Formation of Ultra-High Temperature Ceramic Hollow Microspheres as Promising Lightweight Thermal Insulation Materials via a Molten Salt-Assisted Template Method

2021 ◽  
Author(s):  
Kai Zhao ◽  
Fang Ye ◽  
Laifei Cheng ◽  
Jie Zhou ◽  
Yucong Wei ◽  
...  
Keyword(s):  
High Temperature ◽  
Molten Salt ◽  
Thermal Insulation ◽  
Hollow Microspheres ◽  
Template Method ◽  
Insulation Materials ◽  
Ultra High Temperature

ZIRCONIA FIBERS AS A COMPONENT OF HIGH TEMPERATURE THERMAL INSULATION (review)

2021 ◽  
pp. 79-86
Author(s):  
V.G. Babashov ◽  
◽  
N.M. Varrik ◽  
Keyword(s):  
High Temperature ◽  
Thermal Insulation ◽  
Zirconium Oxide ◽  
Thermal Protection ◽  
Sol Gel ◽  
Precursor Solution ◽  
Technical Literature ◽  
Thermal Protection Systems ◽  
Insulation Materials ◽  
Protection Systems

Based on the analysis of recent publications of scientific and technical literature, data on the production of zirconium oxide fibers used for the manufacture of high-temperature thermal insulation materials are presented. Information is provided on various methods of obtaining zirconium oxide fibers (methods of impregnation of the template and molding of the mixture, sol-gel method of spinning a fiber-forming precursor solution), as well as on the technique of fiber molding (manual pulling, dry and wet spinning, blowing and electrospinning). The use of such fibers for the production of thermal insulation materials (felts, cords and blocks) instead of currently existing materials made of aluminum oxide-based fibers can significantly increase the operating temperatures of the thermal protection systems.

High Temperature Micro Structural Evolution of ZrO2 Fibers Thermal Insulation Materials

2014 ◽  
Vol 602-603 ◽  
pp. 319-322 ◽  
Author(s):  
Guang Hai Wang ◽  
Hao Ran Sun ◽  
Chun Peng Wang ◽  
Jian Zhou ◽  
Yan Li Huo ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Mechanical Property ◽  
High Temperature ◽  
Thermal Insulation ◽  
Thermal Protection ◽  
Structural Evolution ◽  
High Strength ◽  
Insulation Materials ◽  
High Temperature Heat Treatment ◽  
Xrd Patterns

Yttria-stabilized zirconia fibers thermal insulation materials may be the main developmental direction of high temperature thermal protection materials, due to their high temperature resistance (above 2000 °C), high strength and toughness, low thermal conductivity ( about 2 W/m·K), oxidation resistance and other excellent properties. However, mechanical property of zirconia fibers thermal insulation materials is decrease after high temperature heat treatment. In this paper, the evolution of microscopic structure of zirconia fibers is studied by using the method of oxyacethlene ablation. The gain growth and high temperature creep are observed after 600 s heat treatment at 1800 °C. Crystal phase of zirconia fibers is not changed and still cubic. Moreover, crystallinity is more higher form XRD patterns. Controlling grain growth can improve high temperature mechanical property of zirconia fibers thermal insulation materials.

Flexible, High Temperature Thermal Insulation Materials for Subsea Wellhead and Production Equipment

2002 ◽  
Author(s):  
Dwight Janoff
Keyword(s):  
High Temperature ◽  
Thermal Insulation ◽  
Oil And Gas ◽  
Cold Water ◽  
Production Systems ◽  
Tensile Elongation ◽  
Hydrate Formation ◽  
Production Equipment ◽  
Bond Line ◽  
Insulation Materials

As oil and gas wells are being drilled in deepwater, hydrate formation in the well has become a major concern. During a production shut down, gas hydrates can form and plug the bore of a subsea tree, tree piping, jumper, manifold and flow lines. During shut downs, hot produced fluids become stagnant and are cooled by the surrounding cold water, resulting in hydrate formation [1]. Thermal insulation is necessary to slow down this cooling process to prevent hydrate formation until the well production or hydrate inhibitor injection can be restored [2]. Currently available insulation materials for subsea applications are rated for internal temperatures of up to 121 °C (250 °F). These materials include NovoTherm, urethanes, and epoxy/syntactic foams, and vulcanized rubbers [3]. These materials may thermally age at above 121 °C (250 °F) such that the insulation bond line will become weakened or softened over time. Recently, insulation that will withstand 177 °C (350 °F) internal temperatures for high temperature, high pressure (HTHP) projects are being required by operators. Two new insulation materials, proposed for use on subsea wellhead and production systems at temperatures up to 177 °C (350 °F) will be discussed. The first material is based on addition cured silicone elastomer. The second material is based on a flexible Novolac epoxy. Both materials are cast in place into molds, have high tensile elongation, and possess the thermal properties necessary to meet cool down requirements for subsea production equipment. These materials are being proposed for use on manifolds, jumpers, production trees, and other subsea equipment.

