Multilayer ceramics composition

Ag-Pd Alloy Powders (7,27). Bimetallic colloids, namely, Ag-Pd and Au-Pt, can be obtained by the polyol process. The composition Ag7oPdx> is of particular interest to make the internal electrodes of multilayer ceramic capacitors (MLCC). Polymer-protected, monodisperse, nanoscale Ag70Pd30 particles have been obtained... 

Yaroshenko, V., Orlovskaya, N., Einarsrud, M.-A., Kovylayev, V., Processing of multilayered Si3N4-TiN hot-pressed ceramic composites, in Proceedings of NATO ARW Multilayered and Fibre-reinforced Composites Problems and Prospects , Kluwer, Dordrecht, 1998. 

Colomban, P, Menet, M., Mouchon, E., Courtemanche, C., and Parlier, M., Composites ceramique-ceramique multicouches elabo-res en utihsant un precur-seur d interface et un precurseur de matrice [Multilayer fiber-matrix ceramic composite material and process for its production], French Patent nos. (ONERA) FR 2672283 (Feb. 4, 1991) and EP 0 498 698 (Jan. 29, 1992), and U.S. Patent no. 07/830.904. 

Chang, D. D., Electrical characteristics and reliability study of high-K lead-based multilayer ceramic capacitors, in Ceramic Dielectrics Composition, Processing and Properties, Ceramic Transactions, Vol. 8, (H. C. Ling and M. F. Yan, eds.). Am. Ceram. Society, Westerville, OH 1990, p. 88. 

The information about nanocrystalline ferroic powders fabricated by various chemical synthesis technologies is reported in Table 5.2. Their possible applications are also listed. Powders of the same ferroics for two different applications might be obtained by different techniques since the requirements of size distribution, morphology, agglomeration and impurity composition are determined by different technological conditions. For example, barium titanate is a dielectric with high dielectric constant and it is widely used in multilayer ceramic capacitors, whereas semiconducting properties of rare-earth doped BaTiOs are important for thermistors. 

The first step in the production of multilayer ceramics — LTCC, MTCC, or HTCC — involves the casting of a thin ceramic-organic composite tape. There are a number of key parameters associated with the casting of these tapes [15]. They include ... 

Ceramic substrates are typically composites of crystalline and noncrystalline phases. The composition of the substrate is, of course, a function of the inorganic (and organic) components incorporated as raw materials. Alumina multilayer ceramics are produced from mixfures of powders with controlled purity, homogeneity, surface and bulk chemisfry and crysfallography, particle size and particle size distribution, surface area and morphology, including agglomeration [16]. 

Exemplary Composition of Commercial Aluminum Oxide Multilayer Ceramics... 

Properties of Glass-Ceramic Composites Used as Multilayer Substrates (Nippon Electric Glass Co., Japan) ... 

To improve migration resistance, in Ag-Pd with Pd added to Ag, the palladium oxidizes in the atmosphere from 450°C to 800°C, and at high temperature it deoxidizes, transforming to metal palladium. The oxidation reaction at this low temperature causes volume expansion of the conductor element, and during the firing process, it is the cause of delamination of the multilayer ceramic [37]. In the same Ag-Pd composition, the degree of... 

Two fuel forms have the potential to satisfy the GFR requirements (1) a ceramic plate-type fuel element and (2) a ceramic pin-type fuel element. The reference material for the structure is reinforced ceramic comprised of a sUicon carbide composite matrix ceramic. The fuel compound is made of pellets of mixed uranium-plutonium-minor actinide carbide. A leak-tight barrier made of a refractory metal or of Si-based multilayer ceramics is added to prevent fission products from diffusing through the clad [1]. 

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