scholarly journals A Development Methodology for Copper End Termination Paste — Part 1: Origin of Green Defects

2002 ◽  
Vol 25 (2) ◽  
pp. 169-179 ◽  
Author(s):  
Umesh Kumar
Keyword(s):  
Material Selection ◽  
Flow Behavior ◽  
Process Condition ◽  
Viscoelastic Behavior ◽  
Acrylic Resin ◽  
Nitrogen Atmosphere ◽  
Raw Material ◽  
Development Methodology ◽  
Drying Conditions ◽  
Raw Material Selection

Copper (Cu) based pastes have emerged as the termination materials of choice for ceramic capacitors with base metal internal electrodes. To prevent oxidation of nickel (Ni) internal electrode and the copper terminations, it is necessary to fire the terminations in a nitrogen atmosphere. This requirement places significant restrictions on raw material selection for the termination pastes. For example, acrylic-based resins are used as organic binder for their clean burning characteristics over the traditional ethyl cellulose based binder system. As the viscoelastic behavior of acrylic resin systems are different to those of cellulose systems, differences are observed in the flow behavior of the paste. In this paper, the influence of paste rheology on the green cosmetic defects such as mooning, peaking, etc. is discussed. Additionally, the influence of process condition such as dipping parameters, drying conditions etc., on the green cosmetic defects are discussed. Finally, properties of a copper termination, which can be processed between 800–825°C, are discussed.

β-Glucan content, viscosity, and solubility of Canadian grown oat as influenced by cultivar and growing location

2016 ◽  
Vol 96 (2) ◽  
pp. 183-196 ◽  
Author(s):  
Mariana Perez Herrera ◽  
Jun Gao ◽  
Thava Vasanthan ◽  
Feral Temelli ◽  
Kelly Henderson
Keyword(s):  
Material Selection ◽  
Flow Behavior ◽  
Raw Material ◽  
Flow Behavior Index ◽  
Shear Rates ◽  
Oat Cultivars ◽  
Oat Flour ◽  
Raw Material Selection ◽  
Insight Into ◽  
Behavior Index

The composition and physicochemical properties of oat flour with respect to β-glucan content and its solubility and viscosity were investigated. Eight oat cultivars grown in 20 prairie locations for three consecutive years were examined in this study to establish how cultivar, growing location, and their interaction influence the abovementioned attributes. It was found that the β-glucan content was primarily influenced by oat cultivar, while growing location and the interaction between cultivar and location had minimal effect. Among the eight cultivars, HiFi had the highest β-glucan content (5.82% w/w), while Derby had the lowest (4.37% w/w). Growing location, oat cultivar, and their interaction had a significant effect on β-glucan solubility and viscosity. The β-glucan solubility differed among oat cultivars, where 28.44–34.28% of the β-glucan present in the oat flour could be solubilized at 37°C. Viscosity was evaluated by consecutive fixed speed tests at shear rates of 1.29–129 s−1. Results showed that shear rate, growing location, and cultivar affected viscosity. The flow behavior index (n) for all β-glucan dispersions indicated shear-thinning behavior. HiFi had the highest β-glucan solubility and viscosity among all the cultivars analyzed. The findings provide insight into raw material selection and variations in raw material characteristics when targeting specific oat product applications.

Raw material selection and evidence for rhinoceros tooth tools at Dadong Cave, southern China

Antiquity ◽  
2000 ◽  
Vol 74 (284) ◽  
pp. 372-379 ◽  
Author(s):  
S. Miller-Antonio ◽  
L. A. Schepartz ◽  
D. Bakken
Keyword(s):  
Material Selection ◽  
Southern China ◽  
Raw Material ◽  
Raw Material Selection ◽  
Lower Palaeolithic

Research in Dadong Cave, southern China, has revealed evidence suggesting that nonlithic materials were used in the tool kits of the Chinese Lower Palaeolithic.

System modelling for economic raw material selection

1995 ◽  
Vol 33 (12) ◽  
pp. 3301-3310
Author(s):  
R. CHEN ◽  
O. HAWALESHKA ◽  
D. STRONG
Keyword(s):  
Material Selection ◽  
Raw Material ◽  
System Modelling ◽  
Raw Material Selection

Influencing Factors and New Developments of Fly Ash Based Geopolymer

2013 ◽  
Vol 831 ◽  
pp. 62-66
Author(s):  
Chen Si ◽  
Zhu Ge Yan ◽  
De Ping Xu
Keyword(s):  
Fly Ash ◽  
Lightweight Concrete ◽  
Material Selection ◽  
Cementitious Material ◽  
Raw Material ◽  
New Developments ◽  
Factors Affecting ◽  
High Calcium ◽  
Raw Material Selection ◽  
Geopolymer Composites

This paper presents a discussion of factors affecting the performance of fly ash based geopolymer, and some recent innovations on fly ash based geopolymer. The characteristics of fly ash based geopolymer are discussed in terms of the effects of raw material selection, alkaline activators, and curing procedures. Nowadays, researchers have used geopolymer as a cementitious material to develop innovative geopolymer materials, such as porous, fibre reinforced and foam fly ash based geopolymer concrete, which are greener than the traditional cementitious material. The high-calcium fly ashes could be used to produce porous fly ash based geopolymer composites with satisfactory mechanical properties. The addition of fibres increases greatly the ductility of geopolymer. Foam can be added to the geopolymeric mixture to produce lightweight concrete. However, the manufacturing of fly ash-based geopolymer foam concrete has not been explored too much.

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