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Magnesium oxide ceramic mold core and preparation method thereof

A technology of ceramic core and magnesium oxide, which is applied in the field of ceramic core, can solve the problems of low strength of magnesium oxide ceramic core and difficult core removal, etc., and achieve the effect of good dissolution and removal performance

Active Publication Date: 2019-08-02
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few researches involved at present, and a small amount of research work has been carried out. There are problems of low strength of magnesium oxide ceramic core and difficult core removal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Put the required raw materials into an oven and dry them for 2 hours at a temperature of 120°C;

[0024] (2) Take a certain amount of magnesium oxide and titanium dioxide, wherein 100 parts by weight of magnesium oxide powder (200 orders), 2 parts by weight of titanium dioxide powder;

[0025] (3) Pack the ball milling pot of the planetary ball mill into the weighed magnesia powder and titanium dioxide, and ball mill it for 2 hours at a rotating speed of 400r / min;

[0026] (4) Prepare 6 parts by weight of polyvinyl alcohol solution with a concentration of 5%, put the mixture into a mortar, add polyvinyl alcohol solution, and grind evenly;

[0027] (5) Put the homogeneously ground mixture into the mold, hold the pressure for 120s under the pressure of 9MPa, and then demold and take out the green body.

[0028] (6) Put the pressed green body into a box furnace, and sinter at 1320° C. for half an hour according to the set sintering curve to obtain a core with a bendin...

Embodiment 2

[0030] (1) Put the required raw materials into an oven and dry them for 2 hours at a temperature of 120°C;

[0031] (2) Take a certain amount of magnesium oxide and titanium dioxide, wherein 105 parts by weight of magnesium oxide powder (200 orders), 5 parts by weight of titanium dioxide powder;

[0032] (3) Pack the ball milling pot of the planetary ball mill into the weighed magnesia powder and titanium dioxide, and ball mill it for 2 hours at a rotating speed of 400r / min;

[0033] (4) Prepare 6 parts by weight of polyvinyl alcohol solution with a concentration of 5%, put the mixture into a mortar, add polyvinyl alcohol solution, and grind evenly;

[0034] (5) Put the homogeneously ground mixture into the mold, hold the pressure for 120s under the pressure of 9MPa, and then demold and take out the green body.

[0035] (6) Put the pressed green body into a box furnace, and sinter at 1250° C. for half an hour according to the set sintering curve to obtain a core with a bendin...

Embodiment 3

[0037] (1) Put the required raw materials into an oven and dry them for 2 hours at a temperature of 120°C;

[0038] (2) Take a certain amount of magnesium oxide and titanium dioxide, wherein 105 parts by weight of magnesium oxide powder (200 mesh), 6 parts by weight of titanium dioxide powder;

[0039] (3) Pack the ball milling pot of the planetary ball mill into the weighed magnesia powder and titanium dioxide, and ball mill it for 2 hours at a rotating speed of 400r / min;

[0040] (4) Prepare 6 parts by weight of polyvinyl alcohol solution with a concentration of 5%, put the mixture into a mortar, add polyvinyl alcohol solution, and grind evenly;

[0041] (5) Put the homogeneously ground mixture into the mold, hold the pressure for 120s under the pressure of 9MPa, and then demold and take out the green body.

[0042] (6) Put the pressed green body into a box furnace, and sinter at 1500° C. for half an hour according to the set sintering curve to obtain a core with a bending ...

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Abstract

The invention discloses a magnesium oxide ceramic mold core. The magnesium oxide ceramic mold core is mainly prepared from 100 to 110 parts by weight of magnesium oxide and 2 to 10 parts by weight oftitanium dioxide. A preparation method of the magnesium oxide ceramic mold core comprises the steps of performing pressing formation on the magnesium oxide and the titanium dioxide and sintering to obtain the magnesium oxide ceramic mold core. Relative to the prior art, the magnesium oxide ceramic mold core has the following advantages: the titanium dioxide with better effect of promoting sintering serves as a mineralizer of the magnesium-based ceramic mold core, therefore, the mold core has high dissolving and removing property; in addition, the final sintering temperature and the titanium dioxide content can be adjusted according to the requirement on the property of the mold core in the actual use process, so that the property of the mold core is adjusted.

Description

technical field [0001] The invention relates to a magnesium oxide ceramic core and a preparation method thereof, belonging to the technical field of ceramic cores. Background technique [0002] With the continuous development of the manufacturing industry, the requirements for the reliability of castings are constantly increasing, and the design of castings is becoming more and more functional. The functions realized by combining multiple parts in the past are gradually realized by a single part, thus increasing the complexity of castings. When producing parts with complex shapes and special-shaped inner cavities, casting has advantages that other manufacturing processes do not have, and is even an inevitable choice. [0003] In recent years, various alloy steel castings have been more widely used, and some parts have complex inner cavity structures, which brings difficulties to casting process design and casting production. At present, ceramic core materials for superalloy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/04C04B35/622C04B35/63
CPCC04B35/04C04B35/622C04B35/6303C04B2235/3232
Inventor 董寅生周光玉潘正武
Owner SOUTHEAST UNIV