Materials Science Forum Vol. 980

Abstract: In this paper, based on the theoretical study of tool wear and the systematic analysis of the main factors affecting the tool durability, four types of PVD and CVD-coated blades from three manufacturers were subjected to cutting tests using PCrNi3MoVA gun steel workpieces. The wear morphology, fatigue curves, and chip patterns of the tested blades were comparatively analyzed. The influence of the coating type on the tool durability was investigated using a scanning electron microscopy and energy dispersive spectroscopy. The results obtained strongly indicate that TiAlN coating deposited by the PVD technology has the best thermal stability, temperature oxidation resistance, and tool durability when cutting PCrNi3MoVA gun steel workpieces under semi-finishing conditions. The wear resistance of the other three types of blades was relatively lower due to less favorable coating compositions and structures. The study findings are instrumental in the substantiated selection of cutters for practical applications and provide a reference for the design optimization of indexable coated inserts.

Abstract: The preparation of tetragonal zirconia nanopowders by sol–gel method using zirconium oxychloride as raw material, ammonia water and sodium hydroxide solution as precipitant, and calcium oxide or magnesium oxide powders as stabilizing agents is described. After suction filtration, drying, and calcination, tetragonal zirconia nanopowders with different particle size and tetragonal phase content were obtained. The particle size and phase composition of the powders are characterized by using a laser particle size analyzer and an X-ray diffractometer, and the tetragonal phase content and grain size are calculated from the crystal plane formula and Scherrer formula. The analysis of the relationship between the tetragonal phase content and the particle size of the zirconia nanopowders stabilized by calcium oxide and magnesium oxide at room temperature reveals the inhibitory effect of the stabilizing agents on the growth of zirconia grains. The stabilized zirconia nanopowder is finer than unstabilized zirconia nanopowder, and the particle distribution is more uniform in the former. The stabilizing effect of calcium oxide is superior to that of magnesium oxide; the critical transformation size of the zirconia grains stabilized by calcium oxide is the largest, and that of unstabilized zirconia is the smallest. The critical transformation size of calcium oxide-stabilized, magnesium oxide-stabilized, and unstabilized zirconia nanopowders is 18–22.6 nm, 24–28 nm, and 26–33.6 nm, respectively. Under the same calcination condition, the calcium oxide-stabilized zirconia nanopowder retains the highest tetragonal phase content at room temperature.

Abstract: In this study, a magnesium oxide partially stabilized zirconia (Mg-PSZ) sample was prepared by granulation, molding, drying, and calcining. MgO was used as stabilizer, along with chemical-and electrofusion-made zirconium dioxide (ZrO₂) powder, as well as a different mixture of the two as the raw material. The effects of material reactivity on the sintering properties of the Mg-PSZ metering nozzle were studied by analyzing the physical properties and microscopic structure of the sample. The results show that, under the same sample preparation conditions, the electrofusion-made ZrO₂ had lower reactivity, resulting in a lower percentage of stable phase, loose adhesion among particles after sintering, more than 20% porosity, and poor antierosion and antiscouring performance. However, electrofusion-made ZrO₂ only had a shrinking percentage of 6%, leading to a higher sintering yield. However, compared with the electrofusion-made ZrO₂, chemical-made ZrO₂ had a higher reactivity, better sintering properties, more stable phase component, and approximately 75% less porosity. Chemical-made ZrO₂, however, had a shrinking percentage as high as 20%, causing serious sample cracking after sintering. Therefore, both types of ZrO₂ are not ideal as the only raw material for Mg-PSZ metering nozzles. Nonetheless, when a 1:1 mixture of the two types of ZrO₂ was used as the raw material, the calcined sample showed better property parameters in porosity and volume density, as well as compressive strength, satisfying the requirements for Mg–PSZ-based metering nozzles.

Abstract: Most of the yachts are comprised of fiberglass reinforced plastics composite materials. This material is expensive and difficult to deal with (It is difficult to burn, and not easy to destroy, more cannot be recycled), the internationally known as field-fill. People accumulation and landfill disposal the old takes up a lot of land resources. Therefore, it is necessary to develop a low cost, recyclable and environmentally friendly yacht to replace the current large number of fiberglass reinforced plastics yachts. The purpose of this study was to explore the advantages of the composite bamboo yacht material as a more cost-effective, sustainable alternative. Applying the theory of the deformation of laminated beam, this study tested a prediction model of the composite bamboo yacht material's the modulus of elasticity values. The prediction model accurately calculated the end product's the modulus of elasticity values according to the single bamboo board's the modulus of elasticity values and its assembling manner, without destroying the material's basic structure and integrity. In sum, the main physical and mechanical properties of the composite bamboo yacht material are obviously beyond regular fiberglass reinforced plastics yacht material. The transverse mechanical properties were obviously enhanced by using the advantage of unidirectional alkali free glass fiber plain cloth and improving the assembly manner. Only 10% of the current market cost at time of publication, a renewable, many environmental advantages, radically has enormous market potential to replace regular fiberglass reinforced plastics yacht material.

