scholarly journals Photo-chemically induced polycondensation of a pure phenolic resin for additive manufacturing

2022 ◽  
Author(s):  
Raffael Wolff ◽  
Katharina Ehrmann ◽  
Patrick Knaack ◽  
Konstanze Seidler ◽  
Christian Gorsche ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Phenolic Resin ◽  
Chemical Resistance ◽  
Synthetic Polymers ◽  
Flame Resistance ◽  
Chemically Induced ◽  
The World ◽  
Pure Phenolic Resin

Bakelite© or phenoplasts are considered the first synthetic polymers in the world. These resins, produced by polycondensation, have always been known for their chemical resistance, excellent flame resistance and thermal...

3D Technology – Additive Manufacturing Applications and Prospects (Vol. 24, No. 9, Full Issue)

2020 ◽  
Vol 24 (09) ◽  
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Environmental Impact ◽  
Real World ◽  
Vaccine Development ◽  
Health Screening ◽  
Wide Range ◽  
The World ◽  
Real World Applications ◽  
Manufacturing Applications

For the month of September 2020, APBN dives into the world of 3D printing and its wide range of real-world applications. Keeping our focus on the topic of the year, the COVID-19 pandemic, we explore the environmental impact of the global outbreak as well as gain insight to the top 5 vaccine platforms used in vaccine development. Discover more about technological advancements and how it is assisting innovation in geriatric health screening.

scholarly journals Selective Laser Melting of Crack-Free High Density M2 High Speed Steel Parts by Baseplate Preheating

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
Karolien Kempen ◽  
Bey Vrancken ◽  
Sam Buls ◽  
Lore Thijs ◽  
Jan Van Humbeeck ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
High Speed ◽  
Crack Formation ◽  
High Speed Steel ◽  
Thermal Gradients ◽  
Laser Melting ◽  
Mechanical And Physical Properties ◽  
The World ◽  
M2 High Speed Steel

Cracks and delamination, resulting from residual stresses, are a barrier in the world of additive manufacturing and selective laser melting (SLM) that prohibits the use of many metals in this field. By preheating the baseplate, thermal gradients are lowered and stresses can be reduced. In this work, some initial tests were performed with M2 high speed steel (HSS). The influence of preheating on density and mechanical and physical properties is investigated. The paper shows many promising results for the production of SLM parts in materials that are very sensitive to crack formation and delamination. When using a preheating of 200 °C, crack-free M2 HSS parts were produced with a relative density of 99.8%.

Effect of TBPF Microencapsulated Ammonium Polyphosphate on the Properties of Thermoplastic Polyurethane Elastomer

2020 ◽  
Vol 842 ◽  
pp. 16-21
Author(s):  
Wei Ying Gao
Keyword(s):  
Phenolic Resin ◽  
Thermoplastic Polyurethane ◽  
Ammonium Polyphosphate ◽  
Polyurethane Elastomer ◽  
Flame Resistance ◽  
Cone Calorimetry ◽  
Limiting Oxygen Index ◽  
Elongation At Break ◽  
Hard Shell ◽  
Thermoplastic Polyurethane Elastomer

In our previous work, ammonium polyphosphate (APP) microcapsule with the shell of boron modified phenolic resin (BPF) was prepared, recorded as BPFAPP. However, the compatibility and the flame retardancy of BPFAPP in thermoplastic polyurethane elastomer (TPU) are still not very good due to the brittle and hard shell wall. To improve the brittleness of microcapsules shell and the property reinforcements of APP in TPU, APP was encapsulated with the tung oil and boron modified phenolic resin (TBPF) in this paper, recorded as TBPFAPP. The property reinforcements of TBPFAPP in TPU were studied. The thermogravimetry, limiting oxygen index and cone calorimetry analysis showed that TPU/TBPFAPP composite had higher char yield and better flame resistance. The tensile strength and elongation at break showed that the mechanical properties were also significantly improved due to the introduction of α-Eleostearate.

scholarly journals The structure and properties of eucalyptus fiber/phenolic foam composites under N-β(aminoethyl)-γ-aminopropyl trimethoxy silane pretreatments

