Research on the Low Temperature Degradation Resistance of TiN/3Y-TZP

2009 ◽  
Vol 79-82 ◽  
pp. 287-290
Author(s):  
Jing Sun ◽  
Bao Kun Han ◽  
Xing Hua Yang ◽  
Chuan Zhen Huang
Keyword(s):  
Particle Size ◽  
Composite Materials ◽  
Low Temperature ◽  
Aging Temperature ◽  
Particle Sizes ◽  
Aging Rate ◽  
The Matrix ◽  
Key Factor ◽  
The Relationship ◽  
In Virtue Of

The composite materials TiN/3Y-TZP, 3Y-TZP doped by TiN with different contents and particle sizes, were fabricated through the same hot-pressing techniques. Compared with 3Y-TZP, the low temperature degradation resistance of TiN/3Y-TZP aged at the temperature from 170°C to 350°C in air for 50 h was investigated in virtue of XRD and SEM in the experiment. For TiN/3Y-TZP and 3Y-TZP, the maximum aging rate all occurs at 220°C. The addition of TiN can availably improve the low temperature degradation resistance of 3Y-TZP at different aging temperatures, but cannot change the relationship between the aging rate and the aging temperature. For TiN/3Y-TZP, the matrix particle size is the key factor responsible for its low temperature degradation resistance.

Production of quicklime from Ashaka limestone through calcination process

2021 ◽  
Vol 1 (2) ◽  
pp. 041-048
Author(s):  
Benson Chinweuba Udeh
Keyword(s):  
Particle Size ◽  
Critical Value ◽  
Operating Conditions ◽  
Quadratic Model ◽  
Particle Sizes ◽  
Calcination Process ◽  
Process Effects ◽  
Effects Of Temperature ◽  
The Difference ◽  
The Relationship

This study is on the production of quicklime from Ashaka limestone through calcination process. Effects of temperature, particle size and time on quicklime yield were determined. The experiment was carried out at temperatures of 800, 900, 1000, 1100 and 1200 0C, particle sizes of 80mm, 90mm, 100mm, 300mm and 425mm and times of 0.5hr, 1hr, 2hrs, 3hrs and 4hrs. Analyses of the results showed that quicklime was successfully produced from Ashaka limestone through the calcination process. Quadratic model adequately described the relationship between quicklime yield and calcination factors of temperature, particle size and time. Recorded model F-value of 134.35 implies that the model is significant. The predicted R² of 0.9597 is in reasonable agreement with the adjusted R² of 0.9844; the difference is less than the critical value of 0.2. Optimum yield of 73.48% was obtained at optima operating conditions; temperature of 1000 0C, particle size of 90 µm and time of 3 hrs.

scholarly journals Magnetomechanical Properties Of Composite Materials With Giant Magnetostriction

2015 ◽  
Vol 60 (3) ◽  
pp. 1819-1824 ◽  
Author(s):  
A.E. Tomiczek ◽  
R. Mech ◽  
L. A. Dobrzański ◽  
T. Tański
Keyword(s):  
Particle Size ◽  
Composite Materials ◽  
Magnetic Energy ◽  
Compressive Modulus ◽  
Powder Particle Size ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
The Matrix ◽  
Giant Magnetostriction ◽  
Polyurethane Matrix

AbstractThe aim of this work was to observe the changes in the magnetomechanical properties of composite materials with different Tb0.3Dy0.7Fe1.9(Terfenol-D) powder particle-size distributions and varying volume fractions in the polyurethane matrix. The results show a direct relationship between the properties and the particle size of the Tb0.3Dy0.7Fe1.9powder: the increases in the particle-size distribution of the Tb0.3Dy0.7Fe1.9powder in the matrix amplify the magnetostrictive responses and the compressive modulus values. Moreover, it was found that the key role in efficiency of the transformation of magnetic energy into mechanical plays the initial compressing pre-stress.

The Relationship Between Colliery-waste Particle Sizes and Plant Growth

1974 ◽  
Vol 1 (4) ◽  
pp. 281-284 ◽  
Author(s):  
Christopher G. Down
Keyword(s):  
Particle Size ◽  
Plant Growth ◽  
Water Retention ◽  
Size Range ◽  
Growth Period ◽  
Dry Weight ◽  
Particle Sizes ◽  
Small Particles ◽  
The Relationship ◽  
Water Holding

Seed germination and dry-weight production in Lolium perenne were examined in relation to growth on 12-years-old colliery waste separated into seven size-fractions. The size-range was from more than 4,000 μ to less than 125 μ, and the growth period was up to 30 days. Germination percentages after 6 days generally increased with decreasing particle-size, as did dry-weight. Shoot : root ratios also showed an inverse relationship with particle size.After 30 days there was no distinction between dryweights on different particle sizes, except that on the largest fractions it had been found impossible to keep the plants alive. Problems of water-holding capacity are discussed, and the significance of soil particle-size in revegetation work is examined, it being concluded that an admixture of small particles is important for water retention and plant growth.

