Daniel S. Schwartz - University City MO Donald A. Deuser - Florissant MO Rick L. Martin - St. Peters MO
Assignee:
McDonnel & Douglas Corporation - St. Louis MO
International Classification:
B23K 2002 B23K 20233
US Classification:
228190
Abstract:
A novel method of forming low density core metal parts by pressure bonding face sheets to a porous foam metal core and simultaneously densifying the core is disclosed. In particular, low density core aluminum and aluminum alloy parts can be formed according to the method of the invention. The method of forming low density core metal parts generally comprises the steps of providing a porous, foam metal core and simultaneously pressure bonding first and second solid metal face sheets directly to opposite sides of the core and densifying the core by applying heat and uniaxial forge pressure to the first and second face sheets and to the core for a predetermined period of time. The method of the invention can therefore produce LDC parts having a predetermined shape and density. Furthermore, the LDC parts are less subject to interfacial oxidation and delamination than conventional LDC parts made by brazing.
Daniel S. Schwartz - University City MO Donald A. Deuser - Florissant MO
Assignee:
The Boeing Company - St. Louis MO
International Classification:
B23K 2000 B23K 2800 B23K 3102 C22B 100 C22B 114
US Classification:
2282351
Abstract:
The present invention provides a method of diffusion bonding a first article containing a thermally activated expansion agent to a second article. The first article and the second article are placed adjacent to each other at a bonding area. The first article and the second article are constrained such that contact is maintained between the first article and the second article at the bonding area. The constrained articles are then heated at a temperature that causes the first article to expand, creating pressure between the articles at the bonding area.
David Michael Bowden - St. Louis MO Donald Albert Deuser - Florissant MO
Assignee:
McDonnell Douglas
International Classification:
C22C 109 B32B 502
US Classification:
428608
Abstract:
A titanium matrix composite laminate (42) includes alternating layers of a titanium matrix foil (12) and a fiber mat (14). The titanium matrix foil (12) is formed from a super alpha titanium alloy having a beta phase stabilizer equivalency of at least thirteen. The beta phase stabilizer is selected from the elements molybdenum, vanadium, niobium, tantalum, halfnium, tungsten or some combination thereof. The fiber mat (14) is formed of silicon carbide (SiC) and has a carbon coating. Once a layup (16) of the alternating layers is formed, it is placed in a mold (22). Heat and pressure are then applied in a step called consolidation (40). The result is a titanium matrix composite laminate (42).
Expanded Metal Structure And Method Of Making Same
Christopher S. Huskamp - Columbia IL Donald A. Deuser - Florissant MO Daniel S. Schwartz - University City MO
Assignee:
McDonnell Douglas Corporation - St. Louis MO
International Classification:
B22F 300
US Classification:
428547
Abstract:
The present invention provides a method of forming a continuous one-piece structural porous metal (SPM) structure having a predetermined geometry. The method the invention includes the steps of preparing a metal billet comprising a metal core formed of a metal and a gas, and solid metal face sheets bonded to opposite sides of the metal core; placing the metal billet in a mold cavity having a predetermined geometry defined by opposing inner surfaces of the mold with at least one of the opposing inner surfaces contacting at least a portion of the metal billet and spaced apart from at least a portion of the metal billet; and heating the metal billet to expand the metal core to form the expanded metal structure. The portion of the metal billet in contact with the inner surfaces of the mold cavity is constrained by these surfaces while the remainder of the metal billet that is spaced apart from at least one of the inner surfaces of the mold is allowed to expand resulting in a one-piece expanded metal structure having a geometry corresponding generally to the geometry of the mold cavity with the constrained portion of the metal structure having a higher density than the remainder of the expanded metal structure. The present invention also includes a continuous one-piece expanded metal structure.
Two-Step Brazing Process For Joining Materials With Different Coefficients Of Thermal Expansion
James L. McAfee - Ferguson MO Donald A. Deuser - Florissant MO John T. Niemann - O'Fallon MO Daniel S. Schwartz - U-City MO
Assignee:
McDonnell Douglas Corporation - St. Louis MO
International Classification:
B23K 120
US Classification:
2281241
Abstract:
A two-step process for joining a first part to a second part, the first part having a coefficient of thermal expansion lower than the coefficient of thermal expansion of the second part. An anchor layer is then brazed at a lower temperature to the first part having a high thermal expansion coefficient. The anchor layer has a thickness such that upon cooling it will yield to relieve stress build up resulting from the differing thermal expansion coefficients between it and the first part. The anchor layer is then brazed to the part having a high thermal expansion coefficient. The process is particularly useful for joining carbon-carbon composite parts to copper substrates for use in the manufacture of high temperature heat exchangers as used, for example, in nuclear fusion reactors.
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