Composite ceramic powder, flow guide nozzle and preparation method of composite ceramic powder

Abstract

The invention discloses composite ceramic powder, a flow guide nozzle, a preparation method of the composite ceramic powder. The method comprises the following steps: S1, preparing composite ceramic powder by taking ZrO2+HfO2 as a substrate, wherein the composite ceramic powder is prepared from the following components in percentage by weight: 92 to 96 percent of ZrO2+HfO2, 2 to 6 percent of Y2O3+CeO2, and 1 to 3 percent of SiO2+TiO2+Fe2O3+Al2O3+CaO+MgO; S2, mixing the composite ceramic powder, deionized water and a dispersing agent in a mass ratio of 1 to (1 to 2) to (0.001 to 0.002), and performing ball milling to obtain a sizing agent; S3, adding a bonding agent into the sizing agent, and performing ball milling continually; S4, performing spray granulation on the sizing agent preparedin step S3 to obtain composite ceramic finished powder. By adopting the prepared flow guide nozzle in a gas atomization powder preparing test, the zirconia-like matter content of the finished powder is lowered by up to 80 percent compared with the domestic products of the same kind.

Description

Technical field [0001] The invention relates to the technical field of materials, and more specifically to a composite ceramic powder, a flow guide nozzle and a preparation method thereof. Background technique [0002] In the process of metal smelting and atomization, the molten steel is poured from the crucible, passed through the tundish, the flow nozzle, and poured into the mold to be condensed into an ingot, or the molten steel is poured by a high-speed medium (gas or liquid) under the flow nozzle. Atomized into powder. Y 2 O 3 Stable ZrO 2 (YSZ) ceramic materials are widely used in the preparation of high temperature resistant devices such as flow guide nozzles due to their high thermal expansion coefficient, low thermal conductivity, and good thermal stability. [0003] Powder superalloy refers to the use of powder metallurgy to prepare superalloys, which are mainly used to manufacture hot end parts of aero-engine discs and shafts. The characteristic of the powder metallurg...

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Problems solved by technology

At present, domestically produced zirconia diversion nozzles have high sintering density and good erosion resistance, but poor thermal shock resistance, and are prone to thermal cracking when cooling after pouring, and the formed zirconia inclusions are mixed into the powder; zirconia produced abroad The diversion nozzle adopts a relatively loose structure, which is beneficial to improve the thermal shock resistance, but the inner wall of the diversion nozzle with a loose structure is easy to peel off under the erosion of molten steel, and it is also easy to be mixed with zirconia inclusions.

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