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Magnesium oxide ceramic core with good dissolution collapsibility and preparation method thereof

A technology of ceramic core and magnesium oxide, which is applied in the direction of ceramic products, cores, casting molding equipment, etc., can solve the problems of slow core dissolution rate, easy core breakage, and difficult core removal, etc., and achieve excellent dissolution and collapsibility, good Bending strength at room temperature, effect of satisfying performance

Inactive Publication Date: 2021-07-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problems of magnesium oxide ceramic cores for alloy steel are: when the sintering temperature is low, the core strength is low, and the core is easy to break during pouring; when the sintering temperature is high, the core dissolution rate is slow and it is difficult to remove the core

Method used

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  • Magnesium oxide ceramic core with good dissolution collapsibility and preparation method thereof
  • Magnesium oxide ceramic core with good dissolution collapsibility and preparation method thereof
  • Magnesium oxide ceramic core with good dissolution collapsibility and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Weigh a certain amount of magnesium oxide, calcium carbonate and wood powder, wherein 80 parts by weight of magnesium oxide powder, 3 parts by weight of calcium carbonate powder, and 1 part by weight of wood powder; the particle size of magnesium oxide powder is 400 mesh, and the particle size of calcium carbonate powder is 400 mesh, the particle size of wood flour is 200 mesh;

[0031] (2) Put the weighed powder into an oven and dry it at 100°C for 3 hours;

[0032] (3) Put the dried raw materials into the ball mill tank of the planetary ball mill, and ball mill at a speed of 250 r / min for 1.5 hours;

[0033] (4) Prepare 2 parts by weight of tung oil, put the mixture into a mortar, add tung oil, and grind evenly;

[0034] (5) Put the uniformly ground mixture into the mold and hold the pressure for 90 s under the pressure of 6MPa, then remove the film and take out the green body;

[0035] (6) Put the pressed green body into a box-type furnace, and sinter at 1500°C...

Embodiment 2

[0038] (1) Weigh a certain amount of magnesium oxide, calcium carbonate and wood powder, wherein 90 parts by weight of magnesium oxide powder, 5 parts by weight of calcium carbonate powder, and 1 part by weight of wood powder; the particle size of magnesium oxide powder is 400 mesh, and the particle size of calcium carbonate powder is 600 mesh, the particle size of wood flour is 200 mesh;

[0039] (2) Put the weighed powder into an oven and dry it at 100°C for 1 hour;

[0040] (3) Put the dried raw materials into the ball mill tank of the planetary ball mill, and ball mill at a speed of 300 r / min for 1.5 hours;

[0041] (4) Prepare 4 parts by weight of tung oil, put the mixture into a mortar, add tung oil, and grind evenly;

[0042] (5) Put the uniformly ground mixture into the mold and hold the pressure for 100s under the pressure of 5MPa, then remove the film and take out the green body;

[0043] (6) Put the pressed green body into a box furnace, and sinter at 1340°C for 2...

Embodiment 3

[0045](1) Weigh a certain amount of magnesium oxide, calcium carbonate and wood powder, wherein 85 parts by weight of magnesium oxide powder, 10 parts by weight of calcium carbonate powder, and 2 parts by weight of wood powder; the particle size of magnesium oxide powder is 270 mesh, and the particle size of calcium carbonate powder 600 mesh, the particle size of wood flour is 400 mesh;

[0046] (2) Put the weighed powder into an oven and dry it at 110°C for 2 hours;

[0047] (3) Put the dried raw materials into the ball mill tank of the planetary ball mill, and ball mill for 2 hours at a speed of 280r / min;

[0048] (4) Prepare 4 parts by weight of tung oil, put the mixture into a mortar, add tung oil, and grind evenly;

[0049] (5) Put the uniformly ground mixture into the mold and hold the pressure for 120s under the pressure of 4MPa, then remove the film and take out the green body;

[0050] (6) Put the pressed green body into a box furnace, and sinter at 1400°C for 0.5h ...

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Abstract

The invention discloses a magnesium oxide ceramic core with good dissolution collapsibility and a preparation method thereof. The magnesium oxide ceramic core is mainly prepared from 80-100 parts by weight of magnesium oxide, 3-15 parts by weight of calcium carbonate and 1-3 parts by weight of wood flour. The method comprises the following steps: weighing and mixing the magnesium oxide, the calcium carbonate and the wood flour according to a certain proportion, adding the tung oil, uniformly grinding, carrying out compression molding and demolding on the mixed powder to prepare a green body, and heating and sintering the pressed green body according to a certain sintering program to obtain the magnesium oxide ceramic core. Calcium carbonate is adopted as a mineralizer, wood flour is adopted as a pore forming agent, the prepared magnesium oxide ceramic core has good room-temperature bending strength and excellent dissolution collapsibility, in addition, the sintering temperature and the calcium carbonate adding amount can be adjusted according to the requirements for the core performance in the actual use process, and the use performance of the core is met.

Description

technical field [0001] The invention belongs to precision casting materials and a preparation method thereof, in particular to a magnesium oxide ceramic core with good dissolving and collapsibility and a preparation method thereof. Background technique [0002] The development of the aviation industry has greatly promoted the development of investment casting technology, especially in the application of materials such as superalloys, titanium alloys, aluminum alloys and alloy steels, which has promoted the large-scale, complex, integrated and lightweight machine parts. Quantified evolution. Compared with the traditional solidification molding manufacturing process, the complex parts formed by the near-net-shape investment casting technology have the advantages of high dimensional accuracy and low surface roughness, and can produce complex thin-walled parts and complex inner cavity structure castings. [0003] The inner cavity of traditional investment casting castings is ma...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B38/00C04B35/66C04B35/04B22C9/10
CPCC04B38/0025C04B38/0675C04B35/66C04B35/04B22C9/105C04B2235/96C04B2235/442
Inventor 董寅生潘正武张天博黄志海郭超储成林盛晓波
Owner SOUTHEAST UNIV
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