Nature Inspired Dough Processing of Alumina-Zirconia Composites: Rheology, Plasticity and Weibull analysis towards Net Shaping

A comparative study between alumina added niobia ceramics and two alumina zirconia composites from nanostructured TZP (7% and 14% weight) was made. On this composites the zirconia were yttria stabilized and the alumina were submicron structured. As sintering aid a mixture of magnesia, niobia and talc were used on all samples. The sintering was performed at 1450 oC during 60 minutes. The characteristic grain size and shape of an alumina and zirconia powders, aggregates and agglomerates were characterized. The sintering ceramics were evaluated through hardness, fracture toughness and 4 point bending test. Weibull statistic was applied on the flexural results. Although the fracture toughness result from ZTA were lower, and seems to be affected by the liquid fase, the hardness and Weibull modulus were higher than alumina niobia. The grains size and the homogeneity of its distributions on the microstructure of this ceramics was correlated to these higher values. The results from these alumina zirconia composites showed a potential to apply as a ballistic armor material.

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Investigation of the powder characteristics and microstructures of alumina-zirconia composites

Materials Science and Engineering A ◽

10.1016/0921-5093(94)09672-4 ◽

1995 ◽

Vol 194 (2) ◽

pp. 235-241 ◽

Cited By ~ 3

Author(s):

S. Novak ◽

T. Kosmač ◽

V. Ribitsch

Keyword(s):

Zirconia Composites ◽

Powder Characteristics

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Mechanical Properties of Feed Pellets: Weibull Analysis

Biosystems Engineering ◽

10.1016/s1537-5110(02)00264-7 ◽

2003 ◽

Vol 84 (3) ◽

pp. 349-361 ◽

Cited By ~ 27

Author(s):

K.A. Aarseth ◽

E. Prestløkken

Keyword(s):

Mechanical Properties ◽

Weibull Analysis ◽

Feed Pellets

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Fabrication of carbide-particle-reinforced titanium aluminide-matrix composites by laser-engineered net shaping

Metallurgical and Materials Transactions A ◽

10.1007/s11661-004-0039-2 ◽

2004 ◽

Vol 35 (3) ◽

pp. 1133-1140 ◽

Cited By ~ 6

Author(s):

Weiping Liu ◽

J. N. DuPont

Keyword(s):

Titanium Aluminide ◽

Carbide Particle ◽

Matrix Composites ◽

Laser Engineered Net Shaping ◽

Net Shaping

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Process Modeling in Laser Deposition of Multilayer SS410 Steel

Journal of Manufacturing Science and Engineering ◽

10.1115/1.2738962 ◽

2007 ◽

Vol 129 (6) ◽

pp. 1028-1034 ◽

Cited By ~ 55

Author(s):

Liang Wang ◽

Sergio Felicelli

Keyword(s):

Phase Transformation ◽

Temperature Distribution ◽

Three Dimensional ◽

Element Model ◽

Traverse Speed ◽

Processing Parameters ◽

Dimensional Finite Element ◽

Net Shaping ◽

Three Dimensional Finite Element ◽

Continuous Cooling Transformation Diagram

A three-dimensional finite element model was developed to predict the temperature distribution and phase transformation in deposited stainless steel 410 (SS410) during the Laser Engineered Net Shaping (LENS™) rapid fabrication process. The development of the model was carried out using the SYSWELD software package. The model calculates the evolution of temperature in the part during the fabrication of a SS410 plate. The metallurgical transformations are taken into account using the temperature-dependent material properties and the continuous cooling transformation diagram. The ferritic and martensitic transformation as well as austenitization and tempering of martensite are considered. The influence of processing parameters such as laser power and traverse speed on the phase transformation and the consequent hardness are analyzed. The potential presence of porosity due to lack of fusion is also discussed. The results show that the temperature distribution, the microstructure, and hardness in the final part depend significantly on the processing parameters.

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