scholarly journals DEVELOPMENT OF LOW-MELTING GLASSCERAMIC BONDS FOR HIGH RESOURCE DIAMOND-ABRASIVE TOOLS

2021 ◽  
pp. 103-112
Author(s):  
Olena Fedorenko ◽  
Larysa Yashchenko ◽  
Dmytro Fedorenko ◽  
Volodymyr Fedorovych ◽  
Oleksandr Koniev
Keyword(s):  
Service Life ◽  
Pore Structure ◽  
Glass Ceramic ◽  
Open Structure ◽  
Working Layer ◽  
High Resource ◽  
Large Pore ◽  
Abrasive Tools ◽  
Bearing Layer ◽  
Diamond Abrasive

Research is aimed at creating high-resource diamond-abrasive tools with a large-pore structure of the working layer, the use of which reduces the occurrence of grinding defects when processing materials sensitive to overheating. The formation of an open structure of the working layer ensures effective chip removal, which excludes a decrease in the сutting ability of the tool due to contamination with grinding sludge and creates favorable conditions for intensifying the processing of materials when using high-speed cutting modes. As part of the research, low-melting glass-ceramic binders for diamond-abrasive tools have been developed, which make it possible to increase the tool service life  due to the prevention of diamond grains premature destruction and the creation of a large-pore open structure of the working layer. Using a set of calculated data about the main characteristics of glass compositions by factor planning means, the dependences «composition - properties» were determined and the area of optimal compositions of glass-ceramic bonds was established, which ensure sintering of a diamond-containing composite at a temperature of 550–650 °C. The efficiency of the use of alumino-silicate microspheres of technogenic origin as a structure-forming filler providing the formation of a large-pore structure is shown. The features of the chemical and phase composition of the technogenic spheres recovered from the fly ash of the Krivoy Rog TPP have been determined. It has been established that when the diamond-bearing layer of the tool is sintered in the shell of the ash spheres, crystalline new formations with high hardness (hercynite, mullite, maghemite, spinel) are formed. Using ash spheres and developed low-melting binders, which include up to 30 mass. % of glass waste, the laboratory samples of diamond-containing composites with open porosity of 45-50% were made. Studies of their microstructure and morphological features made it possible to determine the pore size (130-200 μm) and establish that during grinding, partial destruction of ash spheres occurs with the formation of additional cutting elements, which increases the tool cutting ability. The research results indicate the advisability of using the proposed approach for selection of the diamond-ceramic composite components and the modes of heat treatment of the diamond-bearing layer when creating a tool. This approach will significantly expand the possibilities of manufacturing large-pore diamond-abrasive tools with a high service life at minimal material costs and will improve the processing of parts made of difficult-to-machine materials.

scholarly journals Ceramic-matrix composite materials for the diamond abrasive tools manufacture

2017 ◽  
Vol 117 ◽  
pp. 212-224
Author(s):  
D. O. Fedorenko ◽  
V. A. Fedorovich ◽  
E. Yu. Fedorenko ◽  
K. B. Daineko
Keyword(s):  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Abrasive Tool ◽  
Simulation Experiments ◽  
High Resource ◽  
Ceramic Bond ◽  
Abrasive Tools ◽  
The Given ◽  
Bearing Layer ◽  
Diamond Abrasive

The results of the development of high-resource ceramic diamond abrasive tool, the design of which was carried out using computer simulation of processes, that accompanying its manufacturing and grinding in the mode of rational self-sharpening, is presented. According to the results of simulation experiments, the composition of the diamond-bearing layer was developed and the instrument with the use of a low-melting ceramic bond with the given properties were made.

Interaction of Composite Brazing Alloy Sn-Cu-Co-W with Diamond at Brazing of Diamond Abrasive Tools

2015 ◽  
Vol 799-800 ◽  
pp. 266-271 ◽  
Author(s):  
Evgeniy Georgiyevich Sokolov ◽  
Vladimir Petrovich Artemyev
Keyword(s):  
Metal Matrix ◽  
High Viscosity ◽  
Abrasive Tool ◽  
Entire Surface ◽  
Abrasive Tools ◽  
Vertical Sections ◽  
Bearing Layer ◽  
Diamond Abrasive

It was researched the interaction of composite brazing alloy Sn-Cu-Co-W with surface of diamond during formation of a diamond-bearing layer on abrasive tool. It was determined the influence of the composite brazing alloy components on wetting of diamond grains and their subsequent retention in metal matrix. The prototypes of stone-machining routers were manufactured with use of the designed composite brazing alloy. Thickness of obtained diamond containing coating is even over the entire surface is 2 mm. Due to the high viscosity of the composite brazing alloy it is well retained on the contoured surface of the substrate including the vertical sections.

