Thermal Analysis Studies of (Bi, Pb)-2223/Linear Low Density Polyethylene Composite Materials

Elsharkawy, S.G.; Mohammed, N. H.; Abdeen, W.; Abou‐Aly, A. I.; Awad, R.

doi:10.1007/s10948-010-0971-x

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…Furthermore, figure 1 shows that for every compound there has been a rapid non-linear decrement in the values of Vickers hardness parameters with the increase of microindentation test loads applied up to about 2.00 N above which the microhardness parameters have nearly remained constant. This situation resulted from the existence of the plateau regions related to the increase in the irreversible crystal structure problems, grain boundary weak interactions, cracking, and degree of granularity, non-recoverable stress amplification sites, and the distribution of irregular grain orientations in the Bi-2212 crystal structure depending on the applied test loads [28].…”

Section: Resultsmentioning

confidence: 99%

Change in transition balance between durable tetragonal phase and stress-induced phase of cobalt surface-layered in Bi-2212 materials by semi-empirical mechanical models

et al. 2023

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This study has indicated the positive effect of sintering temperature on the mechanical durability, strength, critical stress, deformation degrees, durable tetragonal phase, failure and fracture by fatigue, and mechanical characteristic behavior to the applied test loads for the Co surface-layered Bi-2212 ceramic materials produced by the standard solid-state reaction method. The sintering mechanism has been used as the driving force for the penetration of cobalt ions in the Bi-2212 ceramic matrix. The microindentation hardness test measurements have been performed at the load intervals 0.245 N-2.940 N. The experimental findings have also been examined by the six different semi-empirical mechanical and indentation-induced cracking models. It has been found that all the mechanical performance parameters are improved considerably with increasing the diffusion sintering temperature up to 650°C. On this basis, the Co surface-layered Bi-2212 sample produced at the sintering temperature of 650°C has been observed to improve dramatically the mechanical durability and resistance to the applied test loads as a consequence of the formation of new force barrier regions, surface residual compressive stress regions, and slip systems in the Bi-2212 ceramic system. Similarly, the optimum sintering temperature has extensively enhanced the elastic recovery mechanism, critical stress values, and deformation degree levels, stored internal strain, and crack surface energy through the Bi-2212 ceramic materials. Accordingly, it has been noted that the best sample produced at 650°C is more hardly broken than the other ceramics. Namely, the optimum sintering temperature has decreased the sensitivity to the applied test loads as a result of delaying the beginning of the plateau limit regions. On the other hand, all the mechanism has been found to reverse completely depending on the excess sintering temperature. Lastly, the indentation-induced cracking model has been found to exhibit the closest results to the original Vickers microhardness parameters in the plateau limit regions.

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Section: Resultsmentioning

confidence: 99%

Change in transition balance between durable tetragonal phase and stress-induced phase of cobalt surface-layered in Bi-2212 materials by semi-empirical mechanical models

et al. 2023

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“…As a well‐known fact, materials expand or contract when subjected to changes in temperature due to change in the free volume between the particles that constitute the materials. For LLDPE with relatively high coefficient of thermal expansion (CTE), expansion upon heating, and contraction upon cooling are particularly significant 12,13 . Therefore, the products made by this process have a problem of poor product dimensional stability over a wide temperature range, which undoubtedly creates a negative impact on the practical application and commercialization of the RM products.…”

Section: Introductionmentioning

confidence: 99%

“…For LLDPE with relatively high coefficient of thermal expansion (CTE), expansion upon heating, and contraction upon cooling are particularly significant. 12,13 Therefore, the products made by this process have a problem of poor product dimensional stability over a wide temperature range, which undoubtedly creates a negative impact on the practical application and commercialization of the RM products. Over the years, many efforts, such as introducing low CTE inorganic fillers in the polymer matrix, blending with inorganic negative thermal expansion materials, and so forth, have been devoted to improve the dimensional stability of polymers in the scientific and industrial communities.…”

Section: Introductionmentioning

confidence: 99%

Improved balance between dimensional stability, mechanical properties and processability of linear low density polyethylene for rotational molding

Gong

et al. 2023

J of Applied Polymer Sci

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The linear low density polyethylene (LLDPE) products made by rotational molding (RM) usually involve two main problems of poor dimensional stability and insufficient mechanical properties. Although the decline in thermal expansion coefficient and rise in mechanical strength can be attained by filling with inorganic particles, the melt fluidity of LLDPE, which is of great importance for RM, would be significantly reduced. In this study, a combination of crosslinker low‐temperature blending and partial chemical crosslinking strategy is employed to enhance the dimensional stability and mechanical properties of LLDPE without sacrificing the melt fluidity. The structure–property relationships in the crosslinked specimens are analyzed based on X‐ray diffraction, differential scanning calorimetry, thermogravimetric analysis, scanning electron microscopy, and dielectric spectrometry. The results show that our simple, low‐cost and universal strategy not only contributes to a better dimensional stability and significantly improved mechanical properties, but also endow the samples with promising processability and thermal stability.

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Improvement in deformation degree of Zr surface-layered Bi-2223 ceramics by diffusion annealing temperature

Mercan

Terzioğlu

Doğan

et al. 2023

Ceramics International

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Thermal Analysis Studies of (Bi, Pb)-2223/Linear Low Density Polyethylene Composite Materials

Cited by 3 publications

References 11 publications

Change in transition balance between durable tetragonal phase and stress-induced phase of cobalt surface-layered in Bi-2212 materials by semi-empirical mechanical models

Change in transition balance between durable tetragonal phase and stress-induced phase of cobalt surface-layered in Bi-2212 materials by semi-empirical mechanical models

Improved balance between dimensional stability, mechanical properties and processability of linear low density polyethylene for rotational molding

Improvement in deformation degree of Zr surface-layered Bi-2223 ceramics by diffusion annealing temperature

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