Polymer-derived SiCN composites with magnetic properties

2003 ◽  
Vol 18 (11) ◽  
pp. 2549-2551 ◽  
Author(s):  
Atanu Saha ◽  
Sandeep R. Shah ◽  
Rishi Raj ◽  
Stephen E. Russek
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Low Cost ◽  
Ceramic Composites ◽  
Processing Method ◽  
Silicon Carbonitride ◽  
Imperfect Interfaces ◽  
Elastic Resistance ◽  
Low Temperature Processing ◽  
Multifunctional Properties

Composites consisting of particles of α-iron dispersed in silicon carbonitride (SiCN) were fabricated by a polymer route. The composites had iron inclusions with the same magnetization as bulk iron, but they resisted oxidation up to 500°C and had a hardness of 5-7 GPa. The composites behaved as ferromagnets, albeit with a low susceptibility attributed to the pinning of the domains by imperfect interfaces and to the elastic resistance from the SiCN matrix. This low-cost, low-temperature processing method can be used to make different kinds of ceramic composites with multifunctional properties.

Epoxy Nanocomposite Capacitors for Application as MCM-L Compatible Integral Passives

2001 ◽  
Vol 124 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Swapan K. Bhattacharya ◽  
Rao R. Tummala
Keyword(s):  
Low Cost ◽  
Ceramic Composites ◽  
Material System ◽  
Large Area ◽  
Passive Components ◽  
Capacitance Density ◽  
Glass Substrates ◽  
Ceramic Thin Films ◽  
Low Temperature Processing ◽  
Novel Material

Polymer/ceramic composite emerges as a novel material system for application as integral capacitors for the next generation of microelectronic industry where the discrete passive components such as capacitors, resistors, and inductors are likely to be replaced by the embedded components. In this study, epoxy based nanocomposites are selected due to their low-cost and low temperature processing advantages in comparison to the traditional polymers used in the microelectronic industry today. Other potential advantages of epoxy materials could be their aqueous based fabrication process and availability in the form of dry films for direct lamination onto substrates. This paper reports dielectric properties of epoxy nanocomposites made from three commercially available resin composites (i) a solvent based photodefinable epoxy, (ii) an aqueous based photodefinable epoxy, and (iii) a non-photodefinable epoxy. Possible avenues for achieving higher capacitance density in polymer/ceramic composites for future needs have been discussed. Deposition of polymer/ceramic thin films on a 300 mm×300 mm PWB and glass substrates has been demonstrated using a state-of-the-art meniscus coater. The end goal of this study is to develop a defect-free manufacturable process for depositing and patterning particulate epoxy composite capacitors on large area PWB substrates. It is believed that the large area process will reduce the overall manufacturing costs and increase process yield, thus facilitate the economic viability of the integral passive technology.

Synthesis and Low Temperature Magnetic Properties of Metal Elements Filled Polymer-Derived SiCN Ceramic Composites

2007 ◽  
Vol 546-549 ◽  
pp. 2269-2272 ◽  
Author(s):  
Xue Yan ◽  
Xiao Nong Cheng ◽  
Chang Sheng Li ◽  
Ralf Hauser ◽  
Ralf Riedel
Keyword(s):  
Magnetic Properties ◽  
Magnetic Property ◽  
Low Temperature ◽  
Measurement System ◽  
Ceramic Composites ◽  
Metal Elements ◽  
Rich Domain ◽  
Metal Ceramic ◽  
Property Measurement ◽  
Properties Of Composites

The metal elements, such as Fe, Mn, Co, Ni, Ni-Mn, Co-Mn and Fe-Mn, were mixed and milled with pre-cross-linked polysilazane Ceraset® and subsequent pyrolysis. The metals act as active fillers to increase the density of composite. The phases and microstructures of metal/ceramic composites were studied using XRD, SEM and EDS, and the magnetic property was measured with Magnetic Property Measurement System at –196oC. The results show that there are two main domains in composites, one is metal-rich domain and another is metal-poor domain. The density of composite is larger than that of polymer-derived SiCN ceramic, but the hardness varies little. The compound generated by the reaction between metal and matrix has great effect on the magnetic properties of composites, which are filled with different metals.

Magnetic properties of nanostructured CoxFe3−xO4 (0

2007 ◽  
Vol 434-435 ◽  
pp. 637-640 ◽  
Author(s):  
Gabriel Caruntu ◽  
Adelle Newell ◽  
Daniela Caruntu ◽  
Charles J. O’Connor
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Low Temperature ◽  
Processing Method ◽  
Solution Processing

Combustion Synthesis of Hydroxyapatite and Hydroxyapatite (Silver) Powders

2008 ◽  
Vol 396-398 ◽  
pp. 411-419 ◽  
Author(s):  
R. Narayanan ◽  
Vijay Singh ◽  
Tae Yub Kwon ◽  
Kyo Han Kim
Keyword(s):  
Low Temperature ◽  
Combustion Synthesis ◽  
Synthesis Method ◽  
Processing Method ◽  
Tris Buffer ◽  
Silver Addition ◽  
Hydroxyapatite Powder ◽  
Low Temperature Processing ◽  
Ft Ir ◽  
Additional Phase

Hydroxyapatite powder is produced using combustion synthesis method. The powder was produced using a low-temperature processing method involving time as short as 15 minutes. As silver is known to have anti-bacterial properties, silver-doped hydroxyapatite was also produced by the same method. Both the powders were fully crystalline. XRD indicated the presence of an additional phase of CaO in both the samples. FT-IR indicated the presence of hydroxide, phosphate and carbonate groups. Silver addition tends to control the reactions of powder with a test Tris buffer environment and maintain a stable pH for a longer period of 500-hour duration.

Low-Temperature Processing Method of Preparing for Transparent Graphene Oxide Electrode Film with Better Electrical Properties

2012 ◽  
Vol 12 (5) ◽  
pp. 4294-4298 ◽  
Author(s):  
Jin Ho Kim ◽  
Jae Mok Jung ◽  
Jun Young Kwak ◽  
Seung-Soo Hong ◽  
Yeong-Soon Gal ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrical Properties ◽  
Low Temperature ◽  
Processing Method ◽  
Oxide Electrode ◽  
Low Temperature Processing
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