Results 301 to 310 of about 569,951 (336)

Microstructural characterization of fresh cement paste via random packing of ellipsoidal cement particles

Materials Characterization, 2012
Abstract At the microscopic scale, fresh cement paste is composed of random packing of irregular cement particles and their packing behavior plays an important role in microstructural evolution. The preponderance of previous work has focused on the microstructural model by random packing of spherical or two-dimensional (2D) elliptical particles, and ...
W.X. Xu, H.S. Chen
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Packing Density Improvement for Improving Strength of Cement Paste

Materials Science Forum, 2019
To design a mix for high-strength concrete is not easy, one of the methods is to improve the packing density of the cementitious materials. To study the effect of packing density on strength, a comprehensive research program using superfine pulverized fuel ash and silica fume was carried out. Results showed that a high superfine pulverized fuel ash and
Jian Jian Chen, Hong Niao Chen, Gu Li
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Producing Surface Coatings on Silicon Nitride by Pack Cementation

2008
Pack cementation processing was used to chemically alter the surface of dense silicon nitride materials and form a coating layer. Test samples were examined by XRD, SEM, and optical microscopy to characterize the chemicaland microstructural changes in the materials after processing.
S. D. Nunn, R. A. Lowden, F. C. Montgomery   +2 more
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Processing of Optimized Cements and Concretes Via Particle Packing

MRS Bulletin, 1993
It has been well-recognized for many years that the particle-size distributions of the cement and the grading of the aggregates play an important role in determining the properties and characteristics of cement and concrete products. DSP (densified with small particles) type cements and concretes, to a certain extent, MDF (macro-defect-free) cements ...
D.M. Roy, B.E. Scheetz, M.R. Silsbee
openaire   +1 more source

Preparation of titanizing coating on AISI 316 stainless steel by pack cementation to mitigate surface damage: Estimations of corrosion resistance and tribological behavior

Journal of Physics and Chemistry of Solids, 2019
In this study, a titanizing coating was prepared on AISI 316 stainless steel (316 SS) using the pack cementation technique at 1173 K for 6 h. The microstructural characteristics and surface hardness of the titanizing coating were systematically analyzed.
N. Lin, Lulu Zhao, Qiang Liu, J. Zou, Ruizhen Xie, Shuo Yuan, Dali Li, Luxia Zhang, Zhihua Wang, B. Tang   +9 more
semanticscholar   +1 more source

Pack Cementation Coating of Steel for High-Temperature Applications

CORROSION 1988, 1988
Abstract The equilibrium partial pressures of gaseous species in halide- activated cementation coating packs are calculated. These results provide insight to the coating mechanism for different packs. Under special conditions, two elements can be codeposited into iron or stainless steels to form protective coatings with excellent ...
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Particle packing and rheology of cement pastes at different replacement levels of cement by α-Al2O3 submicron particles

Construction and Building Materials, 2017
Abstract The aim of this study was to clarify the micro-scale processes which control the fresh and hardened properties of hydrating cement pastes containing up to 10 wt% of α-Al 2 O 3 submicron particles and a polycarboxylate-type superplasticizer. The main factor controlling the changes in the microstructure and properties of the fresh pastes with
Štefančič, Mateja, Mladenovič, Ana, Bellotto, Maurizio, Jereb, Vesna, Završnik, Lina   +4 more
openaire   +2 more sources

Microstructure and properties of Cr-AlN composite coating prepared by pack-cementation on the surface of Al-containing ODS steel

Surface & Coatings Technology, 2022
Xiangshu Hou, Hao Wang, Qun Yang, Yanxia Chen, L. Chai, Bo Song, N. Guo, Shengfeng Guo, Z. Yao   +8 more
semanticscholar   +1 more source

High temperature oxidation and ablation behaviors of HfB2-SiC/SiC coatings for carbon/carbon composites fabricated by dipping-carbonization assisted pack cementation

Journal of Materials Science & Technology, 2021
Lei Zhou, Jiaping Zhang, Dou Hu, Qiangang Fu, Wu Ding, Jiaqi Hou, Bing Liu, Mingde Tong   +7 more
semanticscholar   +1 more source

Improved hot corrosion resistance of TiBw/TA15 composite via pack cementation aluminide coating

Corrosion Science, 2022
Qing-liang Kang, Xiaoting Xu, Guofeng Wang, Yuqing Chen, S. Luo   +4 more
semanticscholar   +1 more source