A sound-absorbing and noise-reducing porous ceramic used in substations

Abstract

The invention discloses a sound-absorbing and noise-reducing porous ceramic used in substations. Its preparation includes the following steps: S1: mixing an adhesive A, albite and commercial alumina to obtain a mixed powder a; S2: mixing the mixed powder a Add deionized water to mix, add dispersant and gelling agent B to the slurry, and ball mill at 250 rpm for 3~5h to obtain slurry b; S3: ball mill slurry b for 6~12h, then add foaming agent C, ball milling for 20-30 minutes, heating in a water bath at 80°C for 8-12 minutes, and pouring into a mold; S4: drying at room temperature for 4-6 hours, demoulding, and drying in an oven at 70°C for 5-8 hours to obtain green embryos; S5 : Heat up to 200°C at a speed of 3°C / min, keep warm for 30~40min, then raise the temperature to 1350~1450°C at a speed of 3~4°C / min, keep warm for 2~4min, then cool to room temperature with the furnace.

Description

technical field [0001] The invention relates to the technical field of functional ceramic materials, in particular to a sound-absorbing and noise-reducing porous ceramic for substations. Background technique [0002] Noise pollution has become a contemporary worldwide problem, and it is listed as the top three pollutions in the world together with water pollution and air pollution. , The aging of the mechanical structure will affect the accuracy and service life of the equipment and instruments. With the rapid development of industry and transportation, noise pollution is becoming more and more serious, especially in densely populated and economically developed large and medium cities, especially in the surrounding areas on both sides of expressways and railways, which has become a hot issue in the process of environmental governance. . The survey found that the residents living next to the highway, myocardial infarction rate increased by about 30%. [0003] Substations a...

AI Technical Summary

Problems solved by technology

But the copolymer of gelling agent isobutylene and maleic anhydride, and polyacrylic acid ammonium or tetramethylammonium hydroxide, all have certain toxicity, are not suitable for large-scale popularization; In the article "Research on Plant Gum and Performance", plant glue is used as gel, which has environmental protection effect, but expensive raw materials such as Boluo stone grains, Panyu black mud, Meizhou stone powder are used, which are not suitable for large-scale application; the application number is CN201110370562 The invention patent of .1 discloses a ceramic material with sound-absorbing and plant-cultivating functions and its preparation method. The sound-absorbing ceramic material has a certain refractoriness and sound-absorbing coefficient, but a large amount of organic or even toxic additives are used in the raw materials. During the preparation process, it will not only cause air pollution, but also the prepared porous sound-absorbing ceramics have low compressive strength and low sound-absorbing coefficient in the low-frequency region, which cannot meet the sound-absorbing requirements of substations; the invention patent with application number CN201910774304.6 discloses a A variety of low-cost ecological ceramic materials with sound-absorbing structures and their preparation methods use minerals as raw materials to develop a low-cost porous sound-absorbing ceramic sound-absorbing material, but the sound-absorbing material has a low sound-absorbing effect in the low-frequency region It is not ideal. The samples obtained in Examples 1, 2, and 3 have a maximum sound absorption coefficient of only 0.13 at 125 Hz, and the average sound absorption coefficient in the range of 100-150 Hz is also less than 0.12, which is not suitable for substations. Effectively block noise in low frequency bands

Images