# US 10,371,467 B2 · Heat exchanger with variable thickness coating > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,371,467 B2 - Document ID: US10371467B2 - Status: Granted - Kind: B2 - Application number: 13/857,245 - Filed: 2013-04-05 - Published: 2014-06-05 - Granted: 2019-08-06 - Earliest claimed: 2012-12-05 - Assignees: Hamilton Sundstrand Corporation - Applicants: Hamilton Sundstrand Corporation - Inventors: Marc E. Gage; Jeffrey A. Scarcella; Kurt L. Stephens; Matthew Patterson - Web page: https://patentgrep.com/patent/US10371467B2 ## CPC - F28F 19/02: by using coatings, e.g. vitreous or enamel coatings - F28D 9/00: Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall {(F28F3/083, F28F3/086 take precedence)} - F28D 2021/0021: {for aircrafts or cosmonautics} - F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16) - F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general) ## Abstract A heat exchanger includes a heat exchanger wall that bounds a passage. A coating lines the heat exchanger wall. The coating has a thickness that varies according to location on the heat exchanger wall. ## Claims ### Claim 1 A heat exchanger comprising: a first plate; a second plate; a heat exchanger wall bounding a passage, wherein the wall is a fin separating the first plate and the second plate; and a coating lining the heat exchanger wall, the coating having a thickness that varies according to location on the heat exchanger wall, wherein the heat exchanger wall has an edge and a location spaced from the edge, the coating is thicker at the edge than at the location spaced from the edge, wherein the coating has a maximum thickness of T1 and a minimum thickness of T2 such that a ratio of T1/T2 (T1 divided by T2) is equal to or greater than 2, and the edge is a leading edge with respect to the passage being arranged to receive a flow of a fluid. ### Claim 2 (depends on 1) The heat exchanger as recited in claim 1, wherein the coating is organic. ### Claim 3 (depends on 1) The heat exchanger as recited in claim 1, wherein the coating is an epoxy-based coating. ### Claim 4 (depends on 1) The heat exchanger as recited in claim 1, wherein the heat exchanger wall has a second edge opposite the edge, the location is spaced from the second edge, the coating is thicker at the second edge than at the location, and the second edge is a trailing edge with respect to the passage being arranged to receive a flow of a fluid. ### Claim 5 (depends on 1) The heat exchanger as recited in claim 1, wherein the coating has a maximum thickness at the leading edge. ### Claim 6 (depends on 1) The heat exchanger as recited in claim 1, wherein the coating has a gradual transition between a maximum thickness location and a minimum thickness location. ### Claim 7 (depends on 1) The heat exchanger as recited in claim 1, wherein the ratio is from 3 to 7. ### Claim 8 (depends on 1) The heat exchanger as recited in claim 1, wherein the ratio is 10 or greater. ### Claim 9 (depends on 1) The heat exchanger as recited in claim 1, wherein the maximum thickness T1 is greater than or equal to 25.4 micrometers. ### Claim 10 (depends on 9) The heat exchanger as recited in claim 9, wherein the maximum thickness T2 is greater than or equal to 2.54 micrometers. ### Claim 11 (depends on 1) The heat exchanger as recited in claim 1, comprising an inlet face; and an exit face, wherein the inlet face comprises the leading edge. ### Claim 12 A heat exchanger comprising: a first plate; a second plate; an inlet face arranged to receive ram air; an exit face opposed from the inlet face; a plurality of heat exchanger walls extending between the inlet face and the exit face, the plurality of heat exchanger walls defining a plurality of passages that open at respective leading edges at the inlet face and at respective trailing edges at the exit face, wherein the plurality of heat exchanger walls are fins separating the first plate and the second plate; and a coating lining the plurality of heat exchanger walls, the coating having a thickness that varies according to location on the plurality of heat exchanger walls, wherein the coating has a maximum thickness at the leading edges, wherein the coating has a maximum thickness of T1 and a minimum thickness of T2 such that a ratio of T1/T2 (T1 divided by T2) is equal to or greater than 2. ### Claim 13 (depends on 12) The heat exchanger as recited in claim 12, wherein the plurality of heat exchanger walls are metallic and the coating is organic.