Abstract: A negative resist composition composed of an acrylic-copolymer-binder resin, a crosslinker, photoinitiators, some agents and solvents has been UV-cured and developed for OverCoat (OC)-Bridge of One Glass Solution (OGS) touch panel (TP) sensor, wherein acrylic-copolymer-binder resin as a key element consisting of N-Phenylmaleimide (N-Pm), Methacrylic acid (MA), Styrene (St) and Isobornyl methacrylate (iBMA) monomers, being designed and synthesized to control the acid value (90-110mgKOH/g), molecular weight (Mw:10,000-20,000) and approximate solubility parameter [10.67-11.05(cal/cm3)1/2]. Here,we demonstrate a OC photoresist applies between two ITO line-films by UV-curing process technology deveoled for OC-Bridge pattern with a kind of acrylic-copolymer-binder resin by ours. Acting as TP sensor, the OC patterns have adequate resistance to solvents, acids and alkalis, good thermal and humid stability, and with excellent transparency and insulation. This OC photoresist, coupled with the acrylic-copolymer-binder resins, provides an unprecedented approach to realize supporting high temperature and humidity OC-Bridge.

Abstract: The paper first introduces the concept of inherent strain and the theory and method of predicting welding deformation by the inherent strain finite element method. Studies have shown that the inherent strain exists in the weld and the near seam area, and it is also related to factors such as welding heat input and plate thickness. Through the use of large-scale finite element simulation software ANSYS, the inherent strain finite element prediction method is applied to the welding deformation of the outer gantry assembly material of forklift, which provides effective reference data for future welding work of forklift gantry materials.

Abstract: Silver has functional properties such as disinfection, sterilization, and anti-corrosion.The combination of silver and conventional ceramics by high-temperature silver plating can impart the functionality to ceramic products and increase the functionality of ceramic products.The traditional way of decorating ceramic products is mainly glazed decoration, which combines silver and ceramics, and its silver metallic luster can bring decorative effects to ceramic products. And it is produced by high-temperature silver plating, which saves costs in the production process compared to traditional silver plating.At the same time, compared with traditional ceramics, high-temperature silver-plated ceramics can take into account the properties of ceramics and can also play the role of disinfection, sterilization, anti-corrosion and other properties of silver. It is produced by high-temperature silver plating, which is more cost-effective than traditional silver plating in the production process. At the same time, compared with traditional ceramics, high-temperature silver-plated ceramics can achieve the disinfection and sterilization of silver in consideration of the properties of ceramics,anti-corrosion and other attributes, a reasonable combination of the two, fully demonstrate the functionality and decoration of both.

Abstract: The lead-free wood leafhopper is the iconic traditional ceramic art of the Jizhou kiln in the Song Dynasty of China. The traditional lead-free wood leafhopper is usually made of black glaze. The glaze is placed on the mulberry leaf and fired at a high temperature of about 1230 °C-1260 °C. And the veins are clear. Jizhou kiln was founded in the late Tang Dynasty. It flourished in the Five Dynasties and Northern Song Dynasty. It was the most prosperous in the Southern Song Dynasty. It began to decline in the late Yuan Dynasty and then stopped for more than 700 years. However, its unique artistic value has gradually be attracted the attention by the world. And it recovered in 1985 at last after unremitting efforts. The re-burning of the lead-free wood leafhopper has successfully opened the ceramic market of the lead-free wood leafhopper and made it occupy a certain position in the ceramic market. The price of lead-free wood leafhopper has remained high, and therefore ceramic producers are waiting for opportunities to produce on a large scale in order to achieve huge economic benefits. However, due to the great difficulty in the firing process of the lead-free wood leafhopper, the market has a phenomenon of low yield, high price, low consumer desire, and the use of chemical materials to fire products. The subject analyzed and solved these phenomena through a large number of experiments. Lead-free in this subject is a relatively broad definition, especially referring to the new type of lead-free wood leafhopper without contain heavy metals.

Abstract: Plasma is generally used for the doping of semiconductors. During plasma doping process, plasma interacts with the surface of semiconductor. As a result, defects are induced in the surface region. In this work, the surface morphology and roughness of silicon wafer caused by plasma treatment is studied by use of atom force microscope (AFM). It is found that, during the plasma process, each of the processing time of plasma, location of silicon wafer in plasma and the way of placement of silicon wafer has an influence on the surface morphology and roughness and the reason is discussed. The interaction between plasma and the surface of silicon wafer is qualitatively discussed.