Surface Properties of Laser-etched LTCC Ceramic

In the LTCC process, metal layers are usually deposited by screen printing conductor material on unfired tape substrate. Despite being widely used, this method has certain disadvantages, such as limited resolution of the printing process. An alternative method of producing conductor patterns is to deposit a uniform conductor paste layer on the substrate and the use a Nd:YAG laser to selectively ablate the conductor material, producing a desired pattern. This method allows achieving a higher patterning precision and also eliminates photochemical process of screen preparation, which makes it an attractive choice for rapid prototyping applications. Laser ablation step can be performed either post-firing (for a top conductor layer) or pre-firing (which allows for patterning buried layers). The aim of this paper is to investigate surface properties of LTCC ceramics processed by laser etching. Precision optical imaging and SEM are used to determine etched surface properties, and EDS analysis is used to determine its chemical composition. Effectiveness of conductor removal is investigated by comparing surface resistivity and metal content in raw and etched samples.

Download Full-text

The chemical composition and heavy metal content of sesame oil produced by different methods: A risk assessment study

Food Science & Nutrition ◽

10.1002/fsn3.2245 ◽

2021 ◽

Author(s):

Somayeh Kheirati Rounizi ◽

Fateme Akrami Mohajeri ◽

Hamdollah Moshtaghi Broujeni ◽

Fatemeh Pourramezani ◽

Sara Jambarsang ◽

...

Keyword(s):

Risk Assessment ◽

Heavy Metal ◽

Chemical Composition ◽

Metal Content ◽

Sesame Oil ◽

Heavy Metal Content ◽

Assessment Study

Download Full-text

Cellulose Compound of Cacao Waste and Chemical Composition of Cacao Vinegar with GC-MS Method

JKPK (Jurnal Kimia dan Pendidikan Kimia) ◽

10.20961/jkpk.v2i3.11974 ◽

2018 ◽

Vol 2 (3) ◽

pp. 191 ◽

Cited By ~ 1

Author(s):

Mohammad Wijaya. M ◽

Muhammad Wiharto ◽

Muhammad Anwar

Keyword(s):

Acetic Acid ◽

Chemical Composition ◽

Pyrolysis Temperature ◽

Propanoic Acid ◽

Cellulose Content ◽

Butanoic Acid ◽

Liquid Smoke ◽

Eds Analysis ◽

Shell Waste ◽

Cocoa Shell

<p>Potential of cacao resources at Indonesian is very dependent on the production of cacao produced by farmers and plantation availability. However, the cacao processing results are still not optimal to increase the cacao production. This is due to the disruption of pests and the number of cacao farmers over land functions for fast growing plants. Processing cacao produced cacao waste and with the use of pyrolysis technology is able to cope with the accumulation of plantation waste. This combustion results in liquid smoke of cacao (cacao vinegar) into distillate, charcoal. This study used pyrolysis temperature between 100-500 °C. The aim of this research is to analyze the cocoa waste and the results are cellulose content 17,27%, lignin 52,02% and hemicellulose 19,56%. The results of GC-MS analysis for cacao vinegar of Distric Wajo are acetic acid, n butane, methyl ester, propanoic acid, butanoic acid, cyclopenanone, 2 methyl pyridine, acetyloxy 2 propanone, butyrolactone, tetrahydro 2 furan methanol, 2,3 dimethyl 2 cyclopentene 1 on and Mequinol. The water content of the charcoal of cacao shell from Wajo district is 3.42%. The analysis results of the bound carbon content of activated charcoal of cacao shell is 54.45%. The EDS analysis for cacao shell from Wajo district resulted in C: 61.12%, O: 36.65%, Si: 0.59%, P: 1.48% and Al: 0.17%. Utilization of cocoa shell waste using pyrolysis technology can reduce carbon emissions to the environment. So that the development of everything can continue and the sustainability of forest remain sustainable.</p><p> </p>

Download Full-text

Influence of Chromium on the Chemical Composition and Surface Properties of Rapidly Solidified Al–Cr Alloys

Journal of Surface Investigation X-ray Synchrotron and Neutron Techniques ◽

10.1134/s102745102001019x ◽

2020 ◽

Vol 14 (1) ◽

pp. 66-72

Author(s):

I. I. Tashlykova-Bushkevich ◽

V. G. Shepelevich ◽

M. Amati ◽

L. Gregoratti ◽

M. Kiskinova

Keyword(s):

Chemical Composition ◽

Surface Properties ◽

Rapidly Solidified

Download Full-text

Influence of Thermal Modification on Surface Properties and Chemical Composition of Beech Wood (Fagus sylvatica L.)

