Bonding of thermal tile insulation

• US 6,494,979 B1
• Filed: 09/29/2000
• Issued: 12/17/2002
• Est. Priority Date: 09/29/2000
• Status: Expired due to Term

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: DiChiara, Robert A. Jr.
• Primary Examiner(s): MAYES, MELVIN C
• Application Number:
  US09/676,682
• Time in Patent Office: 809 Days
• Field of Search: 156/89.11, 156/258, 156/295
• US Class Current: 156/89.11
• CPC Class Codes: C04B 2235/3206 Magnesium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3217 Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
• CPC Class Codes: C04B 2235/3418 Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
• CPC Class Codes: C04B 2235/3481 Alkaline earth metal alumino-silicates other than clay, e.g. cordierite, beryl, micas such as margarite, plagioclase feldspars such as anorthite, zeolites such as chabazite
• CPC Class Codes: C04B 2235/5228 Silica and alumina, including aluminosilicates, e.g. mullite
• CPC Class Codes: C04B 2235/5232 Silica or silicates other than aluminosilicates, e.g. quartz
• CPC Class Codes: C04B 2237/062 based on silica or silicates
• CPC Class Codes: C04B 2237/10 Glass interlayers, e.g. frit or flux
• CPC Class Codes: C04B 2237/38 Fiber or whisker reinforced
• CPC Class Codes: C04B 35/6264 Mixing media, e.g. organic solvents
• CPC Class Codes: C04B 35/63 using additives specially adapted for forming the products , e.g.. binder binders
• CPC Class Codes: C04B 35/634 Polymers C04B35/636 takes precedence
• CPC Class Codes: C04B 35/63424 Polyacrylates; Polymethacrylates
• CPC Class Codes: C04B 35/63452 Polyepoxides
• CPC Class Codes: C04B 35/636 Polysaccharides or derivatives thereof
• CPC Class Codes: C04B 35/80 Fibres, filaments, whiskers, platelets, or the like
• CPC Class Codes: C04B 37/005 consisting of glass or ceramic material
• CPC Class Codes: Y10T 156/1066 Cutting to shape joining edge surfaces only
• CPC Class Codes: Y10T 428/19 Sheets or webs edge spliced or joined
• CPC Class Codes: Y10T 428/195 Beveled, stepped, or skived in thickness
• CPC Class Codes: Y10T 428/237 : Noninterengaged fibered material encased [e.g., mat, batt, etc.]

Abstract

An insulative body having first and second porous insulation members and a ceramic binder. Each of the first and second porous insulation members is formed of a fibrous, low-density silica-based material and cooperatively defines a joint. The ceramic binder is disposed between a pair of mating surfaces that form the joint. The ceramic binder couples the first and second porous insulation members together. A method for bonding insulative bodies to one another through the use of an ceramic/organic thermal setting binder is also provided.

Claims

1. A method for coupling a first porous insulation member to a second porous insulation member, each of the first and second porous insulation members being formed of a fibrous, low-density silica-based material, the method comprising the steps of:

providing a ceramic/organic thermal setting binder having a thermal set organic binder and a ceramic binder selected from a group of binders consisting of glass and ceramic;

applying the ceramic/organic thermal setting binder between a pair of mating surfaces formed into the first and second porous insulation members;

heating the first and second porous insulation members to a first predetermined temperature to cause the thermal set ceramic/organic binder to distribute the binder through a joint formed by the mating surfaces of the first and second porous insulation members and thereafter cure the organic binder to form a bonded joint;

heating the bonded first and second porous insulation members to a second predetermined temperature to burn out the thermal set organic binder; and

firing the bonded first and second porous insulation members at a third predetermined temperature to cause the ceramic binder to fixedly couple the mating surfaces of the first and second porous insulation members to one another.

2. The method of claim 1, wherein before the step of applying the ceramic/organic thermal setting binder, the method includes the steps of:

providing a surface hardening agent in a liquid carrier;

applying the surface hardening agent to at least one of the pair of mating surfaces; and

curing the surface hardening agent that has been applied to the at least one of the mating surfaces.

3. The method of claim 2, wherein the surface hardening agent is selected from a group of surface hardening agents consisting of silica sol and alumina sol.

4. The method of claim 3, wherein before the step of applying the surface hardening agent, the method further comprises the steps of:

providing a pore-obstructing material;

applying the pore-obstructing material to the at least one of the mating surfaces to thereby limit a depth with which the surface hardening agent is permitted to penetrate.

5. The method of claim 4, wherein the pore-obstructing material is selected from a group of pore-obstructing materials consisting of cordierite and mullite.

6. The method of claim 1, wherein before the step of applying the ceramic/organic thermal setting binder, the method includes the steps of:

providing a solvent; and

employing the solvent to, adjust a viscosity of the ceramic/organic thermal setting binder.

7. The method of claim 1, wherein the first predetermined temperature is about 180°

F. to about 400°

F.

8. The method of claim 1, wherein the second predetermined temperature is about 800°

F. to about 1000°

F.

9. The method of claim 1, wherein the third predetermined temperature is about 1200°

F. to about 2400°

F.

10. The method of claim 1, wherein before the step of providing the ceramic/organic thermal setting binder, the method includes the step of mitering an end portion of each of the first and second porous insulation members.

11. The method of claim 10, wherein the ceramic binder includes aluminum oxide and silica.

12. The method of claim 1, wherein the ceramic binder includes about 0 percent by weight to about 90 percent by weight of aluminum oxide and about 100 percent by weight to about 10 percent by weight of silica.

13. The method of claim 12, wherein the ceramic binder includes about 83 percent by weight of aluminum oxide and about 16 percent by weight of silica.

14. The method of claim 12, wherein the ceramic/organic thermal setting binder includes about 90 percent by weight of the ceramic binder and about 10 percent by weight of an epoxy.

15. The method of claim 1, wherein the ceramic/organic thermal setting binder includes about 90 percent by weight of glass and about 10 percent by weight of acrylic.

16. The method of claim 1, wherein the ceramic/organic thermal setting binder includes about 95 percent by weight of glass and about 5 percent by weight of ethocellulose.