A deep-sea pressure-resistant alumina ceramic hollow float

Abstract

The invention discloses a deep-sea pressure resistant alumina ceramic hollow floating ball and a preparation method thereof. The preparation method comprises the following steps: 1,preparing reaction raw materials: uniformly ball-milling and mixing alumina powder with auxiliary agents for sintering, and dissolving acrylamide and a crosslinking agent N,N-methylene-bisacrylamide with stirring to obtain a premix solution; 2, rotating gel casting: mixing the ceramic powder with the premix solution with stirring, adding auxiliary agents, injecting the mixture into a spherical mold cavity after vacuum-degassing, rotating a mold, solidifying and shaping the mixture, and obtaining an alumina floating ball green body after drying; 3, binder removal and sintering: heating the dried alumina floating ball green body at a temperature of 300-800 DEG C to carry out binder removal, and carrying out sintering at a temperature of 1600-1800 DEG C to obtain a sintered body; 4, glazing: immersing the sintered body in glaze slip and carrying out glazing at a temperature of 500-800 DEG C. The floating ball has the following characteristics: the weight percentage of alumina is 94-99.9%, the outer diameter is 40-300 mm, the thickness of the spherical shell is 2-12 mm, the thickness deviation of the spherical shell is 0.1-2.5 mm, and the hydrostatic pressure the floating ball can resist is 150 MPa. The invention can be applied in deep sea of 11000 meters deep.

Description

technical field [0001] The invention relates to a deep-sea pressure-resistant alumina ceramic hollow floating ball. Background technique [0002] 71% of the Earth's area is covered by oceans, and the deep sea and deep sea areas with a depth greater than 200 meters account for 91% of the entire ocean area. The depth of the vast deep sea can reach tens of thousands of meters. The pressure is high, the water temperature is low, there is no light, and it is in darkness all year round. state, lack of oxygen, and scarce food, so it was once considered a barren land and a forbidden area for life. The harsh environment poses a challenge for human beings to enter the deep sea. It was not until the 1980s that developed countries were able to explore the deep sea. Therefore, the deep sea is the last virgin land on the earth, and it is also the focus of fierce competition for the "blue enclosure" movement of various countries in the new century. [0003] In the final analysis, the batt...

AI Technical Summary

Problems solved by technology

However, due to the low density and strength of the green body during rotary grouting, and due to the difference in material density, there will be a composition gradient inside the spherical shell, and then internal stress will be generated during the sintering process, resulting in a decrease in strength

In addition, the shape of the obtained hollow ball can only be guaranteed to be roughly spherical, and the low degree of sphericity leads to a decrease in its compression resistance, so this hollow ball cannot be used as a deep-sea pressure-resistant floating ball