Wood fibreboard paraffin hydrophobization and the impact of this treatment on the board surface finishing quality

2019 ◽  
Vol 107 ◽  
pp. 115-123
Author(s):  
JOZEF KÚDELA
Keyword(s):  
Surface Treatment ◽  
Thermodynamic Characteristics ◽  
Surface Finishing ◽  
Drying Rate ◽  
Coating Materials ◽  
Board Surface ◽  
Coating Layers ◽  
The Impact

Wood fibreboard paraffin hydrophobization and the impact of this treatment on the board surface finishing quality. The aim of this paper is to analyse the causes of surface treatment defects in commercially produced wood fibreboards (FB). The analysis of: the obtained (measured and calculated) thermodynamic characteristics and of the results of microscopic examinations demonstrated that the excessive FB hydrophobization with paraffin may cause the paraffin to release from the FB surface and to migrate into the first primer layer. For the sanded FBs, similar paraffin migration was also observed into the second primer layer. This entailed lowered drying rate for the coating materials applied on FB, lower adhesion of the coating materials to the substrate and also lower adhesion between the particular coating layers applied. At the same time, the occurring frequency of surface treatment defects increased.

scholarly journals Recent Developments in Coatings for Orthopedic Metallic Implants

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 791
Author(s):  
Muzamil Hussain ◽  
Syed Hasan Askari Rizvi ◽  
Naseem Abbas ◽  
Uzair Sajjad ◽  
Muhammad Rizwan Shad ◽  
...  
Keyword(s):  
Stress Shielding ◽  
Orthopedic Implant ◽  
Coating Materials ◽  
Implant Materials ◽  
Metallic Implants ◽  
Common Causes ◽  
Recent Developments ◽  
Orthopedic Applications ◽  
The Impact ◽  
Cocrmo Alloys

Titanium, stainless steel, and CoCrMo alloys are the most widely used biomaterials for orthopedic applications. The most common causes of orthopedic implant failure after implantation are infections, inflammatory response, least corrosion resistance, mismatch in elastic modulus, stress shielding, and excessive wear. To address the problems associated with implant materials, different modifications related to design, materials, and surface have been developed. Among the different methods, coating is an effective method to improve the performance of implant materials. In this article, a comprehensive review of recent studies has been carried out to summarize the impact of coating materials on metallic implants. The antibacterial characteristics, biodegradability, biocompatibility, corrosion behavior, and mechanical properties for performance evaluation are briefly summarized. Different effective coating techniques, coating materials, and additives have been summarized. The results are useful to produce the coating with optimized properties.

scholarly journals Investigation of the structure and performance of Li[Li0.13Ni0.305Mn0.565]O2 Li-rich cathode materials derived from eco-friendly and simple coating techniques

RSC Advances ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 3166-3174 ◽  
Author(s):  
Xiangnan Li ◽  
Zhaoxia Cao ◽  
Hongyu Dong ◽  
Zhenpu Shi ◽  
Huishuang Zhang ◽  
...  
Keyword(s):  
Cathode Materials ◽  
Coating Materials ◽  
Coating Layers ◽  
And Performance

Constructing uniform nanoceramic coating layers is a well-known challenge in the field of coating materials.

scholarly journals The Impact of Surface Treatment and Degree of Vacuum on the Interface and Mechanical Properties of Stainless Steel Clad Plate

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1489 ◽  
Author(s):  
Ying-ying Feng ◽  
Huan Yu ◽  
Zong-an Luo ◽  
Guang-ming Xie ◽  
R. Misra
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Surface Treatment ◽  
Bonding Strength ◽  
National Standard ◽  
Vacuum Degree ◽  
Composite Oxides ◽  
Interfacial Bonding Strength ◽  
Stainless Steel Clad Plate ◽  
The Impact

In this study, the impact of different surface treatment and degree of vacuum on the interface and mechanical properties of 304/Q345 stainless steel clad plate was investigated. The study indicated that more continuous or aggregated Al2O3 and Si-Mn composite oxides were formed at the interface after brush grinding. However, less inclusions such as Al2O3, MnS and Ca-Mg-Al-Si composite oxides were formed at the interface after pickling treatment. For the vacuum degrees of 10−2 Pa, 1 Pa and 105 Pa, the oxidation reaction became more intense with the decrease in vacuum degree. The interface inclusions were gradually changed from Al2O3 and Si-Mn complex oxides to oxide scale and MnCr2O4 spinel oxide. The interfacial bonding strength of stainless steel clad plate was improved with the increase in degree of vacuum. The bonding strength was 55 MPa at vacuum of 105 Pa, but it was 484 MPa at vacuum of 10−2 Pa, which is far greater than that of the national standard, and an excellent performance was obtained.

