join the first part and the second part.

First claim

What is claimed is:

1. A method comprising:
positioning a multilayer braze tape at a joint between a first part comprising a ceramic or ceramic matrix composite (CMC) and a second part comprising at least one of a ceramic, a CMC, a metal, or an alloy, wherein the joint is defined by a first joint surface of the first part and a second joint surface of the second part, and wherein the multilayer braze tape comprises:
at least one layer comprising a silicon metal- or silicon alloy-containing braze material; and
at least one layer comprising a reinforcement material;

applying pressure to compress the multilayer braze tape between the first joint surface of the first part and the second joint surface of the second part; and
heating the multilayer braze tape to melt the silicon metal or the silicon alloy in the silicon metal- or silicon alloy-containing braze material and join the first part and the second part without introducing molten material from outside the joint during the brazing technique.

2. The method of claim 1 , wherein the multilayer braze tape comprises:
a first layer comprising the silicon metal- or silicon alloy-containing braze material;
a second layer comprising the silicon metal- or silicon alloy-containing braze material; and
a third layer comprising the reinforcement material, wherein the third layer is between the first layer and the second layer.

3. The method of claim 1 , wherein the reinforcement material comprise silicon carbide.

4. The method of claim 1 , wherein the at least one layer comprising the reinforcement material further comprises at least one of graphite, carbon black, or diamond.

5. The method of claim 1 , wherein the at least one layer comprising the silicon-containing braze material further comprises an organic binder system, wherein heating the multilayer braze tape to melt the silicon metal- or silicon alloy-containing braze material and join the first part and the second part releases carbon from the organic binder system, and wherein silicon from the silicon metal- or silicon alloy-containing braze material reacts with the carbon to form silicon carbide.

6. The method of claim 1 , wherein the at least one layer comprising the silicon metal- or silicon alloy-containing braze material comprises at least one of silicon metal metal- or silicon alloy-containing particulates or silicon alloy-containing particulates.

7. The method of claim 1 , further comprising:
preheating at least one of the first part or the second part to a temperature between about 900° C. and about 1,000° C. prior to heating the multilayer braze tape to melt the silicon metal- or silicon alloy-containing braze material and join the first part and the second part.

8. The method claim 1 , wherein:
locally heating the multilayer braze tape to melt the silicon metal or silicon alloy in the silicon metal- or silicon alloy-containing braze material and join the first part and the second part comprises heating the multilayer braze tape to a temperature between about 1327° C. and about 1427° C.

9. An assembly comprising:
a first part comprising a ceramic or ceramic matrix composite (CMC) and defining a first joint surface;
a second part comprising at least one of a ceramic, a CMC, a metal, or an alloy and defining a second joint surface, wherein the second part is adjacent to the first part, wherein the first and second joint surfaces define a joint between adjacent portions of the first part and the second part;
a multilayer braze tape positioned at the joint between the adjacent portions of the first part and the second part, wherein the multilayer braze tape comprises:
at least one layer comprising a silicon metal- or silicon alloy-containing braze material; and
at least one layer comprising a reinforcement material; and

at least one braze heat source positioned and configured to locally heat the multilayer braze tape to a temperature between about 1327° C. and about 1427° C. to melt the silicon metal- or silicon alloy-containing braze material and join the first part and the second part, while not directly heating the first part and the second part.

10. The assembly of claim 9 , wherein the multilayer braze tape comprises:
a first layer comprising the silicon metal- or silicon alloy-containing braze material;
a second layer comprising the silicon metal- or silicon alloy-containing braze material; and
a third layer comprising the reinforcement material, wherein the third layer is between the first layer and the second layer.

11. The assembly of claim 9 , wherein the reinforcement material comprises silicon carbide.

12. The assembly of claim 9 , wherein the at least one layer comprising the reinforcement material further comprises at least one of graphite, carbon black, or diamond.

13. The assembly of claim 9 , wherein the at least one layer comprising the silicon-containing braze material further comprises an organic binder system.

14. The assembly of claim 9 , wherein the at least one layer comprising the silicon metal- or silicon alloy-containing braze material comprises at least one of silicon metal-containing particulates or silicon alloy-containing particulates.

Assignees

• Rolls Royce Corp

Inventors

• Ritchey Andrew James
• Landwehr Sean E
• Nelson Scott
• Shim Sungbo

Classifications

• B23K1/00

  Soldering, e.g. brazing, or unsoldering (B23K3/00 takes precedence) · CPC title

• B23K1/0056

  soldering by means of beams, e.g. lasers, electron beams [EB] · CPC title

• B23K1/0008 Primary

  specially adapted for particular articles or work · CPC title

• B23K2103/52

  Ceramics · CPC title

• B23K2103/18

  Dissimilar materials · CPC title