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open porosity
Total open porosity and the most probable pore radius are determined by mercury porosity technique.
      
Ceramic materials with an open porosity of 37-42% are prepared.
      
After long-term irradiation, the elevated oxygen content in the metal and the formation of relatively bulky beryllium oxide film is due to the development of open porosity.
      
The effect of the respective pore characteristics, such as the volume fraction of open porosity and pore size distribution, on the microstructure of HAP/nylon hybrid composites is discussed.
      
Open porosity increased water uptake significantly only when no starch was added to the medium.
      
Here we have measured the fragmentation speed and the fragmentation threshold of five dacitic samples (6.7-53.5?vol% open porosity) from Unzen volcano, Kyushu, Japan.
      
Development of benign microstructure with open porosity has been attempted by varying the composition and firing conditions.
      
The ceramics prepared by sintering ultrafine powders at 1500°C had a density of ?6.0 g/cm3?, open porosity of ?4%, and closed porosity below 1%.
      
Optimizing the slurry composition and preparing quality slurries, we obtained a support material which had an open porosity of ?34% after firing at 1380°C.
      
The green density and hence the open porosity of the shapes were varied between 1.83 to 2.09 g/cc and 33.3 to 26.8 vol.%, respectively.
      
The materials of 3-4 times higher bending strength, lower water absorption as well decreased open porosity were prepared during these experiments.
      
There appears porous microstructure with 70% of open porosity and pore size distribution of 10-115 um in the composite.
      
Measuring gas diffusion for the valuation of open porosity on mortars and concretes
      
The water absorption, open porosity, and apparent density of the obtained samples are determined.
      
It is established that introduction of 1% sintering additive in the GLMK alumina makes it possible at 1450°C to obtain ceramics with zero open porosity, a mean density of 3.84 g/cm3, and a bending strength of 310 ± 40 MPa.
      
Conditions for producing porous and sufficiently strong material with open porosity 45% and compressive strength 57 MPa molded at a unit pressure of 10 MPa are established.
      
A ceramic material with a mean density of 4.01 g/cm3, three-point bending strength 380 ±20 MPa, a size of corundum crystal equal to 4 - 6 μm, and zero open porosity is obtained, which can be used in endoprostheses caps for coxofemoral joints.
      
Porous ceramics with open porosity up to 40% and bending strength up to 25 MPa is obtained, which has high filtration efficiency and chemical stability.
      
The volume of open porosity decreased with an activation energy of 4.6 J mol-1 at a rate controlled by grain growth.
      
The volume of open porosity decreased with an activation energy of 4.6 J mol-1 at a rate controlled by grain growth.
      
 

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