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A kind of method for preparing silicon vanadium nitride
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A technology of vanadium silicon nitride and vanadium source, applied in the field of preparing vanadium silicon nitride, can solve the problems of high production cost, high residual oxygen content, incomplete reaction, etc., and achieves short production time, good alloying effect, and equipment requirements. low effect
Active Publication Date: 2020-09-11
UNIV OF SCI & TECH BEIJING
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Chinese patent ZL201110000948.3 discloses a production method of ferrosilicon nitride. The raw material is vanadium oxide or ferrovanadium; vanadium oxide and ferrosilicon are calcined together to obtain ferrosilicon nitride products, but there is insufficient nitrogen enrichment and the reaction is not complete. , high residual oxygen content and other problems; ferrosilicon reacts with ferrosilicon to improve product quality, but the production cost is too high
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Embodiment 1
[0036] (1) take by weighing vanadium pentoxide 20g, silicon dioxide 0.5g, carbon black 5.4g, mix and briquette;
[0037] (2) Put the pressed sample in step (1) into a high-temperature furnace, heat to 1400° C. at a high temperature under a nitrogen atmosphere, and keep the temperature for 5 hours; after the reaction is completed, the product silicon vanadium nitride is obtained.
[0038] The test results show that the vanadium content in the product is 76.1%, the silicon content is 1.4%, and the nitrogen content is 17.6%.
Embodiment 2
[0040] (1) take by weighing vanadium pentoxide 20g, silicon dioxide 3g, carbon black 6.3g, mix and briquette;
[0041] (2) Put the materials in step (1) into a high-temperature furnace, heat to 1500° C. at a high temperature in a nitrogen atmosphere, and keep the temperature for 4 hours; after the reaction is completed, the product silicon vanadium nitride is obtained.
[0042] The test results show that the vanadium content in the product is 67.3%, the silicon content is 8.2%, and the nitrogen content is 20.8%.
[0043] figure 1 It is the XRD pattern of the vanadium silicon nitride product obtained in Example 2. As can be seen from the figure, the main components of the product are VN and Si. 3 N 4 , silicon to Si 3 N 4 Exist in the form of nitrogen, which greatly increases the nitrogen content of the product.
Embodiment 3
[0045] (1) take by weighing vanadium pentoxide 20g, silicon dioxide 4g, carbon black 6.8g, mix and briquette;
[0046] (2) Put the material in step (1) into a high-temperature furnace, heat to 1600° C. at a high temperature under a nitrogen atmosphere, and keep the temperature for 3 hours; after the reaction is completed, the product silicon vanadium nitride is obtained.
[0047] The test results show that the vanadium content in the product is 64.3%, the silicon content is 10.6%, and the nitrogen content is 22.6%.
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Abstract
The invention provides a method for preparing silicon vanadium nitride, and relates to the technical field of alloy smelting. The method has the advantages of low raw material cost, simple process route, short production time, and low equipment requirement, and can obtain silicon vanadium nitride products with higher nitrogen content and better alloying effects. The method comprises the followingsteps: S1, uniformly mixing a vanadium source, a silicon source and carbon powder for later use; and S2, calcining the mixed material obtained in S1 in a nitrogen atmosphere to obtain silicon vanadiumnitride. The technical solution provided by the invention is applicable to a preparation process of silicon nitride vanadium.
Description
【Technical field】 [0001] The invention relates to the technical field of alloy smelting, in particular to a method for preparing vanadium silicon nitride. 【Background technique】 [0002] In vanadium-containing microalloyed steel, nitrogen is a beneficial element. The strengthening effect of vanadium on steel is realized by the formation of vanadium carbonitride. Nitrogen addition in steel can promote the precipitation of vanadium, and the precipitated vanadium nitride can inhibit the precipitation of vanadium. The grain growth has the effect of precipitation strengthening and grain refinement strengthening. It can improve the strength and toughness of steel and optimize the performance of steel. Compared with adding ferrovanadium, adding nitrogen-vanadium alloy can save a lot of vanadium consumption and reduce the alloying cost. [0003] The commonly used method for increasing nitrogen in steel is adding nitride to molten steel during tapping, in which the theoretical mass...
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