Microstructure and compressive properties of carbon microballoons

Carlisle, K.; Koopman, M.; Chawla, K. K.; Kulkarni, Rahul R.; Gladysz, Gary M.; Lewis, Matthew W.

doi:10.1007/s10853-006-7574-8

Cited by 23 publications

(20 citation statements)

References 2 publications

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“…The uncoated CMBs were found to follow the trend of increasing average properties with tap density, as expected from prior research [5,6]. Thus, they were concluded to be a representative tap density of CMBs.…”

Section: Resultssupporting

confidence: 81%

“…As before, this is likely due to the trend toward increasing average wall thickness with tap density. Figures 4 and 5 show the main intra-tap density trends observed earlier [5,6], with the UC 0.192 g/cm 3 tap density data plotted alongside. As expected, compressive strain at failure was again nearly proportional to the inverse square root of CMB diameter, regardless of tap density, see Figure 4.…”

Section: Resultsmentioning

confidence: 74%

“…Since a three-phase syntactic foam can be conceptualized as a collection of single MBs coated in cured binder and held together by binder ligaments at the MB contact points, determination of the mechanical properties of coated CMBs provides valuable future constitutive modeling data on individual unit cells of these foams, while evaluating the performance of the coating. To evaluate the effect of the coating on the mechanical properties of the coated and uncoated CMBs, a previously published technique was adopted, whereby the uniaxial compressive properties of single CMBs were investigated by using a modified nanoindenter [5,6,9,12]. The available properties from this technique include stiffness, load, displacement, strain, and work of fracture.…”

Section: Introductionmentioning

confidence: 99%

“…After curing of the coating, APO-BMI-coated CMBs were compressed in the nanoindenter, and their compressive properties were determined. Uncoated CMBs were also evaluated, providing a control sample for comparison to both the coated samples and to the other tap densities previously tested [6]. The results of this comparison provide insight into the behavior of CMBs during compression of a three-phase syntactic foam and could be used to justify some decisions in the design of constitutive models for these materials.…”

Section: Introductionmentioning

confidence: 99%

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Uniaxial Compressive Properties of Bismaleamid-coated Carbon Microballoons

Carlisle

Chawla

Koopman

et al. 2007

Journal of Cellular Plastics

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A uniaxial compression technique employing a nanoindenter equipped with a flat-ended cylindrical tip is used to evaluate the performance of carbon microballoons (CMBs) precipitation-coated with a bismaleamid (APO-BMI) polymer. This coating will eliminate the size and density induced segregation of APO-BMI and CMBs during mold filling and the potentially damaging mixing step wherein CMBs and powdered binder pre-polymer are blended prior to foam molding. To augment the molding of syntactic foams directly from coated CMBs and to aid in the development of a constitutive model for a three-phase syntactic foam, mechanical property evaluation of the coated CMBs is needed. Cured, APO-BMI coated and uncoated CMBs (0.192 g/cm 3 tap density) are compressed uniaxially using a modified nanoindenter to obtain the compressive properties of the CMBs in both conditions. These properties included strain-to-failure, failure load, displacement-at-failure, and work of fracture. The 0.192 g/cm 3 tap density CMBs' behavior followed the prior inter-tap density trends between compressive strain and diameter and failure load versus stiffness. The coating is determined to have no statistically significant effect on the mechanical properties of the CMBs. From the combination of this information, the effect of an APO-BMI coating on CMBs of any tap density is inferred.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Uniaxial Compressive Properties of Bismaleamid-coated Carbon Microballoons

Carlisle

Chawla

Koopman

et al. 2007

Journal of Cellular Plastics

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“…Flawed single walled results were thought to be caused by irregularities or flaws in the surface and sphere wall. Nested results were thought to be caused by several internal compartments within the microsphere [25], [32], [33], [34]:…”

Section: : Microsphere Size Analysesmentioning

confidence: 99%

Crush Strength Analysis of Hollow Glass Microspheres

Dillinger

Clark

Suchicital

et al. 2018

Ceramic Engineering and Science Proceedings

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Porous Wall Hollow Glass Microspheres (PWHGMs) were developed by the Savannah River National Laboratory. What makes these microspheres unique is the interconnected porosity spread throughout their wall allowing various materials to travel from the surface to the hollow interior. With their characteristic porosity, the PWHGMs are a great tool for encapsulating or filtrating different materials. Unfortunately, there is little information available on the mechanical properties of PWHGMs. The main goal of this research was to develop a method to crush individual microspheres and statistically analyze the results. One objective towards completing this goal was to measure the microsphere diameter distribution. Microsphere diameter is a major factor affecting strength as well as the Weibull parameters. Two different methods, microscopy counting and laser light scattering, used in the research yielded similar distributions. The main objective of this research was to analyze the crush strength of individual microspheres. Using nanoindentation, data were collected to analyze the crush strength of PWHGMs in uniaxial compression. Nanoindentation data were used to analyze how the strength of the PWHGMs changes through the different stages of production and at different diameter ranges. Data for 3M commercial microspheres were compared to ARC microspheres. Most data were analyzed using a statistical technique known as the two parameter Weibull analysis. The data indicated that the strength generally decreased as the microsphere diameter increased. Scattering in the data was nearly the same across all sample sets tested. Results indicated that the PWHGMs were weaker than the ARC hollow glass microspheres (HGMs). This is primarily due to the addition of wall porosity in the PWHGM.

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