The results show that the interfacial tension between the two phases of AI2O3 and Fe is reduced after the addition of Na2B47, which leads to the incomplete separation and wettability of the two phases of AI2Q3 and Fe under centrifugal force. As a result, the compressive shear strength of the ceramic liner is significantly improved.
1 Introduction Centrifugal SHS ceramic-lined composite steel pipe (hereinafter referred to as ceramic liner) has excellent wear resistance, corrosion resistance and heat resistance. It is found in petroleum, chemical, paper, textile, metallurgy, mining, transportation, machinery and other sectors. Broad application prospects.
The ability of the ceramic liner to withstand mechanical shock and thermal shock is closely related to the bond strength between the ceramic layer and the steel tube matrix (iron-containing layer). Therefore, the shear strength of the ceramic liner is an important indicator to measure its quality. In this paper, the effect of Na2B7 additive on the compressive shear strength of ceramic liner was studied, and the influence mechanism was theoretically analyzed.
2 Experimental method The research of this experiment is based on the following reaction: the centrifugal force used in the experiment is 200g (g is the gravity coefficient). The steel pipe used for the experiment is a seamless steel pipe (material is No. 20 steel), and the size specification is Yl0mmX mm. As shown in Table 1, A1 and Fe23 are industrially pure, and Na2B47 is chemically pure.
Table 1 Aluminothermic Formulation Sample No. According to the method of Oda's original repair, the Shimadan Universal Material Testing Machine (G intensity generation, such groups are arranged in the direction of non-parallel surfaces, thereby reducing the energy difference between the surface and the inside. Therefore 2 After adding an appropriate amount of Na2B47 to the 3 and 4 samples, B3+ ions will play an important role. According to the principle of minimum energy, B3+ ions will rapidly accumulate at the interface between Al23 and Fe to form positive adsorption, which significantly reduces surface tension. Beijing: Beijing University of Science and Technology, 1996 The first Sino-Russian bilateral self-propagating high-temperature synthesis (SHS) academic conference was held in Beijing in order to further enter the cooperation between China and Russia in the field of self-propagating high-temperature synthesis, promote exchanges, and promote the development of SHS technology. The director of the Institute of Dynamics and Materials Science (ISMAN), the inventor of self-propagating technology, Academician Merzhanov, proposed to hold the first Sino-Russian bilateral SHS meeting in China. The Beijing University of Science and Technology and 1SMAN specifically organized the meeting and got China. Funded by the National Natural Science Foundation of China and the 863 New Materials Expert Committee, this academic conference will be held in the north from September 21st to 24th. Held in Beijing, the theme of the conference was “SHS Technology for the New Millenniumâ€.
Professor Xu Jinwei, Vice President of Beijing University of Science and Technology attended the opening ceremony and delivered a welcome speech on behalf of the school, and wished the meeting a complete success. Dr. Sytschev, Deputy Director of ISMAN, read a congratulatory letter from Academician Merzhanov. Professor Shi Likai and Professor Wang*, the chief scientists of the 863 New Materials Expert Committee, attended the opening ceremony. Professor Ge Changchun and Professor Rogachev of the two chairmen of the meeting introduced the preparation and organization of the meeting, and explained the significance and academic tasks of the meeting.
The conference exchanged 34 papers, covering the latest research results of SHS theoretical research, gas-solid system SHS, SHS composite materials and SHS products and industrialization. The 34 delegates came from China, Russia, Belarus and Armenia. The Chinese representatives included both the SHS Research 863 Program and the National Natural Science Foundation project, as well as young scholars from western universities and research institutes. The foreign representatives are from important research institutes in various countries and represent the highest level of SHS research in their respective countries. Chinese and foreign scholars have conducted full discussions and exchanges. Chinese scholars have learned about Russia's pioneering work in the field of theory and experimentation in the field of SHES. Russian scholars have greatly appreciated the achievements of Chinese counterparts in SHS industrialization. While conducting academic exchanges, the two sides also held talks on further strengthening cooperation.
Both representatives spoke highly of the results achieved at this meeting. Professor Ge Changchun, the Chinese president, expressed his gratitude to the Russian experts for their high-quality academic reports. He also hoped that researchers in the field of SHS in China would seriously study these theories and guide future research and production. Russian President Rogachev spoke highly of the organization of this meeting. He also hoped that Russian experts will seriously study the experience of Chinese industrialization and hope that China and Russia will further strengthen cooperation in the future and promote the use of SHS technology in the national economy.
The meeting discussed the development trend of SHS technology for the new millennium, promoted cooperation and exchanges between the two parties, and promoted the development of SHS technology. (Wu Anhua, Special Ceramic Powder Metallurgy Research Laboratory, University of Science and Technology Beijing)
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