scholarly journals Determination Of Power Loss In Fe-Based Soft Magnetic Composites

2015 ◽  
Vol 60 (2) ◽  
pp. 1411-1415 ◽  
Author(s):  
B. Jankowski ◽  
D. Kapelski ◽  
B. Ślusarek ◽  
J. Szczygłowski
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Composite Materials ◽  
Particle Size Distribution ◽  
Power Loss ◽  
Particle Sizes ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Soft Magnetic Composites

Abstract The magnetic properties of Fe-based composite materials with different particle sizes were investigated. The results of energy loss density were obtained from measurements of the static (DC) hysteresis cycles ranging from 0,2 to 1,4 T. In turn, the results of power loss density were obtained from measurements of the dynamic (AC) hysteresis cycles ranging from 20 to 400 Hz and at the maximum flux density 0,3; 0,9 and 1,3 T. Two sets of specimens was analyzed in the investigation: the specimens compacted under pressure of 800 MPa and hardened at 500°C and the specimens compacted under different pressure and hardened at 500°C. Specimens of the second set had the same density. The study confirmed the influence of particle size distribution on magnetic properties of Fe-based soft magnetic composites.

Spatial and Temporal Patterns in Macrobenthic Stream Diversity

1976 ◽  
Vol 33 (6) ◽  
pp. 1261-1270 ◽  
Author(s):  
Brigitte G. E. de March
Keyword(s):  
Particle Size ◽  
Related Species ◽  
High Variability ◽  
Particle Sizes ◽  
Spatial And Temporal Patterns ◽  
Mean Particle Size ◽  
Faunal Assemblages ◽  
Number Of Species ◽  
Stream Community ◽  
The Relationship

The relationship between the characteristics of a stream community and sediments were studied for 1 yr in a small unpolluted river with a morainal substrate. Recognizable faunal assemblages were associated with silt or silt fill, sand or sand fill, and large boulders. The fauna in sediments of mean particle sizes coarser than sand but finer than boulders was characterized by a high variability due largely to temporal successions of morphologically related species. It was found that the number of species was directly proportional to mean particle size (in [Formula: see text] units) in spring when the sediments were well sorted, but the relationship broke down as the sediment interstices filled in. In late fall when the sediments were badly sorted, the number of species is perhaps more related to the sorting coefficient of the sediments. The relevance of these findings to studies of pollution is discussed.

Lime Brust of Sintering Bricks of Purple Sandy Shale: the Effect of Limestone Particle Size

2011 ◽  
Vol 250-253 ◽  
pp. 46-49
Author(s):  
Zhi Gang Feng ◽  
Zhen Ping Tang ◽  
Hui Juan Li
Keyword(s):  
Particle Size ◽  
Hunan Province ◽  
Particle Sizes ◽  
Sintering Process ◽  
Critical Content ◽  
Production Practice ◽  
Sandy Shale ◽  
Free Cao ◽  
The Relationship

Simulating current sintering process in local brickkilns, Hengyang region, Hunan Province, China, at 800°C, througt indoor sintering experiment on a series of brick samples of purple sandy shale, in which particle sizes of limestone are >-1Φ, >0Φ, >1Φ, >2Φ, >3Φ and >4Φ, respectively, it is concluded that the following: (1) Limestone granularity is a crucial factor affecting the quality of sintering bricks of purple sandy shale. Under different particle sizes, the critical content of limestone causing lime brust of sintering bricks is distinct, and lowers with the increasing in limestone granularity. (2) When limestone granularity is different, its impact way on the quality of sintering bricks is also distinct. The more coarse limestone granularity is, the more concentrative the swelling stress produced by the hydration of free CaO is, the more easily lime brust occurs. On the contrary, the more fine limestone granularity is, the more dispersive the swelling stress is, there is the more help to reduce or eliminate the occurrence of lime brust. (3) In view of the relationship between limestone granularity and the critical content of limestone giving rise to lime brust of sintering bricks, the production practice can be effectively guided.