scholarly journals Fabrication of a Novel MgO-B2O3-SiO2-Zn Coating by Thermal Spraying

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 907
Author(s):  
Zhan Yu ◽  
Bo Song ◽  
Ping Ma ◽  
Wenhui Fan ◽  
Enzhong Gong ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Insulation ◽  
Thermal Spraying ◽  
Flame Spraying ◽  
Maintenance Cost ◽  
Insulation Layer ◽  
Ceramic Powders ◽  
Insulation Materials ◽  
Automotive Technology ◽  
Insulation Performance

In automotive technology, the proper use of thermal insulation materials helps improve the performance and life of internal equipment and reduce maintenance cost. In this study, plasma spraying and flame spraying are used to prepare and coat a new MgO-B2O3-SiO2-Zn powder on the SUS304 substrate. The resulting coating as thermal insulation layer formed a networked microstructure between the substrates to improve the thermal insulation performance of the material. By validation of thermal radiation experiments, the thermal insulation effects of various ceramic powders were compared, the high-temperature and low-temperature thermal insulation materials for about 300 and 100 °C were determined, and the thermal insulation performance of the constructed material coatings was verified by analysis.

scholarly journals Thermal insulation for a high temperature molten salt storage tank in a CSP plant

2020 ◽  
Author(s):  
Soheila Riahi ◽  
Ming Liu ◽  
Rhys Jacob ◽  
Martin Belusko ◽  
Craig Turchi ◽  
...  
Keyword(s):  
High Temperature ◽  
Molten Salt ◽  
Thermal Insulation ◽  
Storage Tank

Pore Forming Mechanism of Forsterite Insulation Materials Synthesized by Molten Salt Method

2016 ◽  
Vol 697 ◽  
pp. 134-137
Author(s):  
Yun Fei Song ◽  
Cheng Ji Deng ◽  
Hong Xi Zhu ◽  
Jun Ding
Keyword(s):  
High Temperature ◽  
Molten Salt ◽  
Pore Diameter ◽  
Molten Salt Method ◽  
Liquid Environment ◽  
Curved Space ◽  
Forming Mechanism ◽  
Insulation Materials ◽  
Carbonate Decomposition

Abstract. The forsterite thermal insulation materials were synthesized by molten salt method with forsterite and NaCl-Na2CO3 salt, sintered at 1000°C, 1050 °C, 1100°C and 1150°C respectively. Studying complex pore structures is the key to understand the mechanism of pore-forming. The mechanism of the variation in the heterogeneous pore structure was analyzed based on differential thermal analysis, thermogravimetry, high-pressure mercury intrusion porosimetry and scanning electron microscope. The results show that the NaCl-Na2CO3 salt play the role of promoting sintering in liquid environment at high temperature as well as forming pore as placeholder. The mechanism of pore-forming contains three parts: the pores < 6.6 μm are mainly formed by sodium carbonate decomposition under high temperature and vapor pressure; the forming way of 6.6~66μm derives from carbonate decomposition and salt evaporate jointly; The salt stay in the slender and curved space shaped by the rearrangement of forsterite particles, forms the pore diameter of > 66 μm after salt dissolves in water.

RESEARCH OF THE UNEVENNESS OF DISTRIBUTION OF THE STRENGTH PROPERTIES OF HIGH-TEMPERATURE THERMAL INSULATION MATERIALS

2021 ◽  
pp. 123-134
Author(s):  
V.G. Babashov ◽  
◽  
V.V. Butakov ◽  
S.G. Kolyshev ◽  
V.G. Maksimov ◽  
...  
Keyword(s):  
High Temperature ◽  
Comparative Study ◽  
Thermal Insulation ◽  
Solid Phase ◽  
Strength Properties ◽  
Insulation Material ◽  
Protective Material ◽  
Thermal Insulation Material ◽  
Insulation Materials ◽  
Fibrous Heat

The article considers the results of the study of the uneven distribution of the strength properties of a rigid high-temperature fibrous heat-protective material over the volume of the block. The article presents a comparative study of the uneven strength of two materials that differ in the method of introducing the binder. A conclusion is proposed about the mechanism of the occurrence of unevenness of the strength properties of a rigid fibrous thermal insulation material when a soluble binder is introduced into the material by the strait method. The absence of such a mechanism is shown for materials obtained using a solid-phase binder introduced into the molding hydraulic mass.

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