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Preparation method for ceramic casting mold for single-crystal high-temperature alloy parts

A ceramic casting mold and superalloy technology, applied in the field of additive manufacturing, can solve the problems of easy hydration, difficulty in preparing calcium oxide water-based ceramic slurry, etc., and achieve the effects of weak interface reaction, shortening the preparation cycle, and simplifying the process flow

Inactive Publication Date: 2017-10-13
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the problem of easy hydration, it is difficult to prepare calcium oxide water-based ceramic slurry, which has not been widely used.

Method used

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  • Preparation method for ceramic casting mold for single-crystal high-temperature alloy parts

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1, design the ceramic mold;

[0030] According to the requirements of the casting process, the casting mold is determined to be a module composed of two turbine blade parts, with the tip facing down, and a top pouring casting structure. The spiral crystal selector is used for crystal selection. The main parameters of the spiral crystal selector are: the height of the seeding section 30mm, seeding section diameter 17mm, spiral channel diameter 5mm, helix angle 20°, screw diameter 14mm, initial mold wall thickness 7mm; use UG 3D modeling software to model ceramic molds for parts; use Procast The casting simulation software simulates and analyzes the stress, temperature field, and crystal growth of the ceramic mold under the conditions of 1550°C pouring temperature, 1550°C mold temperature, and 3-5mm / min drawing rate, and iterates the design of the ceramic mold according to the simulation results; Under the condition that the strength of the mold is satisfied, the met...

Embodiment 2

[0042] Step 1: Determine the basic parameters of the overall structure, gating system, crystal selection system, and mold wall thickness according to the requirements of the casting process; use 3D CAD modeling software to model the ceramic mold of the part; use Procast casting simulation software to calculate the pouring temperature, casting Under the conditions of molding temperature and drawing rate, the stress, temperature field and crystal growth of ceramic mold are simulated and analyzed, and the design iteration of ceramic mold is carried out according to the simulation results; finally, a ceramic mold structure with uniform directional solidification temperature field and less casting defects is obtained and design parameters, establish a three-dimensional model of the ceramic mold;

[0043] Step 2, uniformly mix the photosensitive resin and dispersant by mechanical stirring, gradually add ceramic powder and sintering aid during the stirring process, and finally use bal...

Embodiment 3

[0050] Step 1: Determine the basic parameters of the overall structure, gating system, crystal selection system, and mold wall thickness according to the requirements of the casting process; use 3D CAD modeling software to model the ceramic mold of the part; use Procast casting simulation software to calculate the pouring temperature, casting Under the conditions of molding temperature and drawing rate, the stress, temperature field and crystal growth of ceramic mold are simulated and analyzed, and the design iteration of ceramic mold is carried out according to the simulation results; finally, a ceramic mold structure with uniform directional solidification temperature field and less casting defects is obtained and design parameters, establish a three-dimensional model of the ceramic mold;

[0051] Step 2, uniformly mix the photosensitive resin and dispersant by mechanical stirring, gradually add ceramic powder and sintering aid during the stirring process, and finally use bal...

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Abstract

The invention discloses a preparation method for a ceramic casting mold for single-crystal high-temperature alloy parts. According to the preparation method, a novel photocuring rapid molding technology based on a face exposure method is adopted to achieve preparation of the ceramic casting mold for the single-crystal high-temperature alloy parts. Assembling of a mold core and a mold shell and preparation and assembling of a wax mold are not needed; the high-precision integral type ceramic casting mold which meets the requirement can be directly prepared; and the technological process is greatly simplified. A crystal sorting system and the casting mold are integrally formed; the problem that in the traditional investment casting process, the mixed crystal defect is generated due to foreign matter inclusion or the improper assembling position caused by assembling of the crystal sorting system or the part wax mold is avoided; and in addition, through design of the casting mold structure and the wall thickness, accurate control over the directional solidification process of a high-temperature alloy can be achieved, and casting defects can be reduced.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a method for preparing ceramic casting molds for single crystal superalloy parts. Background technique [0002] Superalloys are widely used materials for hot-end parts of energy and power equipment. Among them, single crystal superalloys are used to manufacture parts that work stably at high temperatures due to their excellent high-temperature performance. Single crystal superalloy parts with complex structure are generally manufactured by directional solidification investment casting process. The ceramic mold manufacturing process of investment casting includes the steps of core manufacturing, wax mold manufacturing, moulding, coating and shell making, wax melting, roasting, etc., involving pre-production preparations such as core metal mold preparation and wax mold metal mold preparation. Work. Due to factors such as the production preparation cycle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C9/22B33Y10/00
Inventor 鲁中良徐文梁杨强李涤尘
Owner XI AN JIAOTONG UNIV
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