Preparation of Porous Lightweight Ceramics and Fibre Joining Materials

2011 ◽  
Vol 415-417 ◽  
pp. 1038-1041 ◽  
Author(s):  
Ying Na Zhao ◽  
Cai Fen Wang ◽  
Jia Chen Liu ◽  
Hai Xu
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Raw Materials ◽  
Low Cost ◽  
Microwave Sintering ◽  
Porous Ceramics ◽  
Temperature Resistance ◽  
Selective Heating ◽  
Fly Ash Cenosphere ◽  
Ceramics Matrix

The high-temperature resistance compression material of lightweight porous ceramics and fiber joining is becoming a kind of promising seal parts in high-temperature industries and aerospace field. A combination of the lightweight mullite matrix porous ceramics and the elastic 3-D silica woven fibre, a novel joining material was studied. The low cost fly ash cenosphere as raw materials, mullite porous ceramics with density 0.92 g/cm3, and the thermal conductivity 0.13 w/m.K, were prepared. Using microwave selective heating properties, designing the interlayer composition, the bonding materials were attained by microwave sintering. The flexural strength of joint materials was about 23 MPa, which was higher than porous ceramics matrix.

The Development and Application of Non-Shrinking Composite Silicate Insulation Material

2013 ◽  
Vol 772 ◽  
pp. 178-181
Author(s):  
Yong Liang Zhan ◽  
Hai Yang Chen ◽  
Xing Hua Hou ◽  
Fei He
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Production Process ◽  
Thermal Insulation ◽  
Raw Materials ◽  
Drying Shrinkage ◽  
Structural Member ◽  
Insulation Material ◽  
Technical Performance

Non-shrinking composite silicate insulation material has advantages of low drying shrinkage, density, thermal conductivity and good thermal insulation which withstands high temperature and militates in favor of specially shaped structural member construction, etc. This article describes raw materials and the production process of the above material, discusses thermal insulation characteristics, technical performance and the features of use and particularizes the application effect in the project.

Preparation of New Alumina Silicate Refractory Fiberboard and Study on its Performance

2011 ◽  
Vol 236-238 ◽  
pp. 1347-1350 ◽  
Author(s):  
Qing Zhu ◽  
Chuan Shan Zhao ◽  
Jin Jiang Pang
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Matrix Material ◽  
Vacuum Filter ◽  
Molding Process ◽  
Temperature Resistance ◽  
Glue Concentration ◽  
The Matrix ◽  
Cycling Time ◽  
Made In

The preparation of alumina silicate refractory fiberboard by wet vacuum filter molding process, alumina silicate fibre is the matrix material, and high-temperature resistance adhesive is the agglutinant. Experiments made in conditions of no liquid glue, and not adding fiber, influence of cycling time on liquid glue concentration, density of fiberboard, and retention of cementing compound was studied; effect of density of fiberboard on thermal conductivity is also discussed. The results showed that the optimum liquid glue concentration is 9.41%, cycling time is 28h (replenish liquid glue after 28h). Density of alumina silicate fiberboard is 289kg/m3, and alumina silicate fiberboard can resistance to 1200 °C.

Preparation Thermal Insulation Masonry Mortar Using Regeneration Light Sand

2015 ◽  
Vol 768 ◽  
pp. 369-374
Author(s):  
Su Gai Cao ◽  
Pei Xin Li ◽  
Feng Qing Zhao ◽  
Zhi Guo Zhang
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Raw Materials ◽  
Low Cost ◽  
Steel Slag ◽  
Solid Wastes ◽  
Mixture Ratio ◽  
Aerated Concrete ◽  
Optimal Mixture Ratio ◽  
Masonry Mortar

In this paper, ecotype cementing materials (with steel slag, mineral slag etc. as the main raw materials), waste aerated concrete, regeneration light sand and etc. were used as the main materials to prepare thermal insulation masonry mortar. Then the impacts of materials on the mortar’s performances such as strength, density and thermal conductivity were analyzed. At last, it obtained the optimal mixture ratio to prepare thermal insulation masonry mortar with a strength degree of M5. This kind of mortar used a lot of solid wastes as raw materials but with many advantages such as light weight, low thermal conductivity and low cost, all of this made it became a new environmental friendly thermal insulation masonry mortar.

Synthesis and Foaming Performance of Lauramidopropyl Betaine Derivate Surfactants

2019 ◽  
Vol 953 ◽  
pp. 147-152
Author(s):  
Bo Yang ◽  
Bo Yun ◽  
Xiao Lu ◽  
Qiao Na Liu ◽  
Zhi Fei Song ◽  
...  
Keyword(s):  
High Temperature ◽  
Surface Properties ◽  
Functional Group ◽  
Raw Materials ◽  
Salt Resistance ◽  
Temperature Resistance ◽  
Molar Ratios ◽  
High Temperature Resistance ◽  
Amphoteric Surfactants ◽  
Main Component

