Method for in-situ synthesis of amorphous SiOC nanowire reinforced ceramic core

A ceramic core, in-situ synthesis technology, used in cores, casting molding equipment, casting molds, etc., can solve problems affecting the enhancement effect of ceramic cores, achieve excellent room temperature and high temperature performance, enhance high temperature strength and high temperature creep. The effect of changing performance and improving yield

Inactive Publication Date: 2018-02-16
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These will seriously affect its reinforcing effect on the ceramic core

Method used

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  • Method for in-situ synthesis of amorphous SiOC nanowire reinforced ceramic core
  • Method for in-situ synthesis of amorphous SiOC nanowire reinforced ceramic core
  • Method for in-situ synthesis of amorphous SiOC nanowire reinforced ceramic core

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Embodiment 1

[0023] In this embodiment, a method for in-situ synthesis of an amorphous SiOC nanowire reinforced ceramic core comprises the following steps:

[0024] a. Mix the selected ceramic powder and silicone resin powder by ball milling, control the ball milling time to 24h, and sieve after ball milling to obtain a uniform mixed powder; in the mixed powder, the ceramic powder is silicon dioxide and alumina mixed oxide, the content of the added silicone resin powder is 10wt% of the total weight of the mixed powder;

[0025] b. Compressing the mixed powder uniformly mixed in the step a to obtain a porous ceramic green body; controlling the molding pressure to 20MPa, and the holding time to 3min;

[0026] c. curing the porous ceramic green body obtained in the step b in an atmospheric environment to obtain a porous ceramic green body; controlling the curing temperature to 300° C., holding time for 4 hours, and heating rate to 3° C. / min;

[0027] d. Carry out sintering treatment to the p...

Embodiment 2

[0037] This embodiment is basically the same as Embodiment 1, especially in that:

[0038] In this embodiment, a method for in-situ synthesis of an amorphous SiOC nanowire reinforced ceramic core comprises the following steps:

[0039] a. Mix the selected ceramic powder and silicone resin powder by ball milling, control the ball milling time for 24 hours, and sieve after ball milling to obtain a uniform mixed powder; in the mixed powder, the ceramic powder is silicon dioxide, and the added The silicone resin powder content is 15wt% of the total weight of the mixed powder;

[0040] b. This step is the same as in Embodiment 1;

[0041] c. This step is the same as in Embodiment 1;

[0042] d. This step is the same as in Embodiment 1.

[0043] In this embodiment, silicon resin is used as a binder and a precursor, and ceramic powder is used as a matrix to prepare a ceramic core material reinforced with SiOC nanowires. The precursor silicone resin used in this embodiment can be tr...

Embodiment 3

[0045] This embodiment is basically the same as the previous embodiment, and the special features are:

[0046] In this embodiment, a method for in-situ synthesis of an amorphous SiOC nanowire reinforced ceramic core comprises the following steps:

[0047] a. Mix the selected ceramic powder and silicone resin powder by ball milling, control the ball milling time for 24 hours, and sieve after ball milling to obtain a uniform mixed powder; in the mixed powder, the ceramic powder is silicon dioxide, and the added The silicone resin powder content is 10wt% of the total weight of the mixed powder;

[0048] b. This step is the same as in Embodiment 1;

[0049] c. This step is the same as in Embodiment 1;

[0050] d. Carry out sintering treatment to the porous ceramic preform solidified in the step c in a nitrogen inert atmosphere protection sintering furnace to obtain an amorphous SiOC nanowire reinforced ceramic core, and the control sintering system is:

[0051] First, heat up ...

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Abstract

The invention discloses a method for in-situ synthesis of an amorphous SiOC nanowire reinforced ceramic core. The method comprises the following steps: performing ball milling mixing on selected ceramic powder and silicon resin powder to obtain required mixed powder, performing compression molding on the obtained powder to obtain a porous ceramic biscuit, then performing curing treatment under anatmospheric environment, and performing sintering treatment on the cured sample in an atmosphere sintering furnace to finally obtain the amorphous SiOC nanowire reinforced ceramic core material, wherein a communicating nitrogen gas atmosphere is used for protection in the whole sintering process. According to the invention, the silicon resin is used as a binder and a precursor, and the ceramic powder is used as a substrate to prepare the SiOC nanowire reinforced ceramic core material; and the ceramic core prepared by the method has excellent room-temperature and high-temperature performance, and improves a finished-product yield of high-efficiency air-cooling blades. The process of the method is simple, the preparation costs are lower, and the prepared ceramic core has excellent performance. The preparation process of the method is simple, the operability is strong, the production period is short, and the costs are low.

Description

technical field [0001] The invention relates to a method for preparing a ceramic core, in particular to a method for strengthening a nanometer ceramic core, which is applied in the fields of investment casting, ceramic material preparation and polymer material research. Background technique [0002] Ceramic core materials are used to form the inner cavity structure of castings with complex structures, especially with the development of high-efficiency air-cooled blades such as double-walled blades, the key lies in the preparation of ceramic cores with excellent performance. As the core component, the ceramic core experiences a complex working environment. Firstly, it must withstand the high-speed impact of wax liquid during the mold shell manufacturing process, and secondly, it must withstand the continuous impact and immersion of molten high-temperature molten metal during the hollow casting molding process. These harsh environments require ceramic cores to have excellent r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/10C04B35/14C04B35/634C04B35/64B22C9/10B22C9/04
CPCC04B35/803B22C9/04B22C9/101C04B35/10C04B35/14C04B35/634C04B35/64C04B2235/483C04B2235/524C04B2235/6562C04B2235/6567C04B2235/658
Inventor 余建波杨治刚宋宗成邓康任忠鸣
Owner SHANGHAI UNIV
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