Research and application of atmospheric sintering technology in the experimental teaching of material science and Engineering
First, preface in undergraduate teaching of material science and engineering specialty, students begin to learn basic courses and specialized courses of materials science and Engineering Specialty in senior grade. In course teaching of materials science and engineering, the preparation process and preparation of composite materials in atmospheric pressure sintering process are introduced in the process of preparing materials. Atmospheric sintering is the main method for the preparation of metal ceramic composites and other types of composite materials. Pressureless sintering the raw material powder prepared by pressure molding process of the preform has a certain shape, and put into the high temperature sintering furnace for high temperature sintered samples sintered compact, so the high density of the sintered products obtained by pressureless sintering process. Therefore, the compactness of the sintered products made by the normal pressure sintering process is high, and the mechanical properties are high. Composite materials and functionally graded materials can be prepared by the normal pressure sintering process. Atmospheric pressure sintering process is slow, but the longer sintering time, higher sintering temperature, sintering bulk preparation of denser. Composite materials can be prepared by atmospheric pressure sintering process. The composites fabricated by atmospheric pressure sintering technology can achieve the advantage of net near size forming. The atmospheric pressure sintering process can produce complex shaped sintered products and components according to the engineering needs, so the atmospheric sintering process can be widely applied in the engineering field. In the teaching of the undergraduate course of material science and engineering, the technology of atmospheric sintering is described in the methods of material processing and material preparation. In addition, atmospheric pressure sintering technology can be used to prepare composite materials as an experimental teaching content, arranging students to carry out experiments, so that students can understand and understand the process of preparing composite materials by atmospheric pressure sintering technology. Therefore, the preparation of composite materials by normal pressure sintering technology is widely used in the teaching practice of material science and engineering. This paper describes the principle and application of pressureless sintering, and pressureless sintering collected about research and application in the teaching of experiment in materials science and engineering, and the future development trend of the atmospheric pressure sintering process and development direction of analysis and forecast.
Two, the principle and engineering application of atmospheric pressure sintering technology, atmospheric pressure sintering technology, first of all, the raw material powder is prepared by pressure molding technology, and the sample body with certain shape is prepared, and put into high temperature sintering furnace and sintered at high temperature to obtain compact sintered samples. The normal pressure sintering process is to produce dense sintered products in high temperature sintering furnace under certain atmosphere pressure during sintering without pressurizing the materials. The atmospheric sintering process is the most widely applied sintering method at present. The normal pressure sintering process includes atmospheric sintering process under atmospheric conditions and atmospheric sintering under some special gas atmosphere. Ordinary ceramic materials are generally sintered in the atmosphere of oxidation, and atmospheric sintering under atmospheric conditions is often used in the production of ceramics. For ceramic products that are difficult to be sintered in the air, such as light transmittance or non oxide, the common atmosphere sintering method is used. This method is the atmosphere required to form the gas in the furnace, so that the products are sintered in a specific atmosphere. This method can prevent the ceramic material from oxidizing at high temperature until it promotes the density of the products. The normal pressure sintering process belongs to the process of free sintering of the body under atmospheric pressure. The sintering temperature of atmospheric pressure is usually high when the material is sintered without external power. The high temperature sintering process is commonly used in the normal pressure sintering process, and the high temperature sintering furnace is only needed in the atmospheric sintering process, so the preparation process is simple. The sintering temperature of the normal pressure sintering process is high, and the more compact sintered products can be prepared. The process by pressureless sintering is the first powder material by pressure molding preform made the desired shape, the preform has a dense, and preform into high temperature sintering furnace for high-temperature sintering process in a sintering temperature under thermal insulation for a period of time to obtain sintering product high density. There are many kinds of materials which can be selected in the normal pressure sintering process, and the application surface is also wide. The sintered products and parts with various shapes can be prepared by atmospheric pressure sintering process. Therefore, atmospheric sintering technology has been widely studied and applied in the field of materials science and engineering.
The research and application of pressureless sintering, three normal sintering technology in experimental teaching of materials science and engineering is the first is the raw material powder prepared by pressure molding process of the preform has a certain shape, and put into the high temperature sintering furnace for high temperature sintered samples sintered compact. The normal pressure sintering process is to produce dense sintered samples sintered in a high temperature sintering furnace at a certain atmosphere pressure without sintering during sintering process. The atmospheric sintering process is the most widely applied sintering method at present. The atmospheric pressure sintering technology has higher sintering temperature, longer sintering time and higher sintering efficiency, so that the sintering process can be realized. Therefore, the atmospheric sintering technology is mainly used to prepare cermet composites and other composite materials. In the teaching course of material science and engineering, the method of material processing and material preparation and synthesis tells about the normal pressure sintering process. The normal pressure sintering process is the same as the powder metallurgy technology, which is the preparation technology of the material. The normal pressure sintering process is also a hot processing technology. The atmospheric sintering process is the first one to make the material powder through pressure.