Engineering topics

Schroeder, J. E.

Publications and source records attributed to Schroeder, J. E..

8 records

NASA NTRS1988

Oxygen separation from air using zirconia solid electrolyte membranes

Air separation using a zirconia solid electrolyte membrane is a possible alternative source of oxygen. The process of zirconia oxygen separation is reviewed, and an oxygen plant concept using such separation is described. Potential cell designs, stack designs, and testing procedures are examined. Fabrication of the materials used in a zirconia module as well as distribution plate design and fabrication are examined.

Suitor, J. W.↗

NASA NTRS1985

Lightweight Electrical Insulation

Hollow plastic spheres expanded and fused together. Hollow, gasfilled plastic spheres piled in mold. Heating in vacuum softens and expands spheres, forcing them together into nearly regular hexagonal close packing. Foam used as lightweight, electrically insulating material in place of solid ceramic, glass, or polymer. Padding to protect against mechanical shocks another application for such dense, regular foam.

Schroeder, J. E.↗

NASA NTRS1985

Ceramic Coatings for Engine Parts

In manufacturing concept, dense, nonporous ceramic coatings applied to metal parts by plasma spraying. Coatings improve resistance of parts to corrosion and erosion in turbines and other engines. Plasma spraying faster and cheaper than previously used method, vapor deposition, and used on large parts as well as small ones.

Schroeder, J. E.↗

NASA NTRS1985

Shielding Against Intense Laser Beams

Multiple-layer shielding proposed to protect equipment against damage by intense infrared laser beams. New shielding concept reduces effect of destructive phase changes upon reflectance by allowing exposure of additional reflecting layers after overlaying layers vaporized.

Schroeder, J. E.↗

NASA NTRS1985

Stabilized Aluminum Titanate

Stable, potentially-inexpensive, cubic crystalline alpha aluminum titanate that shows no phase change to 1,700 K used in heat exchangers. Particular stabilizing species must be selected with careful attention to crystal dimensions and bond angles of alpha and beta phases of aluminum titanate.

Schroeder, J. E.↗

NASA NTRS1983

Absorbable-susceptor joining of ceramic surfaces

An assembly of ceramic surfaces particularly refractory metal oxides and carbides, abutting a thin sheet of metal susceptor material are placed in a chamber of an enclosure containing inert gas. An RF coil is activated by power supply to melt the susceptor and adjacent zones of the ceramic. Reactive gas such as oxygen or a carbonizing gas is then fed to the chamber and reacts with the susceptor to form compounds which disperse and dissolve in the zones. On cooling, a strong joint is formed. The susceptor may contain inner perforations and outer perforations to aid in distribution of heat.

Schroeder, J. E.↗

NASA NTRS1983

Absorbable-Susceptor Welding of Ceramics

Susceptor becomes part of joint. Susceptor is heated to high temperature by RF energy, then melts adjacent ceramic material. Susceptor dissolves in molten ceramic. When cooled, ceramic parts form moloithic assembly. Suitable for joining complex subassemblies in heat exchangers or other ceramic process equipment for high temperatures.

Schroeder, J. E.↗

NASA NTRS1981

An advanced, radiation hardened bulk CMOS/LSI technology

An advanced, second generation, bulk, Si-gate CMOS process is described. This process is capable of producing LSI and VLSI parts that are latch-up free and hardened to total dose levels in excess of 2 x 10 to the 5th rad-Si for applications in space and weapons radiation environments. Two memories designed to use this process are also described. Both circuits are 4096-bit, static CMOS RAMs.

Schroeder, J. E.↗