scholarly journals Correction to: Statistical Analysis of the Flexural Strength of Free-Standing Flame-Sprayed Alumina Coatings Prior and After Thermal Shock

2021 ◽  
Author(s):  
Marc Neumann ◽  
Patrick Gehre ◽  
Jana Hubálková ◽  
Henry Zielke ◽  
Martin Abendroth ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Flexural Strength ◽  
Thermal Shock ◽  
Free Standing ◽  
Alumina Coatings

scholarly journals Statistical Analysis of the Flexural Strength of Free-Standing Flame-Sprayed Alumina Coatings Prior and After Thermal Shock

2020 ◽  
Vol 29 (8) ◽  
pp. 2026-2032
Author(s):  
Marc Neumann ◽  
Patrick Gehre ◽  
Jana Hubálková ◽  
Henry Zielke ◽  
Martin Abendroth ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Flexural Strength ◽  
Thermal Shock ◽  
Free Standing ◽  
Alumina Coatings

Application of Statistical Analysis in the Powder Injection Molding (PIM) of Mullite

2015 ◽  
Vol 659 ◽  
pp. 53-57
Author(s):  
Parinya Chakartnarodom ◽  
Nuntaporn Kongkajun ◽  
Nutthita Chuankrerkkul
Keyword(s):  
Statistical Analysis ◽  
Flexural Strength ◽  
Injection Molding ◽  
Hypothesis Test ◽  
Least Square Method ◽  
Powder Injection Molding ◽  
Least Square ◽  
Statistical Hypothesis ◽  
Powder Injection ◽  
Mullite Powder

In this work, the statistical analysis methods, including least square method and statistical hypothesis testing, were used to study the flexural strength and density of the specimens formed from mullite powder by powder injection molding (PIM). The feedstock for PIM consist of mullite powder and the composite binder consisting of 78 wt% polyethylene glycol (PEG), 20 wt% polyvinyl butyral (PVB), and 2 wt% stearic acid (SA). The PIM machine used in this work was the lab-scale plunger type. The compositions of the feedstock that could be injection molded by this machine were 50, 52, and 54vol% mullite. After molding, PEG in the green specimens was removed prior to sintering by soaking the specimens in the water at 60 °C for 24 hours while PVB and SA were removed during sintering. The sintering temperatures were 1300 to 1450°C. At significance level of 0.05, the least square method and the statistical hypothesis test showed that both feedstock compositions and sintering temperatures used in this work affected the densities of sintered specimens. However, the increasing of the flexural strength of sintered specimens was mainly by the increasing of the sintering temperature.

Effect of AlF3 Content on Microstructure and Properties of Mullite/Al2O3 Composite Ceramics

2018 ◽  
Vol 922 ◽  
pp. 62-67
Author(s):  
Ke Zheng Sang ◽  
Fan Wang ◽  
De Jun Zeng ◽  
Hong Wei Li
Keyword(s):  
Fracture Toughness ◽  
Flexural Strength ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Diameter Ratio ◽  
Pressureless Sintering ◽  
Composite Ceramics ◽  
Microstructure And Properties ◽  
Shock Resistance ◽  
Mullite Whiskers

To reinforce the mullite/Al2O3 composite ceramics through formation of mullite whiskers, the composite ceramics were prepared by pressureless sintering using different AlF3 content. The microstructure, porosity, fracture toughness and thermal shock resistance of the composite ceramics were investigated. The results show that the addition of AlF3 can promote the mullite whisker formations, and the whiskers with the size of 3～10μm in diameter and a length-diameter ratio of 10～15 are obtained by sintering at 1600°C with the AlF3 content of 5wt%. Fracture toughness and thermal shock resistance of the composite ceramics are improved by the formation of mullite whisker. The fracture toughness of 4.79MPa•m1/2 can be obtained, and the 95.18% flexural strength remained after thermal shock.

Optimization by mixture design approach

2020 ◽  
Vol 18 (6) ◽  
pp. 1731-1747
Author(s):  
Yacine Abadou ◽  
Abderrahmane Ghrieb ◽  
Rosa Bustamante ◽  
Hayette Faid
Keyword(s):  
Experimental Data ◽  
Statistical Analysis ◽  
Flexural Strength ◽  
Mixture Design ◽  
Mixture Component ◽  
Lime Mortar ◽  
Content Type ◽  
Input Combination ◽  
High Degree ◽  
Marble Waste

Purpose The purpose of this study is to fit an appropriate mathematical model to express response variables as functions of the proportions of the mixture components. One purpose of statistical modeling in a mixture experiment is to model the blending surface such that predictions of the response for any mixture component, singly or in combination, can be made empirically. Testing of the model adequacy will also be an important part of the statistical procedure. Design/methodology/approach A series of mortar using air lime, marble and ceramic sanitary waste aggregates were prepared for statistically designed combinations. The combinations were designed based on the mixture-design concept of design of experiments; this mortar is often used as a filler material in restoration projects. The aim of this work is to find an optimal composition of a paste for the manufacture of air lime mortar with ceramic and marble waste. This investigation aims to recommend mix design for air lime-based mortar, by optimizing the input combination for different properties, and to predict properties such as mechanical strength, thermogravimetric and x-ray diffraction analysis with a high degree of accuracy, based on a statistical analysis of experimental data. Findings This paper discusses those mortar properties that architects, contractors and owners consider important. For each of these properties, the influence of ceramic and marble waste in the air lime mortar is explored. The flexibility of lime-based mortars with waste materials to meet a wide range of needs in both new construction and restoration of masonry projects is demonstrated. Originality/value The objective of the present investigation is to recommend mixture design for air lime mortar with waste, by optimizing the input combination for different properties, and to predict properties such as compressive strength, flexural strength with a high degree of accuracy, based on the statistical analysis of experimental data. The authors conducted a mixture design study that takes into account dependent parameters such as the constituents of our air lime-based mortar where we have determined an experiment matrix to which we have connected the two responses, namely, compressive and flexural strength. By introducing the desirability criteria of these two responses, using JMP software, we were able to obtain a mixture optimal for air lime mortar with ceramic and marble waste.

