Effect of Boronizing Treatment on the Conductivity of a High-Conductivity and Heat-Resisting Al-Zr Alloy Conductor Material

2021 ◽  
Vol 1035 ◽  
pp. 83-88
Author(s):  
Zhi Kai Zheng ◽  
Xiang Xiao ◽  
Hao Wu ◽  
Hong Ying Li ◽  
Pi Zhi Zhao
Keyword(s):  
Heat Resistance ◽  
Mass Fraction ◽  
Transition Element ◽  
High Conductivity ◽  
Transition Elements ◽  
Heat Resistant ◽  
Good Heat Resistance ◽  
Good Heat ◽  
State Form ◽  
Zr Alloy

The effect of boronizing treatment on the conductivity of a high-conductivity and heat-resistant Al-Zr alloy conductor material was studied. The results showed that the conductivity of industrial pure Al containing transition element (Ti, V, Cr, Mn)>0.01 wt % (mass fraction, the same below) was improved to a certain extent by using boronizing treatment to remove transition metal elements through the formation of borides. Using the boronizing treatment, B can react with transition elements to form blocky (Ti, V, Fe)B2 and flocculent (Ti, V, Fe, Zr)B2. The boronizing treatment makes Ti and V out of the solid solution state, form borides and finally deposit to the bottom of the furnace, thus significantly improving the conductivity of the ingot. In addition, Cr and Mn were not found in the borides at the bottom of the furnace. However, for the high-conductivity and heat-resisting Al-Zr alloy conductor material, B will have poison effects on Zr during boronizing treatment, thus reducing the heat-resistance of the alloy. Therefore, in the preparation process of high-conductivity and heat-resistant Al-Zr alloy conductor material, the converter process should be added after boronizing treatment to ensure that the Al-Zr alloy conductor material has good heat-resistance and conductivity at the same time.

Study of Heat-Resistant Cotton Stalk Bast Fibers Reinforced Polylactic Acid Composites

2012 ◽  
Vol 583 ◽  
pp. 53-56 ◽  
Author(s):  
Zheng Wu ◽  
Chun Yan Wei ◽  
Yong Zhu Cui ◽  
Li Hua Lv ◽  
Wang Xiao
Keyword(s):  
Heat Resistance ◽  
Mass Fraction ◽  
Orthogonal Experiment ◽  
Processing Condition ◽  
Cotton Stalk ◽  
Molding Temperature ◽  
Bast Fibers ◽  
Optimal Processing ◽  
Good Heat Resistance ◽  
Good Heat

The heat-resistance of PLA is so poor that its application area was limited. It can be widely applied after improvement. In the process of making cotton stalk bast fibers reinforced PLA composites, adding TAIC a type of cross-linking agent in the experiment produces a kind of composites with good heat-resistance. Orthogonal experiment table including length and mass fraction of fibers, molding temperature and addition of TAIC was devised. Then the study focused on the heat-resistance of the composites and the analysis of range and variance were done. The optimal processing condition was obtained: length of fibers was 10mm, mass fraction of fibers was 30%, molding temperature was 175°C and addition of TAIC was 1%. In addition, fibers reinforced PLA composites without TAIC had better heat-resistance than the pure PLA material, the HDT raised 54°C, and the composites added TAIC obtained the best heat-resistance of all. This composite can be extensively used in many fields.

scholarly journals Silicone Resin-Based Intumescent Paints

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4785
Author(s):  
Maria Zielecka ◽  
Anna Rabajczyk ◽  
Krzysztof Cygańczuk ◽  
Łukasz Pastuszka ◽  
Leszek Jurecki
Keyword(s):  
Heat Resistance ◽  
Expanded Graphite ◽  
Steel Structures ◽  
Silicone Resin ◽  
Hydroxyl Groups ◽  
The Novel ◽  
Coating Materials ◽  
Good Heat Resistance ◽  
Good Heat

Silicone resins are widely applied as coating materials due to their unique properties, especially those related to very good heat resistance. The most important effect on the long-term heat resistance of the coating is connected with the type of resin. Moreover, this structure is stabilized by a chemical reaction between the hydroxyl groups from the organoclay and the silicone resin. The novel trends in application of silicone resins in intumescent paints used mostly for protection of steel structures against fire will be presented based on literature review. Some examples of innovative applications for fire protection of other materials will be also presented. The effect of silicone resin structure and the type of filler used in these paints on the properties of the char formed during the thermal decomposition of the intumescent paint will be discussed in detail. The most frequently used additives are expanded graphite and organoclay. It has been demonstrated that silicate platelets are intercalated in the silicone matrix, significantly increasing its mechanical strength and resulting in high protection against fire.

