scholarly journals New Materials in the Production of Moulding and Core Sands

2015 ◽  
Vol 15 (4) ◽  
pp. 25-28
Author(s):  
St. M. Dobosz ◽  
K. Major-Gabryś ◽  
A. Grabarczyk
Keyword(s):  
Thermal Properties ◽  
Bending Strength ◽  
Biodegradable Materials ◽  
Polymeric Binder ◽  
Biodegradable Material ◽  
New Materials ◽  
Biodegradation Rate ◽  
Lower Toxicity ◽  
Synthetic Resins ◽  
Cold Box

Abstract The article shows the influence of environment requirements on changes in different foundry moulding sands technologies such as cold box, self-hardening moulding sands and green sands. The aim of the article is to show the possibility of using the biodegradable materials as binders (or parts of binders’ compositions) for foundry moulding and core sands. The authors concentrated on the possibility of preparing new binders consisting of typical synthetic resins - commonly used in foundry practice - and biodegradable materials. According to own research it is presumed that using biodegradable materials as a part of new binders’ compositions may cause not only lower toxicity and better ability to reclaim, but may also accelerate the biodegradation rate of used binders. What’s more, using some kinds of biodegradable materials may improve flexibility of moulding sands with polymeric binder. The conducted research was introductory and took into account bending strength and thermal properties of furan moulding sands with biodegradable material (PCL). The research proved that new biodegradable additive did not decrease the tested properties.

scholarly journals Effect of Organo-Modified Montmorillonite Nanoclay on Mechanical, Thermo-Mechanical, and Thermal Properties of Carbon Fiber-Reinforced Phenolic Composites

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 754
Author(s):  
Jantrawan Pumchusak ◽  
Nonthawat Thajina ◽  
Watcharakorn Keawsujai ◽  
Pattarakamon Chaiwan
Keyword(s):  
Thermal Properties ◽  
Carbon Fiber ◽  
Bending Strength ◽  
Mechanical And Thermal Properties ◽  
Fiber Reinforced ◽  
Heat Resistant ◽  
Degradation Temperature ◽  
Modified Montmorillonite ◽  
Carbon Fiber Reinforced ◽  
Montmorillonite Nanoclay

This work aims to explore the effect of organo-modified montmorillonite nanoclay (O-MMT) on the mechanical, thermo-mechanical, and thermal properties of carbon fiber-reinforced phenolic composites (CFRP). CFRP at variable O-MMT contents (from 0 to 2.5 wt%) were prepared. The addition of 1.5 wt% O-MMT was found to give the heat resistant polymer composite optimum properties. Compared to the CFRP, the CFRP with 1.5 wt% O-MMT provided a higher tensile strength of 64 MPa (+20%), higher impact strength of 49 kJ/m2 (+51%), but a little lower bending strength of 162 MPa (−1%). The composite showed a 64% higher storage modulus at 30 °C of 6.4 GPa. It also could reserve its high modulus up to 145 °C. Moreover, it had a higher heat deflection temperature of 152 °C (+1%) and a higher thermal degradation temperature of 630 °C. This composite could maintain its mechanical properties at high temperature and was a good candidate for heat resistant material.

Flammability Test for Granular Synthetic Resins by the Modified Oxygen Index Method

1997 ◽  
Vol 15 (2) ◽  
pp. 126-143
Author(s):  
Yusaku Iwata ◽  
Eiji Yanai
Keyword(s):  
Thermal Properties ◽  
Oxygen Index ◽  
Index Method ◽  
Flammability Test ◽  
Synthetic Resins

A new oxygen index method is developed for testing the flamma bility of the granular synthetic resins. The oxygen index values of several granular resins are able to be determined by this method. The oxygen index values obtained by this method are compared with those obtained by the con ventional method. The granular samples used here are mainly classified into three groups, according to their thermal properties.

Investigation on Shear Behaviour of Flax-Kenaf Hybrid Composite

2014 ◽  
Vol 1051 ◽  
pp. 139-142 ◽  
Author(s):  
V.S. Srinivasan ◽  
S. Rajendra Boopathy ◽  
B. Vijaya Ramnath
Keyword(s):  
Hybrid Composite ◽  
Raw Materials ◽  
Technological Development ◽  
Fiber Composites ◽  
Shear Behaviour ◽  
Biodegradable Material ◽  
New Materials ◽  
Double Shear ◽  
Environmental Friendly ◽  
Shear Property

The present technological development makes us to find and fabricate new materials to replace existing materials. Also, the need for environmental friendly, easily biodegradable material plays prime role in determining the raw materials. In this paper Flax and Kenaf fibres are used as the suspending matrix to form hybrid composite with epoxy resin. Hand layup technique is carried out in this work to fabricate composite laminate. The double shear property is evaluated. The result shows that the hybrid composite shows better property than mono fiber composites.