FURTHER OBSERVATIONS ON THE ABSORPTION OF VITAMIN A

PEDIATRICS ◽  
1950 ◽  
Vol 5 (3) ◽  
pp. 425-436
Author(s):  
J. M. LEWIS ◽  
SIDNEY Q. COHLAN ◽  
ANGELINA MESSINA
Keyword(s):  
Particle Size ◽  
Vitamin A ◽  
Particle Sizes ◽  
Small Particle Size ◽  
Fish Liver ◽  
Butter Fat ◽  
Fat Globule ◽  
Relationship Of ◽  
High Degree ◽  
The Relationship

Experiments carried out on infants revealed that vitamin A, as it occurs naturally in milk, was more effectively absorbed than when administered in an oily vehicle, but not quite as well absorbed as when given in an "aqueous" preparation. The high degree of absorbability of vitamin A in milk is due to the relatively small particle size of the butter fat globule. By reducing the particle size of a fish liver oil preparation (oleum percomorphum) to 1 to 2 µ by homogenization into milk or water, the absorption of vitamin A was considerably enhanced in children and in rats. The relationship of the particle size of the vehicle of vitamin A to absorption is further demonstrated by the results of the administration in children and in rats of three vitamin A preparations of varying particle size. Thus, the highest absorption occurred following the administration of a preparation containing particle size of submicroscopic proportion ("aqueous"); the lowest absorption resulted following the preparation containing particles macroscopic in size (oil) and intermediate absorption was observed following the use of a preparation containing particle sizes varying from 1 to 20 µ (emulsion). Similarly, in a child having cystic fibrosis of the pancreas, the absorption of vitamin A was dependent upon the particle size of the vehicle employed.

Application of X-Ray Fluorescence Analysis to Process Control

1961 ◽  
Vol 5 ◽  
pp. 486-499 ◽  
Author(s):  
F. Bernstein
Keyword(s):  
Particle Size ◽  
Process Control ◽  
Sampling Technique ◽  
Fluorescence Analysis ◽  
Particle Sizes ◽  
X Ray ◽  
Direct Sampling ◽  
Precision And Accuracy ◽  
Relationship Of ◽  
The Relationship

AbstractThe application of X-ray fluorescence-analysis methods to process control is discussed. Various methods of sample preparation are reviewed and compared. The use of the direct sampling technique is discussed and consideration is given to the effects of particle size on precision and accuracy of analytical results. The mechanism of these effects if presented, and some general principles concerning the relationship of fluorescent intensities and particle sizes of pure materials and mixtures are derived. Examples of particle-size effects in cement and mining applications are illustrated.

Effect of Grit Type, Aging Temperature, and Aging Time on Particle Size of Ground Natural Rubber/Zeolite Composite Powder

2016 ◽  
Vol 705 ◽  
pp. 24-29
Author(s):  
Karl C. Ondoy ◽  
Bryan B. Pajarito
Keyword(s):  
Particle Size ◽  
High Temperature ◽  
Low Temperature ◽  
Natural Rubber ◽  
Aging Time ◽  
Aging Temperature ◽  
Composite Powder ◽  
Chain Structure ◽  
Particle Size Range ◽  
Zeolite Composite

This study reports the results of investigation on the main and interaction effects of grit type, aging temperature, and aging time on particle size of ground natural rubber/zeolite (GNR/Z) composite powder using general factorial design of experiment. GNR/Z composite powder produced by mechanical grinding is porous, like an aggregated chain structure. These aggregates exist in clusters of irregular shape. Analysis of variance (ANOVA) shows that the effects of aging temperature and aging time depend on the particle size range. GNR/Z composite powder with large particle size is produced when aging is done at low temperature and short time due to high resistance of rubber to oxidation. On the other hand, GNR/Z composite powder with small particle size is produced when aging is done at low or high temperature and longer aging time. Low temperature condition offers high O2 concentration available to oxidize rubber while high temperature condition leads to more chain scissions due to higher oxidation rate.

Investigation of Relationship Between Sugar Yield and Particle Size in Biofuel Manufacturing

2017 ◽  
Author(s):  
Rajkamal Kesharwani ◽  
Xiaoxu Song ◽  
Yang Yang ◽  
Zeyi Sun ◽  
Meng Zhang ◽  
...  
Keyword(s):  
Particle Size ◽  
Design Of Experiments ◽  
Sugar Yield ◽  
Critical Parameters ◽  
Particle Sizes ◽  
Specific Process ◽  
Different Types ◽  
Optimal Configurations ◽  
The Relationship ◽  
Design Experiments

Biofuel manufacturing consists of two major processes, i.e., feedstock preprocessing and bioconversion. The preprocessing includes size reduction and pelleting. The bioconversion includes pretreatment, hydrolysis, and fermentation. Various studies have been implemented for these two processes. Most existing literature focuses on a specific process, while very few of them consider the possible interactions between the two processes. In this paper, we investigated the relationship between the particle size in feedstock preprocessing and the sugar yield (proportional to biofuel yield) in bioconversion. The method of design of experiments was used to design experiments and analyze the experimental results of sugar yield with different particle sizes for three different types of biomass. Critical parameters that significantly influence the sugar yield were identified. The optimal configurations of the particle size were recommended.

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