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Preparation method of core additive

An additive and core technology, which is applied in the field of preparation of ceramic core additives, can solve the problems of inability to meet the requirements of melting and casting, low casting qualification rate, low bending strength, etc. The effect of increased deformability

Active Publication Date: 2013-04-17
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used silicon-based cores are thin and easily broken during the pressing process, and the bending strength is low when the pouring temperature is increased, and the casting pass rate is low.
At the same time, with the continuous improvement of engine manufacturing technology, the requirements for manufacturing technology and performance indicators of cores are higher. The existing silicon-based cores cannot meet the requirements of casting, and new technical methods are urgently needed to improve the performance indicators of cores.

Method used

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  • Preparation method of core additive
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  • Preparation method of core additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation method of the core additive satisfies the following requirements:

[0043] Step ①, put the liquid silica sol into a clean stainless steel barrel, put it into an electric drying oven and heat it to 500°C, keep it warm for 4 hours, and then cool the material to room temperature with the furnace;

[0044] Step ②, weigh the solid obtained in the previous process, put it into the ball mill, add the grinding body at a weight ratio of 1:1, mill for 9 hours, pass through a 200-mesh sieve, and pass through the grinding body to obtain powder;

[0045] Step ③, put the powder obtained in the previous process into a ceramic plate, put it into a box-type resistance furnace, and perform high-temperature calcination under the condition of 1160°C-1200°C. The holding time is 4 hours, and the material is cooled with the furnace;

[0046] In step ④, weigh the material calcined at high temperature, put it into a ball mill, and add grinding bodies for ball milling at a weight...

Embodiment 2

[0052] The preparation method of the core additive satisfies the following requirements:

[0053] Step ①, put the liquid silica sol into a clean stainless steel barrel, put it into an electric drying oven and heat it to 520°C, keep it warm for 4 hours, and then cool the material to room temperature with the furnace;

[0054] Step ②, weigh the solid obtained in the previous process, put it into a ball mill, add the grinding body at a weight ratio of 1:1.1, mill for 10 hours, pass through a 150-mesh sieve, and pass through the grinding body to obtain powder;

[0055] Step ③, put the powder obtained in the previous process into a ceramic plate, put it into a box-type resistance furnace, and perform high-temperature calcination at 1160°C-1200°C, the holding time is 5 hours, and the material is cooled with the furnace;

[0056] In step ④, weigh the material after high-temperature calcination, put it into a ball mill, and add grinding bodies for ball milling at a weight ratio of 1:1...

Embodiment 3

[0062] The preparation method of the core additive satisfies the following requirements:

[0063] Step ①, put the liquid silica sol into a clean stainless steel barrel, put it into an electric drying oven and heat it to 480°C, keep it warm for 3.5 hours, and then cool the material to room temperature with the furnace;

[0064] In step ②, weigh the solid obtained in the previous process, put it into a ball mill, add grinding bodies at a weight ratio of 1:0.9, mill for 8 hours, pass through a 250-mesh sieve, and pass through the grinding bodies to obtain powder;

[0065] Step ③, put the powder obtained in the previous process into a ceramic plate, put it into a box-type resistance furnace, and perform high-temperature calcination at 1160°C-1200°C, the holding time is 3.5 hours, and the material is cooled with the furnace;

[0066] In step ④, weigh the material calcined at high temperature, put it into a ball mill, and add grinding bodies for ball milling at a weight ratio of 1:0...

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Abstract

The invention relates to a preparation method of a core additive, which sequentially comprises the following steps: heating liquid silicasol to 500+ / -100 DEG C, keeping the temperature for 2-6 hours, and carrying out furnace cooling on the material to room temperature; weighing the obtained solid, adding the solid into a ball grinder, adding a grinding body according to the weight ratio of 1:(0.7-1.5), carrying out ball grinding for 8-10 hours, and passing through a 150-250-mesh screen to obtain powder; carrying out high-temperature calcination on the powder at 1100-1250 DEG C for 3-10 hours, and carrying out furnace cooling on the material; and weighing the material, adding into a ball grinder, adding a grinding body according to the weight ratio of 1:(0.7-1.5), and carrying out ball grinding for 4-15 hours to obtain amorphous silica core additive powder of which the grain diameter is 7-60 mu m. The silyl core prepared from the amorphous silica additive has the advantages of large specific area and high core pressure molding rate, and enhances the suspensibility and flowability of the core slurry; the sintering characteristic is good; the room-temperature strength and high-temperature strength of the core are high; and the core is easy to strip, and the casting qualification rate is up to 70%.

Description

technical field [0001] The invention relates to a preparation process of a ceramic core additive, which particularly improves a preparation method of an additive capable of improving the room-temperature strength and high-temperature strength of the ceramic core and reducing high-temperature deformation. Background technique [0002] With the continuous increase of the inlet temperature of the engine turbine, the temperature bearing capacity of the blade is required to be higher and higher. The hollow blade prepared by the precision casting technology of the ceramic core has a complex shape of the inner cavity, which can improve the temperature bearing capacity of the blade, uniform temperature distribution, and prolong the service life of the blade. The working conditions of the ceramic core are very harsh, requiring high room temperature strength and high temperature strength. The currently used silicon-based core is thin and easily broken during the pressing process, an...

Claims

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Application Information

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IPC IPC(8): C01B33/12C04B35/63
Inventor 孙革张玲李雪张世东黄静
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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