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Dear Colleagues,

Understanding the thermophysical (heat capacity, thermal expansion, thermal conductivity, and diffusivity) and mechanical (mechanical strength, modulus of elasticity, and hardness) properties of materials (building, ceramic, composite, plastic, metallic, or noncrystalline) is useful for their practical applications. Therefore, it is crucial to study the relationship between these key properties and individual stages of the manufacturing process from an experimental or theoretical aspect. The description of the behavior of materials and products under nonstationary thermal boundary conditions in a broader temperature interval requires knowledge of the dilatometric characteristics of the materials, the dependence of the thermal conductivity or diffusivity on the temperature, and the temperature dependencies of heat capacity. The knowledge of thermophysical properties provides an opportunity for optimization of the thermal processing of materials and the thermal strain of products. Additionally, detailed knowledge of a given material and its properties provides the opportunity to determine its specific practical applications. Many experimental methods exist in the field of the measurement of thermophysical and mechanical properties: differential thermal analysis, differential scanning calorimetry, thermogravimetry, thermodilatometry, calorimetry, steady-state methods, and transient methods.

It is my pleasure to invite you to submit a manuscript to this Special Issue of Materials. Full papers, short communications, and reviews are all welcome.

Dr. Anton Trník
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Related Special Issue

Published Papers (1 paper)

Research

16 pages, 2209 KiB

Open AccessArticle

Development of Accelerated Test Method to Evaluate the Long-Term Thermal Performance of Fumed-Silica Vacuum Insulation Panels Using Accelerated Conditions

by Minjung Bae, Sunsook Kim and Jaesik Kang

Materials 2023, 16(19), 6542; https://doi.org/10.3390/ma16196542 - 03 Oct 2023

Viewed by 656

Abstract

International standards for vacuum insulation panels (VIPs) include an accelerated test method and a minimum quality standard for evaluating their long-term thermal performance after 25 years. The accelerated test method consists of various tests according to the characteristics of the core material and requires six months (180 days) at minimum. Herein, we propose an accelerated method for determining the long-term thermal performance of fumed-silica VIPs by shortening the required time and simplifying the procedure. Highly accelerated conditions (80 °C and 70% Relative humidity (RH)) were set for the evaluation method, using the maximum temperature (80 °C) cited in international standards and compared with the accelerated test method under accelerated conditions (50 °C and 70% RH). The inner-pressure increase rate of the VIP samples after conditioning for approximately 70 days was similar to that after conditioning for 180 days under highly accelerated and accelerated conditions, respectively. In addition, the estimated long-term thermal conductivities of the fumed-silica VIP were derived as 0.0076 and 0.0054 W/m·K under highly accelerated and accelerated conditions, respectively. These accelerated methods can be used to produce fumed-silica VIPs with similar long-term thermal conductivities. Therefore, the accelerated test method for long-term thermal performance using the highly accelerated conditions can be evaluated using a test that involves conditioning the sample for approximately 70 days under 80 °C and 70% RH. Full article

(This article belongs to the Special Issue Thermophysical and Mechanical Properties of Materials)

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