Agency: National Aeronautics and Space Administration | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 124.99K | Year: 2014
Sealing glasses, either rigid glass-ceramics or viscous, non-crystallizing compositions, will be developed and sealing processes will be optimized based on NASA's solid oxide fuel cell (SOFC) designs. SOFC design constraints, including material selection and operational conditions, will guide compositional development, and then these new compositions will be used for long-term (>500 hours) material compatibility tests under SOFC operational conditions. Prototype seals will be produced and will be thermally cycled between room temperature and 850�C to test the thermo-mechanical compatibility of the sealing materials with SOFC components. At the end of this Phase I project, sealing compositions and processes will be identified for SOFC applications identified by NASA.
Agency: Department of Energy | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 149.98K | Year: 2014
Most liquid high-level nuclear waste is currently being immobilized to a solid form as a borosilicate glass by vitrification. However, many nuclear wastes have complex and diverse chemical compositions that reduce their compatibility with borosilicate glass. The current baseline spent nuclear fuel reprocess generates secondary waste streams that generally include large amounts of MoO3 and lanthanides that are poorly soluble in borosilicate glasses and thereby limit the waste loading. New waste forms as alternatives to borosilicate glass are being sought to increase the waste loading while retaining acceptable chemical durability and thus to decrease the total nuclear waste volume required for storage and disposal. The main goal of the proposed nine month, SBIR Phase I program is to develop suitable iron phosphate-based compositions for vitrifying the MoO3-rich waste generated from reprocessed spent nuclear fuel with greater waste loadings than can presently be achieved with borosilicate glass and while retaining chemical durability that meets or exceeds appropriate DOE standards. Our previous studies have already demonstrated proof-of- concept for molybdenum solubility in an iron phosphate glass. During the Phase I program, we will formulate iron phosphate compositions to develop advanced waste forms, which can contain larger amounts ( & gt;40 wt%) of the MoO3-rich waste, compared to a borosilicate glass, while demonstrating (1) a good glass forming tendency, (2) moderate/practical melting and forming temperatures ( & lt;1200C), and (3) acceptable waste form properties, especially a chemical durability meeting the Product Consistency Test (PCT) requirements. Commercial Applications and Other Benefits: The proposed research will demonstrate that iron phosphate waste forms will increase radioactivity concentrations that can be safely stored and thereby decrease the total nuclear waste volume for storage and disposal. This would lead to considerable savings of time and money for the Nations effort related to nuclear waste remediation, something that is especially needed for the advanced domestic fuel cycle program.
MO-SCI Corporation | Date: 2015-08-31
This invention relates to low density radioactive magnesium-aluminum-silicate (MAS) microparticles for radiotherapy and/or radioimaging.
MO-SCI Corporation | Date: 2014-10-21
This invention relates to a method for making strontium-phosphate microparticles that incorporate radioisotopes for radiation therapy and imaging.
Agency: Department of Energy | Branch: | Program: STTR | Phase: Phase I | Award Amount: 149.95K | Year: 2014
Solid oxide fuel cells (SOFCs) require robust seals that can prevent intermixing of air and fuel, remain inert in reducing and oxidizing environments while in contact with SOFC materials, and maintain their effectiveness through repeated thermal cycles. Recent research has focused on compliant (or viscous) glasses that remain vitreous over time in the SOFC stack operating environment, and are able to tolerate relative motion between the surfaces being sealed without the development of permanent leaks. Certain glasses (under investigation by MO-SCI and others) considered for this sealing application have broadly desirable thermo-mechanical properties and thermo-chemical characteristics, but have been found to chemically react with both bare and aluminized stainless steel SOFC interconnects, consequently forming phases that may adversely affect the integrity of the seal. On the other hand, these glasses do not react with the yttria-stabilized zirconia (YSZ) electrolyte used in most SOFC designs. Thus, YSZ could be an attractive barrier layer between the metallic SOFC interconnect and the sealing glass. The main goal of the proposed nine month, STTR Phase I program is to develop a dense and well-bonded YSZ coating on an SOFC interconnect alloy. The coating method proposed in this project utilizes the two-step YSZ powder/polymer process that has successfully deposited YSZ coatings on SOFC electrodes. This two-step YSZ infiltration method does not require special equipment such as plasma or laser deposition source, and the process can be scaled up and is suitable for coating larger and more complex surfaces. Our preliminary studies have already demonstrated proof-of- concept. During the Phase 1 program, we will (1) determine the relationships between processing parameters and the YSZ coating thickness; (2) determine how these processing conditions affect the interactions between the YSZ coatings and the viscous sealing glass; and (3) characterize the long-term interfacial reactions between optimized coating and the underlying stainless steel as well as the viscous sealing glass. Commercial Applications and Other Benefits: This STTR project will assist the nations SOFCs program in meeting its cost and performance targets by ensuring a stable barrier layer between SOFC interconnects and seals, and consequently achieving reliable seal operation over an extended operating life. The program will ultimately enable fuel cell-based near-zero emission coal plants with greatly reduced water requirements and the capability of capturing 97 percent or greater of carbon at costs not exceeding the typical cost of electricity available today. Achieving this goal will significantly impact the nation given the size of the market, expected growth in energy demand, and the age of the existing power plant fleet. It will also provide the technology base to enable grid-independent distributed generation applications.