公开(公告)号：US20180134418A1

公开(公告)日：2018-05-17

申请号：US15813997

申请日：2017-11-15

Applicant: UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF NASA

Inventor： John-Andrew S. Hocker ,  Cheol Park ,  Sang-Hyon Chu ,  Jin Ho Kang ,  Catharine C. Fay

IPC: B64G1/62 ,  C01B21/064

CPC classification number: B64G1/62 ,  B64G2001/224 ,  C01B21/064 ,  C01P2004/13 ,  C01P2006/37

Abstract: A lightweight flexible BNNT mat or fabric provides improved thermal stability and shielding capabilities under a hypersonic thermal flux. The BNNT mat reduces the stagnation temperature and maintains a low regression rate. An in-situ passivation layer may be formed on the BNNT mat or fabric under high thermal flux. The passivation layer minimizes or prevents penetration of the atmosphere (air or gas) as well as heat and radiation through the thickness of the BNNT material, and it effectively diffuses heat throughout the mat or fabric laterally and radially to minimize localized excessive heat. A BNNT mat according to the present disclosure may also efficiently transfer heat from the BNNT material via radiation due to the high thermal emissivity (0.92) of the BNNT material.

公开(公告)号：US11980100B2

公开(公告)日：2024-05-07

申请号：US17374091

申请日：2021-07-13

Applicant: UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF NASA

Inventor： Sang H. Choi ,  Hyun Jung Kim ,  Adam J. Duzik ,  Cheol Park

IPC: H10N10/854 ,  H10N10/01 ,  H10N10/17

CPC classification number: H10N10/854 ,  H10N10/01 ,  H10N10/17

Abstract: A metal junction thermoelectric device includes at least one thermoelectric element. The thermoelectric element has first and second opposite sides, and a first conductor made from a first metal, and a second conductor made from a second metal. The first and second conductors are electrically interconnected in series, and the first and second conductors are arranged to conduct heat in parallel between the first and second sides. The first metal has a first occupancy state, and the second metal has a second occupancy state that is lower than the first occupancy state. A temperature difference between the first and second sides of the thermoelectric element causes a charge potential due to the difference in occupancy states of the first and second metals. The charge potential generates electrical power.

公开(公告)号：US10934028B2

公开(公告)日：2021-03-02

申请号：US15813997

申请日：2017-11-15

Applicant: UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF NASA

Inventor： John-Andrew S. Hocker ,  Cheol Park ,  Sang-Hyon Chu ,  Jin Ho Kang ,  Catharine C. Fay

IPC: B64G1/62 ,  C01B21/064 ,  B64G1/22

Abstract: A lightweight flexible BNNT mat or fabric provides improved thermal stability and shielding capabilities under a hypersonic thermal flux. The BNNT mat reduces the stagnation temperature and maintains a low regression rate. An in-situ passivation layer may be formed on the BNNT mat or fabric under high thermal flux. The passivation layer minimizes or prevents penetration of the atmosphere (air or gas) as well as heat and radiation through the thickness of the BNNT material, and it effectively diffuses heat throughout the mat or fabric laterally and radially to minimize localized excessive heat. A BNNT mat according to the present disclosure may also efficiently transfer heat from the BNNT material via radiation due to the high thermal emissivity (0.92) of the BNNT material.