Drvna industrija ◽

10.5552/drind.2016.1520 ◽

2016 ◽

Vol 67 (1) ◽

pp. 65-71 ◽

Cited By ~ 3

Author(s):

Josip Miklečić ◽

Vlatka Jirouš-Rajković

Keyword(s):

Chemical Composition ◽

Surface Properties ◽

Fagus Sylvatica ◽

Beech Wood ◽

Thermal Modification ◽

Fagus Sylvatica L

Download Full-text

Evaluation of the Influence of Pre-Alloyed Powder Fe65Nb on the Production of Metal Matrices by Powder Metallurgy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1012.3 ◽

2020 ◽

Vol 1012 ◽

pp. 3-8

Author(s):

A.C.G. Silva ◽

Hellen C.P. Oliveira ◽

Thales Eduardo Leal ◽

Paulo Santos Assis

Keyword(s):

Mechanical Properties ◽

Powder Metallurgy ◽

Chemical Composition ◽

Solid State ◽

Hot Pressing ◽

Physical And Mechanical Properties ◽

Toxic Element ◽

Alloyed Powder ◽

Eds Analysis ◽

Porosity Measurements

The objective of this paper is to study Fe65Nb-Cu metal matrices, thus varying the content of the pre-alloyed Fe65Nb powder from 10% to 100%. Therefore, powders of Fe65Nb and Cu were used, innovating in the chemical composition of the commonly used matrices. The objective is to evaluate the substitution of Co (toxic element, commonly used) by Nb (98.2% of reserves are Brazilian). For the sintering of the samples it was used hot pressing technique. The parameters were set at: 850°C / 35MPa / 3min. The sintered bodies underwent SEM/EDS analysis and density and porosity measurements were performed. From the results it is possible to say that the compositions of (10% and 30% Fe65Nb) presented the best physical and mechanical properties. The relative density decreases for the compositions with 40%, 50% and 60% Fe65Nb is justified by the presence of fragile particles in metal matrices, since they require more energy in order to efficiently transport matter (diffusion) in a solid state.

Download Full-text

The Structure and Mechanical Properties of Ni-Mo PM Steels with Addition of Mn And Cu

Powder Metallurgy Progress ◽

10.1515/pmp-2017-0005 ◽

2017 ◽

Vol 17 (1) ◽

pp. 37-46

Author(s):

E. Lichańska ◽

P. Kulecki ◽

K. Pańcikiewicz

Keyword(s):

Mechanical Properties ◽

Chemical Composition ◽

Tensile Properties ◽

Nickel Powder ◽

Three Dimensional ◽

Mechanical Tests ◽

Low Carbon ◽

Alloyed Powder ◽

Filamentary Structure ◽

Eds Analysis

Abstract The aim of the study was to evaluate the effect of chemical composition on the structure and mechanical properties of Mn-Ni-Mo and Ni-Mo-Cu PM steels. Pre-alloyed powder Astaloy 85Mo, diffusion alloyed powders Distaloy AQ and Distaloy AB produced by Höganäs, low carbon ferromanganese, carbonyl nickel powder T255 with three-dimensional filamentary structure and graphite CU-F have been used as the basic powders. Three mixtures with compositions of Fe-1%Mn-(0.5/1.75)%Ni-(0.5/0.85)%Mo-0.8%C and Fe-1.75%Ni-0.5%Mo-1.5%Cu-0.8%C were prepared in a Turbula mixer. Green compacts were single pressed in a steel die at 660 MPa according to PN-EN ISO 2740 standard. Sinterhardening was carried out at 1250°C in a mixture of 95% N2+5% H2 for 60 minutes. Mechanical tests (tensile, bend, hardness) and microstructural investigations were performed. Additionally, XRD and EDS analysis, fractographic investigations were carried out. The microstructures of steels investigated were mainly bainitic or bainitic-martensitic. Addition 1% Mn to Distaloy AQ based steel caused increase of tensile properties (YS from 422 to 489 MPa, UTS from 522 to 638 MPa, TRS from 901 to 1096 MPa) and decrease of plasticity (elongation from 3.65 to 2.84%).