Methanol‐to‐Olefins Reaction over Large‐Pore Zeolites: Impact of Pore Structure on Catalytic Performance

2021 ◽  
Author(s):  
Sungsik Park ◽  
Gakuji Sato ◽  
Ryota Osuga ◽  
Yong Wang ◽  
Yoshihiro Kubota ◽  
...  
Keyword(s):  
Pore Structure ◽  
Catalytic Performance ◽  
Large Pore ◽  
Large Pore Zeolites

Preparation Techniques and Property Evaluations of Highly Air Permeable Needle-Punched Geotextiles

2015 ◽  
Vol 749 ◽  
pp. 278-281
Author(s):  
Jia Horng Lin ◽  
Jing Chzi Hsieh ◽  
Jin Mao Chen ◽  
Wen Hao Hsing ◽  
Hsueh Jen Tan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Service Life ◽  
Mechanical Strength ◽  
Pore Structure ◽  
Test Results ◽  
Needle Punching ◽  
Pet Fibers ◽  
Environmental Requirements ◽  
Preparation Techniques

Geotextiles are made of polymers, and their conjunction with different processes and materials can provide geotextiles with desirable characteristics and functions, such as filtration, separation, and drainage, and thereby meets the environmental requirements. Chemical resistant and mechanical strong polymers, including polyester (PET) and polypropylene (PP), are thus used to prolong the service life of the products made by such materials. This study proposes highly air permeable geotextiles that are made with different thicknesses and various needle punching speeds, and the influences of these two variables over the pore structure and mechanical properties are then examined. PET fibers, PP fibers, and recycled Kevlar fibers are blended, followed by being needle punched with differing spaces and speeds to form geotextiles with various thicknesses and porosities. The textiles are then evaluated for their mechanical strength and porosity. The test results show that a thickness of 4.5 cm and 1.5 cm demonstrate an influence on the tensile strength of the geotextiles, which is ascribed to the webs that are incompletely needle punched. However, the excessive needle punching speed corresponding to a thickness of 0.2 cm results in a decrease in tensile strength, but there is also an increase in the porosity of the geotextiles.

Fabrication and Application of Gel Forming Ultrafine Diamond Abrasive Tools

2021 ◽  
Vol 10 (6) ◽  
pp. 063009
Author(s):  
Kaiping Feng ◽  
Binghai Lyu ◽  
Tianchen Zhao ◽  
Zhaozhong Zhou
Keyword(s):  
Ultrafine Diamond ◽  
Abrasive Tools ◽  
Diamond Abrasive

Recent advances of silicon wafer cutting technology for photovoltaic industry

2021 ◽  
Vol 118 (6) ◽  
pp. 616
Author(s):  
Changyong Chen ◽  
Meng Sun ◽  
Xiaoqing Chen ◽  
Yi Wang ◽  
Zhouhua Jiang ◽  
...  
Keyword(s):  
Service Life ◽  
Silicon Wafer ◽  
Production Efficiency ◽  
Surface Damage ◽  
Minimum Thickness ◽  
Large Size ◽  
Fine Wire ◽  
Wire Saw ◽  
Great Progress ◽  
Diamond Abrasive

Using ultra-fine wire saw to cut solar grade silicon wafer is a very precise technology. In the past 20 years, researchers have done a lot of research and made great progress. The cutting method of silicon rod has developed from single line cutting to multi line simultaneous cutting, which greatly improves the production efficiency and the yield of silicon rod. However, the problems of high cutting loss, low cutting efficiency, and large surface damage of silicon wafer need to be solved; The surface of wire saw line has developed from smooth surface to coated diamond abrasive, which greatly improves the service life of wire saw line; The method of coated diamond abrasive on the surface of wire saw line has developed from resin consolidation to electroplating consolidation, which greatly improves the service life of wire saw line it improves the firmness of the coating; The arrangement of wire saw wire has developed from single wire to multi wire stranding, which makes the wire saw wire can cut large-size silicon rod; The minimum thickness of silicon wafer that can be cut is about 100–140 µm according to the perspective of stress analysis, while the excetive value should be located by more research.

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