Evaluation of new technologies and materials for printed circuit boards with improved heat dissipation properties

Circuit World ◽  
2016 ◽  
Vol 42 (1) ◽  
pp. 32-36 ◽  
Author(s):  
Michal Baszynski ◽  
Edward Ramotowski ◽  
Dariusz Ostaszewski ◽  
Tomasz Klej ◽  
Mariusz Wojcik ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Printed Circuit Boards ◽  
Heat Dissipation ◽  
Printed Circuit Board ◽  
New Technologies ◽  
Electronic Device ◽  
Circuit Board ◽  
New Materials ◽  
Content Type ◽  
Printed Circuit

Purpose – The purpose of this paper is to evaluate thermal properties of printed circuit board (PCB) made with use of new materials and technologies. Design/methodology/approach – Four PCBs with the same layout but made with use of different materials and technologies have been investigated using thermal camera to compare their thermal properties. Findings – The results show how important the thermal properties of PCBs are for providing effective heat dissipation, and how a simple alteration to the design can help to improve the thermal performance of electronic device. Proper layout, new materials and technologies of PCB manufacturing can significantly reduce the temperature of electronic components resulting in higher reliability of electronic and power electronic devices. Originality/value – This paper shows the advantages of new technologies and materials in PCB thermal management.

Studies on Mechanical and Thermal Properties of Epoxy Resin Modified by Fluorine-Containing Silicone

2013 ◽  
Vol 401-403 ◽  
pp. 713-716
Author(s):  
Cheng Fang ◽  
Dong Bo Guan ◽  
Wei Guo Yao ◽  
Shou Jun Wang ◽  
Hui An
Keyword(s):  
Glass Transition ◽  
Thermal Properties ◽  
Epoxy Resin ◽  
Bending Strength ◽  
Mechanical And Thermal Properties ◽  
Curing Agent ◽  
Epoxy System ◽  
Resin Curing ◽  
The Impact ◽  
Modified Epoxy

The epoxy resin was modified with the mixture of α,ω-dihydroxy poly-(3,3,3-trifluoropropyl) siloxane (PTFPMS), KH560 and stannous octoate. KH560 can react with PTFPMS and also epoxy resin curing agent. The two reactions were characterized by FI-IR. The modified epoxy resin was characterized by FI-IR. The result showed that fluorine-containing silicone had been successfully introduced into the epoxy system. The mechanical and thermal properties of the modified epoxy resin were analyzed. The results showed that with the increase of PTFPMS the impact strength of epoxy resin increased, hardness and bending strength correspondingly reduced, slight decrease in the glass transition temperature.

Utilization of Recycled Fine-Ground Concrete from Railway Sleepers for Production of Cement-Based Binder

2013 ◽  
Vol 486 ◽  
pp. 323-326 ◽  
Author(s):  
Martin Lidmila ◽  
Pavel Tesárek ◽  
Tomáš Plachy ◽  
Zuzana Rácová ◽  
Pavel Padevět ◽  
...  
Keyword(s):  
Material Properties ◽  
Cost Reduction ◽  
Bending Strength ◽  
Civil Engineering ◽  
Environmental Awareness ◽  
New Materials ◽  
Potential Cost ◽  
Curing Conditions ◽  
Secondary Use

The environmental awareness and potential cost reduction have promoted the recycling of materials in civil engineering. This paper is dealing with the recycling and secondary use of old concrete railway sleepers for reconstruction of old railway lines. In particular, it is focused on the investigation of material properties of a binder prepared from finely crushed old concrete sleepers. This material could be used for strengthening of subsoil and embankments supporting the railway structures. The study shows that the compressive and bending strength of the investigated material is sufficient for this purpose and that the strength can be further increased by suitable curing conditions. These findings could contribute to the utilization of old concrete sleepers during railway reconstructions and safe money spent for the purchase of new materials and disposal of old sleepers.

scholarly journals The Compositions: Biodegradable Material - Typical Resin, as Moulding Sands’ Binders

2015 ◽  
Vol 15 (1) ◽  
pp. 35-40
Author(s):  
K. Major-Gabryś ◽  
St. M. Dobosz ◽  
D. Drożyński ◽  
J. Jakubski
Keyword(s):  
Thermal Deformation ◽  
Thermal Destruction ◽  
Biodegradable Materials ◽  
Biodegradable Material ◽  
Points Of View

Abstract The paper presents possibility of using biodegradable materials as parts of moulding sands’ binders based on commonly used in foundry practice resins. The authors focus on thermal destruction of binding materials and thermal deformation of moulding sands with tested materials. All the research is conducted for the biodegradable material and two typical resins separately. The point of the article is to show if tested materials are compatible from thermal destruction and thermal deformation points of view. It was proved that tested materials characterized with similar thermal destruction but thermal deformation of moulding sands with those binders was different.