2017 ◽  
Vol 19 (4) ◽  
pp. 116-121 ◽  
Author(s):  
Yufeng Ma ◽  
Chunpeng Wang ◽  
Fuxiang Chu
Keyword(s):  
Mechanical Properties ◽  
Phenolic Resin ◽  
Fiber Composite ◽  
Fiber Surface ◽  
Comprehensive Analysis ◽  
Structure And Properties ◽  
Flame Resistance ◽  
Interfacial Compatibility ◽  
Limited Oxygen ◽  
Trimethoxy Silane

Abstract Eucalyptus fibers were modified with N-β(aminoethyl)-γ-aminopropyl trimethoxy silane to research the fiber surface’s changes and the influence of the treatment on the mechanical properties, flame resistance, thermal conductivity and microstructure of eucalyptus fiber composite phenolic foams (EFCPFs). The results showed that the partial of hemicelluloses, waxes, lignin and impurities from the fiber surface were dissolved and removed. Compared with untreated EFCPFs, the mechanical properties of treated EFCPFs were increased dramatically; The size of cells was smaller and the distribution was more uniform; The thermal conductivities were basically reduced; Especially the ratio of mass loss decreased obviously. However limited oxygen indexs (LOIs) reduced. And the mechanical properties and LOIs of EFCPFs were basically decreased with the increase of eucalyptus fibers. By comprehensive analysis, the results showed that the interfacial compatibility has been significantly improved between eucalyptus fibers and phenolic resin. And the suitable dosage of eucalyptus fibers was about 5%.

scholarly journals Synergistic Effects of Aluminum Diethylphosphinate and Melamine on Improving the Flame Retardancy of Phenolic Resin

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 158 ◽  
Author(s):  
Ru Zhou ◽  
Wenjuan Li ◽  
Jingjing Mu ◽  
Yanming Ding ◽  
Juncheng Jiang
Keyword(s):  
Heat Release ◽  
Flame Retardancy ◽  
Phenolic Resin ◽  
Residual Carbon ◽  
Content Increase ◽  
Resin System ◽  
Total Heat Release ◽  
Residual Carbon Content ◽  
Pure Phenolic Resin ◽  
Carbon Content Increase

A series of novel flame retardants (aluminum diethylphosphinate and melamine) were used to improve the fire performance of phenolic resin. Fourier transform infrared spectroscopy (FTIR) was used to characterize the modification results. Thermo-gravimetric analysis (TGA) was used to study the thermal decomposition of phenolic resin system, and the flame retardancy of phenolic resin system was tested by vertical combustion test (UL-94) and limiting oxygen index (LOI). The combustion properties of modified phenolic resin were further tested with a cone calorimeter(CCT). Finally, the structure of carbon residue layer was measured by scanning electron microscopy (SEM). The results show that with the introduction of 10 wt % aluminum diethylphosphinate in phenolic resin, the LOI reaches 33.1%, residual carbon content increase to 55%. The heat release rate (HRR) decreased to 245.6 kW/m2, and the total heat release (THR) decreased to 58.6 MJ/m2. By adding 10 wt % aluminum diethylphosphinate and 3 wt % melamine, the flame retardancy of the modified resin can pass UL-94 V-0 flame retardant grade, LOI reaches 34.6%, residual carbon content increase to 59.5%. The HRR decreases to 196.2 kW/m2 at 196 s, relatively pure phenolic resin decreased by 35.5%, and THR decreased to 51 MJ/m2. Compared with pure phenolic resin, the heat release rate and total heat release of modified phenolic resin decreased significantly. This suggests that aluminum diethylphosphinate and melamine play a nitrogen-phosphorus synergistic effect in the phenolic resin, which improves the thermal stability and flame retardancy of the phenolic resin.

scholarly journals Potential and Scope of Additive Manufacturing in Aerospace Industry with Reference to India

2019 ◽  
Vol 8 (6S4) ◽  
pp. 1085-1089
Keyword(s):  
Additive Manufacturing ◽  
Labour Force ◽  
Aerospace Industry ◽  
Current Method ◽  
Spare Parts ◽  
Manufacturing Method ◽  
The World ◽  
Cost Of Production ◽  
Production Requirement ◽  
Traditional Manufacturing