The ampholytic surfactant Lauramidopropyl betaine (LAB) is a multifunctional amphoteric surfactant, which is widely used in washing formulations and is the main component of many softeners and detergent formulations. It has the advantages of less irritation to skin, mild performance and easy biodegradability. It is superior to other amphoteric surfactants. In this paper, new surfactants were synthesized by using LAB as the main component and the molar ratios of LAB to formaldehyde were 1:1, 1:2, 1:3 and 1:4, respectively. The new functional group hydroxymethyl was introduced into the LAB, and the effect of hydroxymethyl on the properties of raw materials was discussed. And the surface properties were studied, including high temperature resistance, methanol resistance and salt resistance. The results showed that the high temperature resistance of R2 is better below 50 °C, R0 has better high temperature resistance above 50 °C; In the aspect of methanol resistance, the methanol resistance of R4 is better at 10% and 20% methanol content; The effect of R0 is better in salt resistance. Finally, it can be concluded that the introduction of methylol groups improves the performance of the prepared new surfactants in certain properties.

The thermoelectric properties of CoSb3 compound doped with Te and Sn synthesized at different pressure

2017 ◽  
Vol 31 (28) ◽  
pp. 1750261 ◽  
Author(s):  
Yiping Jiang ◽  
Xiaopeng Jia ◽  
Hongan Ma
Keyword(s):  
Thermal Conductivity ◽  
High Pressure ◽  
Electrical Resistivity ◽  
High Temperature ◽  
Seebeck Coefficient ◽  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
Raw Materials ◽  
Absolute Value ◽  
Dimensionless Figure Of Merit

The skutterudite CoSb[Formula: see text]Te[Formula: see text]Sn[Formula: see text] compound was synthesized successfully by high pressure and high temperature (HPHT) method using Co, Sb, Te and Sn powder as raw materials. The effects of pressure on its structure and the thermoelectric properties are investigated systematically from 300 K to 800 K. The electrical resistivity and the absolute value of the Seebeck coefficient for the sample increases with rising synthetic pressure. The thermal conductivity of the sample decreases with synthetic pressure and temperature rising in the range of 300–800 K. In this study, the maximum dimensionless figure of merit (ZT) value of 1.17 has been achieved at 793 K, 3 GPa for this thermoelectric material.

Reducing Thermal Conductivity of Polymer Derived SiC Ceramics via Microwave Sintering Processing

2012 ◽  
Vol 476-478 ◽  
pp. 932-935 ◽  
Author(s):  
Xiao Yi Han ◽  
Xin Xing ◽  
Hai Feng Cheng ◽  
Jun Wang
Keyword(s):  
Thermal Conductivity ◽  
Raw Materials ◽  
Microwave Sintering ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Dwelling Time ◽  
Low Thermal Conductivity ◽  
Sic Ceramics ◽  
Thermal Analyzer ◽  
Thermal Diffusivities

Generally, high thermal conductivity of SiC ceramics is required. However, in some circumstances, low thermal conductivity SiC is also needed, for example, for good thermoelectricity or heat insulation. In this work, the product of pyrolysis of polycarbosilane (PCS) is chosen as raw materials. The microwave sintering process was applied to obtain low thermal conductivity at a relatively low sintering temperature. The microwave sintering processes were performed at 1200 °C under Ar atmosphere with dwelling time of 10, 20 and 30 min. The morphology and phases were analyzed by electric microscopy and X-ray diffraction (XRD), respectively. The thermal diffusivities, specific heat and thermal conductivities were measured by laser-flashed method using a thermal analyzer. The thermal conductivity of samples is within the range from 0.81 to 1.37 W/m•K. The sample with dwelling time of 30 min shows potential for multiple applications, due to its good crystallization in XRD spectra and relatively low thermal conductivity in the considered temperature range. The results also suggest a phase transformation at a dwelling time near 20 min that may have occurred.

Study on the High-Temperature Coating in Preventing Oxidation and Decarburization

2010 ◽  
Vol 154-155 ◽  
pp. 1830-1833
Author(s):  
Sheng Yao Lin ◽  
Lu Wen Tang ◽  
Jian Min Zeng
Keyword(s):  
Weight Gain ◽  
High Temperature ◽  
Raw Materials ◽  
Low Cost ◽  
Environment Friendly ◽  
Temperature Oxidation ◽  
Workpiece Surface ◽  
Processing Properties ◽  
The Impact ◽  
Oxidation Loss

In order to reduce the oxidation and decarburization caused by high temperature in the course of the heat treatment of metal materials, an environment-friendly coating consisting of glass powder and red mud as the main raw materials is applied. It is brushed on the workpiece surface, heated in the box-type resistance furnace.The high temperature oxidation weight gain and the depth of decarburization between naked steel and coating steel are studied using weight gain method and metallographic method. The impact of the coating to reduce oxidation loss and the main properties of coating are analyzed. The result shows that processing properties of the glass-based coating are excellent:it has no crack at high temperature, distributes uniformly on the workpiece surface and can be self-spalling after quenching. It effectively prevents the workpiece from oxidation and decarburization at 800-1100 . The coating is of low cost and easy to use.

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