Development of aerogel additives for the foundry industry

Meyer, Eva; Milow, Barbara; Ratke, Lorenz

doi:10.1016/j.supflu.2015.06.018

Cited by 7 publications

(4 citation statements)

References 13 publications

(17 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…SiO 2 aerogels have many advantages, including low thermal conductivity, low density and large specific surface area [ 1 , 2 , 3 ]. They can be used for thermal insulation [ 4 , 5 ], oil-water separation [ 6 ], wastewater treatment [ 7 ], sound insulation [ 8 ] and catalysts [ 9 ]. However, the mechanical properties of SiO 2 aerogels are poor.…”

Section: Introductionmentioning

confidence: 99%

Polysiloxane Bonded Silica Aerogel with Enhanced Thermal Insulation and Strength

Wang

Tong

et al. 2021

Materials

View full text Add to dashboard Cite

In order to improve the mechanical properties of SiO2 aerogels, PHMS/VTES-SiO2 composite aerogels (P/V-SiO2) were prepared. Using vinyltriethoxysilane (VTES) as a coupling agent, the PHMS/VTES complex was prepared by conducting an addition reaction with polyhydromethylsiloxane (PHMS) and VTES and then reacting it with inorganic silica sol to prepare the organic–inorganic composite aerogels. The PHMS/VTES complex forms a coating structure on the aerogel particles, enhancing the network structure of the composite aerogels. The composite aerogels can maintain the high specific surface area and excellent thermal insulation properties, and they have better mechanical properties. We studied the reaction mechanism during preparation and discussed the effects of the organic components on the structure and properties of the composite aerogels. The composite aerogels we prepared have a thermal conductivity of 0.03773 W·m−1·K−1 at room temperature and a compressive strength of 1.87 MPa. The compressive strength is several times greater than that of inorganic SiO2 aerogels. The organic–inorganic composite aerogels have excellent comprehensive properties, which helps to expand the application fields of silicon-based aerogels.

show abstract

Section: Introductionmentioning

confidence: 99%

Polysiloxane Bonded Silica Aerogel with Enhanced Thermal Insulation and Strength

Wang

Tong

et al. 2021

Materials

View full text Add to dashboard Cite

show abstract

“…Of course, other additives can be added, such as when Wen et al (2015) used a curing agent hexamethylenetetramine, which helped the manufacturing of binder coated Al 2 O 3 sand for SLS application. Other material such, as aerogel, was tested by Ratke and Milow (2011);Milow and Ratke (2012) and Meyer et al (2015). The casting samples indicate a higher thermal stability and a greater gas permeability.…”

Section: Additivesmentioning

confidence: 99%

A review on additive manufacturing of sand molds by binder jetting and selective laser sintering

Néel

Mognol

Hascoët

2018

RPJ

View full text Add to dashboard Cite

Purpose The purpose of this paper is to analyze the current state of the art manufacturing techniques using sand molds for the casting industry by the means of additive manufacturing (AM). In particular, this review will cover two families of 3D printing in regards to sand mold fabrication. Design/methodology/approach This paper will discuss the sand casting manufacturing processes of AM by binder jetting (3D printing) and selective laser sintering. Scientific articles, patents and case studies are analyzed. Topics ranging from the technology types to the economic implications are covered. Findings The review investigates new factors and methods for mold design, looking at mechanical properties and cost analysis as influenced by material selection, thermal characteristics, topological optimization and manufacturing procedure. Findings in this study suggest that this topic lacks vigorous scientific research and that the case studies by manufacturers thus far are not useful. Research limitations/implications As demonstrated by the limited data from previous published studies, a more comprehensive and conclusive analysis is needed due to the lack of interest and resources regarding the AM of sand molds. Practical implications This study is a useful tool for any researchers with an interest in the field of AM of sand molds. Social implications Key perspectives are proposed. Originality/value This review highlights current gaps in this field. The review goes beyond the scientific articles by curating patents and professional case studies.

show abstract

“…In the past, organic and inorganic aerogels in the form of granules were used as an additive to improve the properties of sand cores and casted parts such as metal penetration, surface fineness and collapsibility [ 12 ]. Additionally, high temperature stable aerogels present in the sand cores could be able to absorb gases evolved during the decomposition of polymeric resins employed as sand grain binders [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, drying and curing of RF AeroSand was recommended at lower temperatures under vacuum instead of direct pyrolysis to avoid reduction in stability. Meyer et al [ 13 ] utilized silica-based aerogels in granular form as an additive and examined the sand core behavior and cast surface quality. They observed that aerogel additives exhibited high thermal stability compared to conventional additives and also enhanced the gas permeability.…”

Section: Introductionmentioning

confidence: 99%

Effect of Process Conditions on the Properties of Resorcinol-Formaldehyde Aerogel Microparticles Produced via Emulsion-Gelation Method

2021

Self Cite

View full text Add to dashboard Cite

Organic aerogels in the form of powder, microgranules and microsized particles receive considerable attention due to their easy fabrication, low process time and costs compared to their monolithic form. Here, we developed resorcinol-formaldehyde (RF) aerogel microparticles by using an emulsion-gelation method. The main objective of this study is to investigate the influence of curing time, stirring rate, RF sol:oil ratio and initial pH of the sol in order to control the size and properties of the microparticles produced. The emulsion-gelation of RF sol prepared with sodium carbonate catalyst in an oil phase at 60 °C was explored. RF microparticles were washed with ethanol to remove the oil phase followed by supercritical and ambient pressure drying. The properties of the dried RF microparticles were analyzed using FT-IR, N2 adsorption isotherm, gas pycnometry, wide angle X-ray scattering and scanning electron microscope. RF microparticles with high surface area up to 543 m2/g and large pore volume of 1.75 cm3/g with particle sizes ranging from 50–425 µm were obtained.

show abstract

Development of aerogel additives for the foundry industry

Cited by 7 publications

References 13 publications

Polysiloxane Bonded Silica Aerogel with Enhanced Thermal Insulation and Strength

Polysiloxane Bonded Silica Aerogel with Enhanced Thermal Insulation and Strength

A review on additive manufacturing of sand molds by binder jetting and selective laser sintering

Effect of Process Conditions on the Properties of Resorcinol-Formaldehyde Aerogel Microparticles Produced via Emulsion-Gelation Method

Contact Info

Product

Resources

About