Nano silicon-titanium powder material and preparation method thereof

Abstract

The invention relates to a nano silicon-titanium powder material and a preparation method thereof. The preparation method comprises the following steps: S1, uniformly mixing raw materials, and feeding the raw materials into a plasma electric furnace in a protective gas atmosphere; and introducing hydrogen-containing protective gas into the furnace for heating, and carrying out high-temperature melting and mixing; s2, enabling the molten and mixed liquid flow to flow into a graphite cyclone separator, separating out a liquid silicon-containing raw material and sending the liquid silicon-containing raw material into a laser generator, directly radiating the molten raw material by generated laser, and enabling the silicon-containing raw material to quickly reach a boiling point and be evaporated and gasified into silicon steam by utilizing a laser radiation effect; and sucking the silicon steam into a cooler, rapidly cooling the silicon steam to 1120-1240 DEG C, mixing the silicon steam with other melt mixtures, and naturally cooling the mixture for subsequent treatment. By adopting the nano silicon-titanium powder material and the preparation method thereof, the bulk density of the obtained composite silicon powder is 0.9-1.5 g / cm < 3 >, and the composite silicon powder has the characteristics that the particle size span is large, the micro gradation is excellent, the dispersing performance is good, the water demand ratio is obviously reduced when the composite silicon powder is doped into concrete, the dry shrinkage rate of the concrete can be effectively reduced, and the like.

Description

technical field [0001] The invention belongs to the technical field of materials and relates to silicon powder improvement technology, in particular to a nano-silicon-titanium powder material and a manufacturing method thereof. Background technique [0002] As a combination of traditional materials and new material technology, nano-material modified concrete is a new direction for the development of the concrete industry in recent years. Nano-material modified concrete not only improves the strength and durability of the original cement-based concrete, but also has some special functions of nano-materials. Studies have shown that the addition of nano-materials is only 1% of the amount of Portland cement to improve the early strength. 30-40%. [0003] At present, the main factors restricting the large-scale use of nanomaterials are the complex raw material processing technology, the concentrated release of cement hydration heat, and the agglomeration caused by the high surfa...

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Problems solved by technology

At the same time, ordinary silica fume requires a large water ratio, resulting in poor workability of concrete. After adding silica fume, the concrete has high dry shrinkage rate and easy cracking, which also affects the key factors for its application in high-performance concrete, restricting the large amount of silica fume. use

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