Effect of Gel Chemistry on the Machinability of Green SiC Parts Produced by Gelcasting

2012 ◽  
Vol 727-728 ◽  
pp. 1596-1603
Author(s):  
André Marques Riviello ◽  
Fernando dos Santos Ortega
Keyword(s):  
Surface Roughness ◽  
Silicon Carbide ◽  
Statistical Analysis ◽  
Flexural Strength ◽  
Cutting Force ◽  
Complex Geometry ◽  
Automotive Components ◽  
Green Machining ◽  
Gelcasting Process

The growing interesting in the use of silicon carbide in automotive components, biomaterials, energy, among others, which demand the production of parts with complex geometry that are difficult to obtain by conventional compaction techniques, motivates the search for developing new conformation processes. Within this context, this paper investigates the production of pieces of silicon carbide through the gelcasting process and subsequent green machining of these parts. Three systems of monomers were studied: MAM-NVP-MBAM, MAM-PEG (DMA) and MAM-HMAM. The effect of the concentration of monomers, concentration of chemical initiator and the ratio of chain-forming and crosslinker monomers on the cutting force during machining and surface roughness were evaluated. These data are compared with values of flexural strength and hardness of samples produced under the same conditions. Through a statistical analysis it was determined the best formulation for the production of parts of SiC with favorable characteristics of green machining.

CYCLIC THERMAL SHOCK PROPERTIES OF MOSI2 INTERMETALLIC MATERIALS

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2922-2927 ◽  
Author(s):  
SANG PILL LEE ◽  
JIN KYUNG LEE ◽  
CHAE HO LEEM
Keyword(s):  
Flexural Strength ◽  
Thermal Shock ◽  
Ultrasonic Wave ◽  
Attenuation Coefficient ◽  
Thermal Shock Test ◽  
Drastic Reduction ◽  
Nondestructive Technique ◽  
Shock Test ◽  
Damage Degree ◽  
Intermetallic Materials

This paper dealt with the thermal shock damages of MoSi 2 intermetallics by a nondestructive technique. The flexural strength of MoSi 2 intermetallics depending on the thermal shock cycles has been also investigated. The thermal shock test was repeatedly performed up to 80 cycles at the temperature difference of 423 K. The flexural strength of MoSi 2 intermetallics decreased with the increase of thermal shock cycle, due to the creation of crack and its propagation. MoSi 2 intermetallics represented the drastic reduction of ultrasonic wave velocity at the thermal shock of 40 cycles. The attenuation coefficient of MoSi 2 intermetallics increased with increasing the thermal shock cycle due to the activation of damage degree

Preparation and Performance of β-Sialon Bonded ZrO2 Composites

2011 ◽  
Vol 415-417 ◽  
pp. 138-141
Author(s):  
Rui Sheng Wang ◽  
Jun Hong Zhao ◽  
Ying Na Wei ◽  
Fu Hua Peng ◽  
Heng Yong Wei
Keyword(s):  
Thermal Expansion ◽  
Flexural Strength ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Reaction Sintering ◽  
Sintering Process ◽  
Carbon Addition ◽  
Shock Resistance ◽  
And Performance ◽  
Sialon Powder

β-Sialon bonded ZrO2 composites were prepared by reaction sintering process using β-Sialon and CaO stabilized ZrO2 powders as raw materials.The effect of β-Sialon powder additions on the properties of the composites was investigated. The results show that the samples with 10 wt% of β-Sialon addition had the lowest apparent porosity (29.80%) and the highest of flexural strength (68.70MPa). The thermal shock resistance in carbon addition of the composites could be improved by addtion of 5wt% β-Sialon. It may be relative with that the sample had the lowest thermal expansion coefficient in vacuum.

Mechanical Properties of Free-Standing Porous Anodic Alumina Films

2013 ◽  
Vol 200 ◽  
pp. 54-59
Author(s):  
Eugene Ignashev ◽  
Vladimir Shulgov
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Film Thickness ◽  
Pure Aluminum ◽  
Heat Removal ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Free Standing ◽  
Alumina Films ◽  
The One

The flexural strength and microhardness of free-standing anodic alumina films obtained from the one-sided anodization of aluminum are discussed. The films formed of high-pure aluminum were shown to have maximum flexural strength. Even a small amount of impurities decreases the flexural strength of the resulting free-standing anodic alumina films to be associated with their higher defectiveness. The microhardness of thick films of anodic alumina measured on the side of a barrier layer is independent of the film thickness, and this measured on the side of the porous layer decreases continuosly from 5.39-5.88 GPa to 2.94 GPa when the film thickness increases from 50 to 500 μm. The microhardness of thin (<100 μm) films of porous anodic alumina was studied as well. When the samples were immovable in the electrolyte during the anodization, the microhardness of the resulting films is low and varies from 0.93 to 1.86 GPa. When the samples moved in the electrolyte occasionally during the anodization, the microhardness of the resulting films increases to 1.67 – 2.45 GPa. When the samples moved in the electrolyte continuously during the anodization, the microhardness of the resulting films increases to 2.45 - 3.43 GPa. This is associated with the rate of the heat removal from the sample (the oxidation rate) during the anodization. The microhardness of the free-standing porous anodic alumina films formed of low binary alloys of aluminum is lower than one of films formed of high-pure aluminum.

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