Papers by Keyword: Non-Metallic Materials

Abstract: Printed circuit boards (PCBs) are the typical and fundamental components of almost all electric and electronic equipments. The mechanical and physical treatment of PCBs generates a large amount of non-metallic materials and thus there is an urgent need to develop alternative treatment methods for them. In this study, the characteristics and environmental risk of non-metallic materials were analyzed. The current recycling methods were investigated as well. The results showed that their chemical components were distinct for the glass fiber/epoxy laminated boards and paper/phenolic laminated boards. The presence of bromine, chlorine, copper, chromium and lead would pose a threat to the environment during its recycling. The current recycling methods included landfill, preparing composites and building materials, pyrolysis and combustion. These methods had their own distinct advantages and disadvantages. The comparative analysis indicated that preparing composites may be an alternative recycling method. Molten salt oxidation (MSO) technology is prospective and need be further studied.

Abstract: Industry development Planning for Energy Saving and Environmental Protection in Twelfth Five Year has proposed that market share for efficient energy-saving technology and equipment will be raised from less than 5% at present to about 30% in 2015, and the output value will reach 500 billion yuan. The 18th National Congress of the CPC has proposed to put ecological civilization construction in a prominent position to build a beautiful China. State Council of China issued the Prevention Action Plan for air Pollution in 2013. It is a tough task and a long way to go. How can we realize the planning goal Many non-metallic mineral materials have good applications in energy saving and environment protection. China is abundant in various non-metallic mineral resources. Therefore, development for non-metallic mineral resources for energy saving and environmental protection has good prospects. The paper gives an overview of the mechanism of several main non-metallic materials for energy-saving and environment-protection.

Abstract: There are different documents containing fatigue crack propagation limit or design curves and rules for the prediction of crack growth. The research work aimed to characterise the fatigue crack propagation resistance of different materials using limit curves and determination of limit curves under different loading conditions, based on statistical analysis of test results and the Paris-Erdogan law. With the help of the characteristic values of threshold stress intensity factor range (
Kth), two constants of Paris-Erdogan law (C and n), fatigue fracture toughness (
Kfc) or fracture toughness (KIc) two reliable method can be proposed. The limit curves calculated by both methods represent a compromise of rational risk (not the most disadvantageous case is considered) and striving for safety (uncertainty is known).