Download Full-text

Physiochemical Effects of SiC and ZrO2 Particle Fillers on the Properties of Enamel Coatings

Coatings ◽

10.3390/coatings10020121 ◽

2020 ◽

Vol 10 (2) ◽

pp. 121 ◽

Cited By ~ 1

Author(s):

Hyunseok Ko ◽

Sung-Jin Lee ◽

Jae-Jong Oh ◽

Seungho Lee ◽

Hyung Mi Lim

Keyword(s):

Contact Angle ◽

Chemical Composition ◽

Surface Properties ◽

Enamel Coating ◽

Filler Content ◽

Enamel Surface ◽

Zro2 Particle ◽

Rich Phase ◽

Cooking Wares ◽

Ceramic Fillers

The ceramic particles of SiC and ZrO2 are embedded as fillers in the enamel coating with varying contents of 0.03, 0.05, and 0.1 wt %, and the surface properties are measured. It is found that the addition of ceramic fillers indeed causes changes in surface properties. The roughness was influenced mainly by the particle size embedded. The contact angle decreased at 0.03 and 0.05 wt % and equivalent to that of no filler at 0.10%. Our analysis suggested that the contact angle is influenced by both surface roughness and surface morphology (with chemical composition). The microstructure and elemental analysis suggest that the chemical composition and shape of Al, Ce, Ca, and P-rich aggregates on the enamel surface are showing significant changes when fillers are added. It is observed that the Al- and Ce-rich aggregates decrease both in number and size as the filler content increases, and Ca-rich aggregates change their shape from needle to spot at 0.1 wt % inclusion. The washability is notably improved at 0.1 wt %, which corresponds to the content where the drastic microstructure change occurred. The examination of the contaminated surface revealed that the phosphate component in the contamination has reacted with the Ca-rich phase of the needle-shape during the process of burning, thus inhibiting an easy removal of the contamination. Therefore, the formation of the Ca-rich phase of the needle-shape on the enamel surface should be suppressed for easy-cleaning enamel coatings for cooking wares.

Download Full-text

The Oxidation Resistance of Nonmodified and Zr-Modified Aluminide Coatings Deposited by the CVD Method

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.227.361 ◽

2015 ◽

Vol 227 ◽

pp. 361-364

Author(s):

Ryszard Filip ◽

Maryana Zagula-Yavorska ◽

Maciej Pytel ◽

Jolanta Romanowska ◽

Mateusz Maliniak ◽

...

Keyword(s):

Chemical Composition ◽

Oxidation Resistance ◽

Protective Coating ◽

Aluminide Coating ◽

Nickel Superalloy ◽

Cvd Method ◽

Aluminide Coatings ◽

Eds Analysis ◽

Nial Phase

The aim of the present work was to determine the influence of chemical composition of the protective coating on the oxidation resistance of the protected alloy. Zirconium modified and nonmodified aluminide coatings were deposited on the MAR M200 nickel superalloy by the CVD method. The oxidation tests were conducted at 1100°C into 23 hour in the air. The chemical composition (EDS) analysis was performed. The kinetic of oxidation of zirconium modified and nonmodified aluminide coatings was similar. Oxides inclusions called pegs were observed on the surface of oxidized aluminide coating. HfO2 oxide is more stable than Al2O3 oxide, hafnium atoms can replace aluminum atoms in Al2O3 oxides. This phenomena let to stabilize NiAl phase and increase of oxidation resistance of aluminide coating.

Download Full-text

Depth of Laser Etching in Green State LTCC

Additional Conferences (Device Packaging HiTEC HiTEN & CICMT) ◽

10.4071/cicmt-2012-tp32 ◽

2012 ◽

Vol 2012 (CICMT) ◽

pp. 000136-000141 ◽

Cited By ~ 1

Author(s):

Krzysztof Zaraska ◽

Monika Machnik ◽

Adam Bieńkowski ◽

Beata Synkiewicz

Keyword(s):

Rapid Prototyping ◽

Screen Printing ◽

Processing Parameters ◽

Pulse Frequency ◽

Precision Manufacturing ◽

Laser Etching ◽

Etching Depth ◽

Green State ◽

Power Pulse ◽

Practical Standpoint

Laser etching of green state LTCC is a useful rapid prototyping and precision manufacturing process. Laser etching allows selective removal of screen printed conductor layer, producing patterns with higher precision than conventional screen printing. Its usefulness for rapid prototyping is due to elimination of time consuming screen preparation process. The etching is performed using a near UV (355 nm), pulsed laser. The process is characterized by three parameters: laser power, pulse frequency, and etching speed. From the practical standpoint, we are interested in finding a combination of parameters which allows for achieving required etching depth at the maximum etching speed. We present an empirical mathematical model relating etching depth to process parameters, allowing to theoretically determine optimum processing parameters for a specified etching depth.

Download Full-text