The thin-layer drying characteristics of sewage sludge by the appropriate foaming pretreatment

2014 ◽  
Vol 69 (9) ◽  
pp. 1859-1866 ◽  
Author(s):  
Hui-Ling Wang ◽  
Zhao-Hui Yang ◽  
Jing Huang ◽  
Li-Ke Wang ◽  
Cheng-Liu Gou ◽  
...  
Keyword(s):  
Sample Thickness ◽  
Coefficient Of Determination ◽  
Drying Rate ◽  
Drying Time ◽  
Drying Characteristics ◽  
Thin Layer Drying ◽  
Dewatered Sludge ◽  
Drying Curves ◽  
Sludge Drying ◽  
The Impact

As dewatered sludge is highly viscous and sticky, the combination of foaming pretreatment and drying process seems to be an alternative method to improve the drying performance of dewatered sludge. In this study, CaO addition followed by mechanical whipping was employed for foaming the dewatered sludge. It was found that the foams were stable and the diameters of bubbles mainly ranged from 0.1 to 0.3 mm. The drying experiments were carried out in a drying oven in the convective mode. The results indicated that foamed sludge at 0.70 g/cm3 had the best drying performance at each level of temperature, which could save 35–45% drying time to reach 20% moisture content compared with the non-foamed sludge. The drying rate of foamed sludge at 0.70 g/cm3 was improved with the increasing of drying temperature. The impact of sample thickness on drying rate was not obvious when the sample thickness increased from 2 to 8 mm. Different mathematical models were used for the simulation of foamed sludge drying curves. The Wang and Singh model represented the drying characteristics better than other models with coefficient of determination values over 0.99.

Effect of particle size, fiber content, and surface treatment on the mechanical properties of maple-reinforced LLDPE produced by rotational molding

2020 ◽  
pp. 096739112091660
Author(s):  
Fatima Ezzahra Hanana ◽  
Denis Rodrigue
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Surface Treatment ◽  
Tensile Modulus ◽  
Complete Characterization ◽  
Fiber Content ◽  
Wood Fibers ◽  
Interface Quality ◽  
Effect Of Particle Size ◽  
The Impact

In this work, composites based on linear low-density polyethylene and maple wood fibers with and without surface treatment with maleated polyethylene (MAPE) were prepared by dry blending, followed by rotomolding to study the effect of particle size, fiber content, and surface treatment. From the samples produced, a complete characterization of the morphological and mechanical properties was performed. The results obtained showed that MAPE surface treatment improved the fiber–matrix interface quality, which improved the homogeneity, the thermal stability, and the mechanical properties of the composites. The results showed that the effect of particle size was significant as the tensile modulus increased by 7%, 40%, and 73% for 125–250, 250–355, and 355–500 µm at 30 wt% of maple fibers. The tensile strength also increased by 114% at the same fiber loading (30 wt%) when the particle size increased from 125–250 µm to 355–500 μm. Finally, the impact strength with 355–500 µm particles was 52% higher than for 125–250 µm particles at 30 wt%

scholarly journals Does Surface Finishing Method Can Alter the Colour of Monolithic Zirconia Restoration?

2015 ◽  
Vol 19 (3) ◽  
pp. 128-131
Author(s):  
Ender Akan ◽  
Ibrahim Talha Meşe
Keyword(s):  
Surface Treatment ◽  
Surface Finishing ◽  
Treatment Methods ◽  
Colour Measurements ◽  
Before And After ◽  
Group A ◽  
Colour Changes ◽  
Monolithic Zirconia ◽  
Group B ◽  
Effect Of Surface

SummaryMonolithic zirconia restorations offer superior mechanic properties and improve indication of non-metallic restorations. Monolithic restorations eliminate bonding and chipping problems mostly seen in zirconia restorations. However, optical properties are insufficient. Colouring or staining is offer possibility to mask the opaque view of restoration. Polishing and glazing are also surface treatment methods for monolithic zirconia.In this study effect of surface treatment methods on final view of zirconia were evaluated. For this purpose 30 monolithic zirconia samples (inCoris TZI, Sirona, Bensheim, Germany) were prepared. The samples were divided into 3 groups: In group A (n=10), glazing was performed using Vita Glaze (Vita Zahnfabrik, Bad Saeckingen, Germany); In group B (n=10), polishing was performed by using Soflex polishing system (3M-ESPE, Neuss, Germany); in Group C (n=10), polishing and glazing were performed. Before and after the applied the surface treatment methods, colour measurements were performed with a spectrophotometer (Vita EasyShade Advanced, Vita Zahnfabrik, Bad Saeckingen, Germany). Data were analysed using paired sample t-test at the p≤0.05 level and one-way analysis of variance (ANOVA) combined with Tukey’s multiple comparison tests.In all groups there were alterations in colour values; however, ΔE< 3.7 and the colour changes were undetectable.

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