Aerospace industry is one of the fastest growing industries in the world. Especially in India, it is estimated to grow in exponential rate owing to the rapid globalization and the fact that India is one of the world centres for tourism and trade. This exponential growth in the field of aerospace industry puts more demand on manufacturing and design of aircraft and its components. Unfortunately, the tradition method on spare parts production for aerospace industry cannot supply the growing demand to its fullest because it is time consuming and the cost of production is very high. Additive manufacturing, being one of the most revolutionary methods of is an appropriate substitute for the traditional manufacturing process in the aerospace industry as mass production becomes cheaper and save much of time. It also provides the flexibility to change the design and manufacturing method of any particular component with most ease at any stage from design to production. Additive manufacturing displays unarguable traits compared to traditional manufacturing in material saving, cost of production, requirement of skilled labour force and time consumption, especially in aerospace industry. However, there is not one single method of designing or producing the required component and this paper intends to classify and discuss each method in details and in comparison with each other. Few methods that are discussed in this paper include EBM, SLM, MD and LMD. In spite of the overwhelming advantage the technology has over the current method, it still faces few challenges to be fully implemented in floor level which is also focused in this paper in particular to India.

Current achievements in 3D bioprinting technology of chitosan and its hybrids

2021 ◽  
Author(s):  
Shadpour Mallakpour ◽  
Fariba Sirous ◽  
Chaudhery Mustansar Hussain
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Three Dimensional ◽  
3D Bioprinting ◽  
Printing Technology ◽  
3D Printing Technology ◽  
The World

In recent years, additive manufacturing, or in other words three-dimensional (3D) printing technology has rapidly become one of the hot topics in the world. Among the vast majority of materials,...

Unsettled Issues in Additive Manufacturing and Improved Sustainability in the Mobility Industry

2021 ◽  
Author(s):  
Kevin Slattery ◽  
◽  
Eliana Fu ◽  
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Value Chain ◽  
Sustainable Technology ◽  
Rolled Metal ◽  
Metal Parts ◽  
The World

Additive manufacturing (AM), also known as “3D printing,” is often touted as a sustainable technology, especially for metal components, since it produces either net or near-net shapes versus traditionally machined pieces from larger mill products. While traditional machining from mill products is often the case in aerospace, most of the metal parts used in the world are made from flat-rolled metal and are quite efficient in utilization. Additionally, some aspects of the AM value chain are often not accounted for when determining sustainability. Unsettled Issues in Additive Manufacturing and Improved Sustainability in the Mobility Industry uses a set of scenarios to compare the sustainability of parts made using additive and conventional technologies for both the present and future (2040) states of manufacturing.

scholarly journals Extrusion-Based Additive Manufacturing of Concrete Products: Revolutionizing and Remodeling the Construction Industry

2019 ◽  
Vol 3 (3) ◽  
pp. 88 ◽  
Author(s):  
Marco Valente ◽  
Abbas Sibai ◽  
Matteo Sambucci
Keyword(s):  
Additive Manufacturing ◽  
Construction Industry ◽  
Industrial Revolution ◽  
State Of The Art ◽  
Additive Technologies ◽  
Construction Sector ◽  
Fourth Industrial Revolution ◽  
The World ◽  
Hardened Properties ◽  
Traditional Manufacturing

Additive manufacturing is one of the main topics of the fourth industrial revolution; defined as Industry 4.0. This technology offers several advantages related to the construction and architectural sectors; such as economic; environmental; social; and engineering benefits. The usage of concrete in additive technologies allows the development of innovative applications and complexity design in the world of construction such as buildings; housing modules; bridges; and urban and domestic furniture elements. The aim of this review was to show in detail a general panoramic of extrusion-based additive processes in the construction sector; the main advantages of using additive manufacturing with the respect to traditional manufacturing; the fundamental requirements of 3D printable material (fresh and hardened properties), and state-of-the-art aesthetic and architectural projects with functional properties.

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