Controlling the Biodegradation Rate of AZ31 with Biomimetic Apatite Coating

2013 ◽  
Vol 821-822 ◽  
pp. 1047-1050 ◽  
Author(s):  
Ya Jing Zhang ◽  
Xiao Hui Xi ◽  
Hai Long Jia ◽  
Dan Zhang
Keyword(s):  
Body Fluid ◽  
Degradation Rate ◽  
Biodegradable Material ◽  
Biodegradation Rate ◽  
Natural Bone ◽  
Ha Coating ◽  
Biomimetic Apatite ◽  
Apatite Coating ◽  
Degradation Test ◽  
Orthopedic Applications

Magnesium alloys have the potential as a biodegradable material for orthopedic applications. However, severely corrosion in a physiological environment limits the clinical application of Mg alloys. Hydroxyapatite is the main composition of natural bone, it has excellent bioactivity and osteoconductivity. In this paper, the samples of AZ31 were ultrasonically cleaned using distilled water, and then the coating was formed on the surfaces of the samples by biomimetic process. The samples were subsequently immersed in the simulated body fluid (SBF) for the degradation test. The coatings were characterized by XRD, EDS and SEM. The results showed that hydroxyapatite (HA) coating was formed on the surface of AZ31 after 24h by biomimetic process; the HA coating greatly decreased the corrosion rate of AZ31 substrate; the degradation rate of samples can be controlled by closely adjusting the hydroxyapatite coating.

scholarly journals Advanced G-MPS-PMMA Bone Cements: Influence of Graphene Silanisation on Fatigue Performance, Thermal Properties and Biocompatibility

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 139
Author(s):  
Eva Paz ◽  
Yolanda Ballesteros ◽  
Juana Abenojar ◽  
Nicholas Dunne ◽  
Juan C. del Real
Keyword(s):  
Thermal Properties ◽  
Bone Cement ◽  
Bending Strength ◽  
Mechanical Performance ◽  
Fatigue Loading ◽  
Negative Influence ◽  
Fatigue Performance ◽  
Bone Cements ◽  
Bending Modulus ◽  
Pmma Bone Cement

The incorporation of well-dispersed graphene (G) powder to polymethyl methacrylate (PMMA) bone cement has been demonstrated as a promising solution to improving its mechanical performance. However, two crucial aspects limit the effectiveness of G as a reinforcing agent: (1) the poor dispersion and (2) the lack of strong interfacial bonds between G and the matrix of the bone cement. This work reports a successful functionalisation route to promote the homogenous dispersion of G via silanisation using 3-methacryloxypropyltrimethoxy silane (MPS). Furthermore, the effects of the silanisation on the mechanical, thermal and biocompatibility properties of bone cements are presented. In comparison with unsilanised G, the incorporation of silanised G (G_MPS1 and G_MPS2) increased the bending strength by 17%, bending modulus by 15% and deflection at failure by 17%. The most impressive results were obtained for the mechanical properties under fatigue loading, where the incorporation of G_MPS doubled the Fatigue Performance Index (I) value of unsilanised G-bone cement—meaning a 900% increase over the I value of the cement without G. Additionally, to ensure that the silanisation did not have a negative influence on other fundamental properties of bone cement, it was demonstrated that the thermal properties and biocompatibility were not negatively impacted—allowing its potential clinical progression.

scholarly journals Formation and EPR response of europium-yttria micro rods

2019 ◽  
Vol 1 (1) ◽  
pp. 53-56
Author(s):  
Silas Cardoso Dos Santos ◽  
Orlando Rodrigues Júnior ◽  
Letícia Lucente Campos
Keyword(s):  
Thermal Properties ◽  
Gamma Radiation ◽  
Dose Response ◽  
Radiation Dosimetry ◽  
Response Evaluation ◽  
Response Behavior ◽  
New Materials ◽  
Dense Microstructure ◽  
Innovative Materials

Designing new materials with suitable dose-response efficiency is a great challenge in radiation dosimetry search. Yttria (Y2O3) has excellent optical, mechanical, chemical, and thermal properties. Besides, yttria exhibits crystal characteristics that provide insertion of other rare earths, forming innovative materials. Nevertheless, there are quite few studies on formation, microstructural and EPR response evaluation of yttria. This work reports the formation and EPR characterization of europium-yttria micro rods for radiation dosimetry. Ceramic rods obtained by sintering at 1600ºC/4h in air were exposed to gamma radiation with doses from 1Gy to 150kGy. Particle, microstructural and dosimetry characterizations were performed by PCS, XRD, SEM, OM, and EPR techniques. As sintered europium-yttrium rods exhibited dense microstructure (90% theoretical density) and linear EPR dose response behavior up to 10kGy. These results show that europium-yttria is a promising material for radiation dosimetry.  

Sign in / Sign up

Export Citation Format

Share Document