scholarly journals Dendrite Segregation Changes in High Temperature Homogenization Process of As-cast H13 Steel

2019 ◽  
Vol 59 (10) ◽  
pp. 1893-1900 ◽  
Author(s):  
Yahui Han ◽  
Changsheng Li ◽  
Jinyi Ren ◽  
Chunlin Qiu ◽  
Yongqiang Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
H13 Steel ◽  
Homogenization Process ◽  
Temperature Homogenization

Analysis of Influence of High Temperature Homogenizing on UV Transmittance of Quartz Glass

2016 ◽  
Vol 680 ◽  
pp. 285-288 ◽  
Author(s):  
Zhu Feng Shao ◽  
Ya Nan Jia ◽  
Chuan Dong Rao ◽  
Zai Kui Xiang ◽  
Mei Sui ◽  
...  
Keyword(s):  
High Temperature ◽  
Quartz Glass ◽  
Near Infrared ◽  
Homogenization Temperature ◽  
Optical Elements ◽  
Factors Affecting ◽  
Synthetic Quartz ◽  
Homogenization Process ◽  
Temperature Homogenization ◽  
Uv Transmittance

Synthetic quartz glass is an excellent transmittance material in ultraviolet (UV), visible and near-infrared bands. Homogenization process to synthetic quartz glass optical elements is done in order to make the composition and structure more uniform. The homogenization temperature is above 1800°C. After high-temperature homogenization, the UV transmittance of quartz glass appears a certain extent of decline in the edge partition., After high temperature homogenization process, it is found that the closer the layer to the graphite vessel, the stronger influence on UV transmittance will be. This conclusion is made by comparing the UV transmission of the quartz glass in different layers. Furthermore, the factors affecting the UV transmittance is also analyzed in this article.

V-alloyed ZrO2 coatings with temperature homogenization function for high-temperature sliding contacts

2013 ◽  
Vol 228 ◽  
pp. 76-83 ◽  
Author(s):  
O. Jantschner ◽  
C. Walter ◽  
C. Muratore ◽  
A.A. Voevodin ◽  
C. Mitterer
Keyword(s):  
High Temperature ◽  
Sliding Contacts ◽  
Temperature Homogenization

Properties of Electrospark Deposited Cr Coatings on AISI H13 Steel

2012 ◽  
Vol 472-475 ◽  
pp. 288-292
Author(s):  
Cean Guo ◽  
Jian Zhang ◽  
Li Yang ◽  
Wei Zhou ◽  
Hong Hui Sun
Keyword(s):  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Wear Behavior ◽  
H13 Steel ◽  
Electrospark Deposition ◽  
Temperature Oxidation ◽  
Aisi H13 Steel ◽  
Aisi H13 ◽  
Steel Substrates

Cr coatings were deposited on AISI H13 steel substrates by means of electrospark deposition (ESD). The coatings were characterized in terms of their microstructure, hardness, friction and wear behavior and high-temperature oxidation resistance. Micro-indentation and tribometer testers were employed to measure the mechanical properties of Cr coatings and AISI H13 steel. The results showed that the hardness of the coatings ranged from 600 to 660 HV, with a higher value than that of AISI H13 steel (510 HV). The coefficient of steady-state friction of the coatings against 45-carbon-steel balls ranged from 0.23 to 0.27, with a lower value than that of AISI H13 steel (0.62-0.68). The isothermal oxidation behavior of the coatings at 850°Cwas studied in comparison with AISI H13 steel substrates. The results indicated that Cr coatings substantially increase the high-temperature oxidation resistance of AISI H13 steel and the oxidation process was retarded mainly by the presence of a Cr2O3 oxide scale on the coatings at 850°C for 100 hours.

Obtaining of Graphene Structure Containing Ceramic Composites in High Temperature Vacuum Furnace

2017 ◽  
Vol 900 ◽  
pp. 101-104
Author(s):  
Natia Jalagonia ◽  
Fernand Marqui ◽  
Karlo Barbakadze ◽  
Ekaterine Sanaia ◽  
Guram Bokuchava ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
High Temperature ◽  
Ceramic Materials ◽  
Ceramic Composites ◽  
Organic Binder ◽  
Vacuum Furnace ◽  
Natural Graphite ◽  
Equal Distribution ◽  
Oxide Layers ◽  
Homogenization Process

We have obtained ceramic composites containing graphene structure, where homogenization process of powdery composite was improved. At first, α-alumina was obtained from local row, which is cheap and available. The obtaining method was developed by our group. Graphene oxide was synthesized from natural graphite. Homogenization was carried out in nanomill with organic binder, which provides for equal distribution and separation of graphene oxide layers (Organic binder behaves as “scotch tape”) during grinding. Some characteristics of ceramic materials have been improved.

