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Method for preparing silicon oxide-based ceramic core for titanium and titanium alloy casting

A silicon oxide-based, ceramic core technology, which is applied in the field of titanium alloy precision casting processing, can solve the problems of difficult core removal, hydration, etc., achieve low cost and improve chemical inertness

Inactive Publication Date: 2014-04-02
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of zirconia in the above-mentioned core is relatively large, and zirconia is a stable compound, which is insoluble in acid-base solution. Therefore, it is difficult to remove the core of the core, and because the core contains a certain amount of calcium oxide, the core Also facing the problem of hydration during use

Method used

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  • Method for preparing silicon oxide-based ceramic core for titanium and titanium alloy casting
  • Method for preparing silicon oxide-based ceramic core for titanium and titanium alloy casting
  • Method for preparing silicon oxide-based ceramic core for titanium and titanium alloy casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The method for preparing a silicon oxide-based ceramic core for casting titanium and titanium alloys is characterized in that the steps of the method are:

[0020] Step 1. Preparation of silicon oxide core blank

[0021] 85kgSiO 2 , 7.5kg of paraffin wax, 6kg of beeswax and 1.5kg of oleic acid are mixed, then shaped and sintered. During the sintering process, the paraffin, beeswax and oleic acid are all volatilized, leaving only pure silica, so the pure silica core is obtained after sintering Blank;

[0022] Step 2, preparing ZrO on the surface of the silicon oxide core blank 2 or Y 2 o 3 The nano film, the preparation process is as follows:

[0023] ⑴Preparation of ZrO by sieving method 2 or Y 2 o 3 Powder, the particle size is controlled at 200-400 mesh, in ZrO 2 or Y 2 o 3 After adding adhesive to the powder and mixing, stir evenly to prepare a coating with a flow cup viscosity of 40S. The adhesive is silica sol, zirconium acetate or yttrium sol, and the a...

Embodiment 2

[0032] The method for preparing a silicon oxide-based ceramic core for casting titanium and titanium alloys is characterized in that the steps of the method are:

[0033] Step 1. Preparation of silicon oxide core blank

[0034] Mix 95kg CaO, 4kg paraffin, 0.5kg beeswax, and 0.5kg oleic acid, then shape and sinter. During the sintering process, the paraffin, beeswax and oleic acid are all volatilized, leaving only pure silicon oxide, so pure silicon oxide is obtained after sintering core blank;

[0035] Step 2, preparing ZrO on the surface of the silicon oxide core blank 2 or Y 2 o 3 The nano film, the preparation process is as follows:

[0036] ⑴Preparation of ZrO by sieving method 2 or Y 2 o 3 Powder, the particle size is controlled at 200-400 mesh, in ZrO 2 or Y 2 o 3 After adding adhesive to the powder and mixing, stir evenly to prepare a coating with a flow cup viscosity of 30S. The adhesive is silica sol, zirconium acetate or yttrium sol, and the amount of adhes...

Embodiment 3

[0045] The method for preparing a silicon oxide-based ceramic core for casting titanium and titanium alloys is characterized in that the steps of the method are:

[0046] Step 1. Preparation of silicon oxide core blank

[0047] Mix 90kg of CaO, 6kg of paraffin, 3.5kg of beeswax, and 0.5kg of oleic acid, then shape and sinter. During the sintering process, paraffin, beeswax and oleic acid are all volatilized, leaving only pure silicon oxide, so pure silicon oxide is obtained after sintering core blank;

[0048] Step 2, preparing ZrO on the surface of the silicon oxide core blank 2 or Y 2 o 3 The nano film, the preparation process is as follows:

[0049] ⑴Preparation of ZrO by sieving method 2 or Y 2 o 3 Powder, the particle size is controlled at 200-400 mesh, in ZrO 2 or Y 2 o 3 After adding adhesive to the powder and mixing, stir evenly to prepare a coating with a flow cup viscosity of 5S. The adhesive is silica sol, zirconium acetate or yttrium sol, and the amount o...

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Abstract

The invention relates to a method for preparing a silicon oxide-based ceramic core for titanium and titanium alloy casting. The method comprises steps of preparing a blank of the silicon oxide-based ceramic core, preparing a ZrO2 or Y2O3 coating on the surface of the blank of the silicon oxide-based ceramic core through a surface coating technology, and intensively sintering the ceramic core. The silicon oxide-based ceramic core prepared by the method can effectively overcome the defect that the zirconia or yttria-based ceramic core has high cost and is difficult to remove as well as the defect that conventional silicon oxide ceramic core cannot be used due to strong interfacial reaction in solidification of the titanium alloy.

Description

technical field [0001] The invention relates to a method for preparing a silicon oxide-based ceramic core for casting titanium and titanium alloys, belonging to the field of precision casting of titanium alloys. Background technique [0002] Usually the complex inner cavity molding of metal castings is mainly formed by using prefabricated ceramic cores, and try to remove them after pouring and solidification. The technological process is as follows: preparation of ceramic core, preparation of wax mold containing ceramic core, shell making, shell dewaxing and roasting, alloy casting, and core removal. With the rapid development of my country's aerospace vehicles and their engines, in order to achieve the goal of weight reduction, the demand for titanium alloy castings is becoming more and more extensive, and the shape and structure of the required titanium alloy castings are becoming more and more complex, especially the inner cavity The structure is becoming more and more co...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 南海黄东赵鹏李建崇魏战雷
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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