Synthesis of Tung Oil-Based Bi-Dihydrogen-Maleimide

2012 ◽  
Vol 554-556 ◽  
pp. 787-791
Author(s):  
Jin Hua Zhou ◽  
Xun Jun Du ◽  
Han Zhou Sun ◽  
Yu Xiong Wu ◽  
Xiao Feng Tan ◽  
...  
Keyword(s):  
Heat Resistance ◽  
Polymeric Materials ◽  
Decomposition Temperature ◽  
Target Product ◽  
Optimal Conditions ◽  
Initial Decomposition Temperature ◽  
Tung Oil ◽  
Renewable Biomass ◽  
Good Heat Resistance ◽  
Good Heat

Started from Tung oil, a renewable biomass material of china, a new kind of bismaleimide, Tung oil-based bi-dihydrogen-maleimide (TOBBDHMI) was synthesized by the reaction of methyl-α-eleostearate-maleic anhydride adduct (MEMAA) and 4,4'-diphenylmethane disocyanate (MDI). The optimal conditions for synthesis were catalyst triethylamine dosage 1.0%, mole ratio of MEMAA to MDI 2.4:1, reaction temperature 75°C and reaction time 2 h, which gave yield 82.4% for TOBBDHMI (calculated from MDI). The melting point of the product was 186.6 °C~189.3 °C, initial decomposition temperature was 270 °C and final decomposition temperature was 510 °C, which showed the product has good heat resistance. The target product is potential to be used alone or with other bismaleimide monomers to improve polymeric materials’ heat resistance and/or mechanical properties.

Filler Effect on the Heat Stability of Vulcanized Elastomeric Compositions

1973 ◽  
Vol 46 (4) ◽  
pp. 927-937 ◽  
Author(s):  
M. Q. Fetterman
Keyword(s):  
Elevated Temperature ◽  
Carbon Black ◽  
Heat Resistance ◽  
Elevated Temperatures ◽  
Heat Stability ◽  
Rubber Compound ◽  
Hydrated Silica ◽  
Serviceable Life ◽  
Good Heat Resistance ◽  
Good Heat

Abstract The purpose of this study was to determine filler effects on heat stability of vulcanized elastomeric compositions. Carbon-black reinforced compounds, designed to have good heat resistance, were modified by substituting hydrated silica for all or part of the black. Since a simple replacement of silica for black would result in dissimilar original properties, the substituted compounds were further revised to minimize this dissimilarity. This was accomplished through curative correction and/or addition of an organosilane coupling agent. Silica substitution did not provide permanency of properties at elevated temperatures, but in all cases the serviceable life of the compound was extended. Since silica substitution had minimum effect on other properties and reduced the rate of degradation at elevated temperature, this may be considered a reasonable alternative to completely redesigning a proven rubber compound in order to improve its heat resistance.

Synthesis and Heat Resistance of Arylenedioxy-organosilanylene Polymers with Adamantane Units

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1567-1570
Author(s):  
Takayuki Maehara ◽  
Hiroshi Hashimoto ◽  
Joji Ohshita
Keyword(s):  
Weight Loss ◽  
Thermogravimetric Analysis ◽  
Heat Resistance ◽  
Good Heat Resistance ◽  
Good Heat

Arylenedioxy-organosilanylene polymers with adamantane units in the backbone were prepared by Rh-catalyzed dehydrocoupling of bis(4-hydroxyphenyl)adamantanes with organohydrosilanes, and their heat resistance was evaluated by thermogravimetric analysis in nitrogen. Among these polymers, the highest Td10 (10% weight loss temperature) of 547 °C was achieved for polymer 2a prepared from 1,3-bis(4-hydroxyphenyl)adamantane and phenylsilane. Polymer 2a exhibited good heat resistance even in air with Td10 = 387 °C, and standing of the polymer at 150 °C for 8 h resulted in no evident weight loss