High-temperature homogenization behaviour of some sodic mieroperthites

1975 ◽  
Vol 40 (309) ◽  
pp. 59-64 ◽  
Author(s):  
Ian Parsons
Keyword(s):  
High Temperature ◽  
X Ray ◽  
Critical Composition ◽  
History Of ◽  
Temperature Homogenization

SummaryWhile undergoing 'dry' homogenization at 980°C the 2̄01 X-ray reflections of sodic lowalbite- microcline microperthites show that phase compositions recapitulate (but in a reverse timesense) the unmixing history of ordered feldspars about a solvus with a critical composition near 26 mole per cent KAlSi3O8.

Application of PVD Coatings for Improvement of Die Performance in Copper Semi-Solid Processing

2006 ◽  
Vol 116-117 ◽  
pp. 84-87 ◽  
Author(s):  
Sang Yong Lee ◽  
Sang Yul Lee
Keyword(s):  
High Temperature ◽  
Protective Coatings ◽  
Multilayer Coating ◽  
Multilayer Coatings ◽  
H13 Steel ◽  
Crn Coating ◽  
Aisi H13 ◽  
Improved Performance ◽  
Semi Solid ◽  
Superlattice Period

TiAlN/CrN multilayer coatings with an superlattice period of 6.1nm was applied to a proto-type high temperature segment mold for Cu semi-solid processing so that it was investigated the possibilities of TiAlN/CrN multilayer coating as a candidate protective coatings to extend the lifetime of high temperature molds and dies. Much improved performance was obtained from the TiAlN/CrN coated molds, although different behaviors were observed depending upon the type of substrate mold materials. . Improvement of mold performance was observed by TiAlN/CrN coating on AISI H13 steel, but TZM alloy with TiAlN/CrN coating was found to be the best candidate as a mold for high temperature Cu semi-solid processing.

Preparation of Bauxite-Based Homogenized Mullite Grogs with Bauxite and Coal Gangue

2011 ◽  
Vol 199-200 ◽  
pp. 1940-1944 ◽  
Author(s):  
Zhong Zheng Yang ◽  
Zhen Xian Xing ◽  
Zhan Fang Gai ◽  
Huan Qiang Liu
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Bulk Density ◽  
Sintering Temperature ◽  
Apparent Porosity ◽  
Heat Processing ◽  
Sintering Behavior ◽  
Sintering Aids ◽  
Homogenization Process ◽  
Three Stages

The sintering behavior, physical properties and heat processing changes of bauxite-based homogenized grogs prepared by homogenization process and high temperature sintering using bauxite as starting material were investigated. Results show that the bauxite-based mullite can be synthesized by the method, sintering temperature with and without MgO/CeO2sintering aids are 1600°C and 1700°C separately, the mullite with apparent porosity of＜1.0% and 2.5%, bulk density of ≥2.87g•cm-3and 2.75g•cm-3, Refracteriness-Under-Load(RUL) 1600°C and 1620С; changes in the heat processing is divided into three stages: dehydration stage(400°С~900°С ), primary mullitization stage(1000°С ~1200°С) and secondary mullitization stage(>1200°С).

High temperature wear performance of laser cladding maraging steel with low nickel on AISI H13 steel

2021 ◽  
pp. 095440622110127
Author(s):  
Wei Jiang ◽  
Shuqi Wang ◽  
Lan Wang
Keyword(s):  
Thermal Stability ◽  
Wear Resistance ◽  
High Temperature ◽  
Maraging Steel ◽  
Laser Cladding ◽  
H13 Steel ◽  
Wear Performance ◽  
High Temperature Wear ◽  
Steel Coating ◽  
Thermal Stability Of

H13 steel is prone to insufficient high temperature wear resistance due to thermal wear under high temperature conditions. To improve high temperature wear resistance of H13 steel, the maraging steel coating with low-nickel was successfully prepared owing to excellent thermal stability. Sliding wear tests at 400, 500 and 600 °C were carried out for the laser cladding coating and H13 steel to comparatively investigate their high temperature wear performance and mechanism. The microstructure, phases, hardness and thermal stability of the maraging steel coating were also studied. The results showed that the maraging steel coating possessed excellent high temperature wear resistance and effectively improved the high temperature wear resistance of H13 steel by laser cladding. The superior thermal stability of maraging steel played an important role in improving its high temperature wear resistance.

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