Heat-resistant antiflaming and friction mechanisms in nano-Fe2O3-reinforced silicon rubber

2013 ◽  
Vol 20 (4) ◽  
pp. 331-335 ◽  
Author(s):  
Bin Zhao ◽  
Qilei Wang ◽  
Lin Jin
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
High Temperature ◽  
Heat Resistance ◽  
Friction Mechanisms ◽  
Raw Materials ◽  
Physical And Mechanical Properties ◽  
Maximum Elongation ◽  
Heat Resistant ◽  
Good Heat

AbstractA ferric oxide (Fe2O3)/silicone rubber (SR) composite was prepared to produce a magnetic rubber with good heat-resistant and friction properties: SR and nano-Fe2O3 were used as its raw materials. The heat-resistant, antiflaming, magnetic, and mechanical properties of such composites with different proportions of nano-Fe2O3 were studied. The results showed that the Fe2O3 nanoparticles were uniformly distributed throughout the composites. The physical and mechanical properties of SR were improved when Fe2O3 nanoparticles were added. The maximum elongation and tensile strength of the composites were relatively good when the ratio of Fe2O3 was 20 phr. The heat-resistance and antiflaming properties of SR were improved by adding nano-Fe2O3, which had good combined heat resistance. The friction properties of these composites were optimal at 20 phr addition of nano-Fe2O3, which laid the foundation for further applications of this type of composite in high-temperature sealing and shock absorption environments.

scholarly journals ANALISIS PROSES PENGECORAN DAN PERMESINAN BUSHING RODA KERETA DI GALANGAN KAPAL

2016 ◽  
Vol 1 (2) ◽  
pp. 47-60
Author(s):  
Nanda Dwiguna ◽  
Akhmad Syarief
Keyword(s):  
Heat Resistance ◽  
Casting Process ◽  
Machining Process ◽  
Sand Mold ◽  
Well Water ◽  
Average Value ◽  
Good Heat Resistance ◽  
Outside Diameter ◽  
Good Heat ◽  
Test Result

This study aims to know  the process of making brass bushing to succeed into a product along with the value of violence and roughness. Methods used include evaporative method, CO2 sand mold and method x. This research is done by first preparing tools and materials then done casting process where brass used in melted then cast into casting castings and in chill with well water. Furthermore, the machining process using a lathe with carbide chisel and engine rotation used for 590 RPM. From roughness test result after machining process got value at outside diameter of point A 2,532 μm, point B equal to 2,544 μm, point C equal to 2,673 μm, then diameter in point A equal to 1,539 μm, point B equal to 1,749 μm. For the value of hardness on the method of sand mold CO2 obtained an average value of 42 HRB, evaporative methods of 33.2 HRB and method x obtained an average value of 39.8 HRB. Fromithese results it is known that the hardness of the best bushing in this research is by the method of sand mold CO2 because it has good heat resistance and good mold density.

HRTEM Observation of Age-Precipitation in Mg-2.9at.% Alloys

2014 ◽  
Vol 922 ◽  
pp. 503-506
Author(s):  
Yuki Matsuoka ◽  
Katsumi Watanabe ◽  
Seiji Saikawa ◽  
Susumu Ikeno ◽  
Kenji Matsuda
Keyword(s):  
Rare Earth ◽  
Magnesium Alloy ◽  
Heat Resistance ◽  
Rare Earth Element ◽  
Diffuse Scattering ◽  
Earth Element ◽  
Age Hardening ◽  
Hrtem Observation ◽  
Good Heat Resistance ◽  
Good Heat

The magnesium alloy containing rare earth element is known to show good heat resistance. In this study, Mg-Y, Mg-Gd and Mg-Gd-Y alloys including the same total amount of solute elements have been investigated to clarified the effect of the Y atom on age-hardening and precipitation using HRTEM, SAED technique and HRTEM simulation. The diffuse scattering by SAED was obtained in as-quenched condition in all alloys. In the specimen at as-quenched condition, the row contrasts consisted of bright and dark dots lying on the {100}Mgplanes, which were considered to mono-layer were observed by HRTEM.

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