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Packing powder for sintering ceramic core

A technology for sintering ceramics and cores, which is applied to cores, casting molds, casting molding equipment, etc., can solve the problems of difficult removal, unfavorable wax removal, and poor wax removal effect, so as to improve the qualification rate and provide good support. , The effect of good wax removal ability and surface finish

Active Publication Date: 2014-09-17
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally available fillers include industrial alumina powder calcined at 1200°C-1450°C, talc powder and quartz powder calcined at 800°C-1200°C, magnesium oxide powder calcined at 900°C, etc. If the filler powder is too fine, then It is not conducive to wax removal, it is easy to stick to the surface of the core and is not easy to remove, and the pass rate of the core is low; if the powder is too thick, the effect of wax removal is not good, and the quality of the core surface decreases

Method used

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  • Packing powder for sintering ceramic core
  • Packing powder for sintering ceramic core
  • Packing powder for sintering ceramic core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A certain proportion of fine particle powder and ceramic balls of a certain diameter are reasonably proportioned, and the mass ratio of fine particle powder to ceramic ball is 3:1; the fine particle powder is alumina powder, and the mesh number is 100 mesh; the material of the ceramic ball is It is alumina, with a diameter of 0.5 mm; ceramic balls and fine particle powder are mixed by ball milling, the mass ratio of the mixture powder composed of ceramic balls and fine particle powder to balls for ball milling is 1:1, and the balls for ball milling are alumina balls , the speed of the ball mill is 300 rpm, and the ball milling time is 10 hours; the ball-milled filler powder is put into a sagger, the prepared ceramic core is placed in the filler, and then dewaxed, and then heated to the sintering temperature for the ceramic mold. The core is sintered and cooled with the furnace; after the cooling, the ceramic core is cleaned to obtain a finished ceramic core. The finished...

Embodiment 2

[0022] Mix quartz powder with a mass ratio of 5:1 and quartz glass ceramic balls, wherein the mesh number of the quartz powder is 200 mesh; the diameter of the quartz glass ceramic balls is 1 mm; the quartz powder and the quartz glass ceramic balls are mixed by ball milling, mixing The mass ratio of the material powder to the balls for ball milling is 2:1, the balls for ball milling are alumina balls, the rotating speed of the ball mill is 600 rpm, and the ball milling time is 50 hours; The ceramic core is placed in the filler, then dewaxed, and then heated to the sintering temperature to sinter the ceramic core and cool with the furnace; after cooling, the ceramic core is cleaned to obtain a finished ceramic core. Above 85%, the surface is very smooth, see figure 2 .

Embodiment 3

[0024] Mix talc powder with a mass ratio of 8:1 and alumina ceramic balls, wherein the mesh number of talc powder is 150 mesh; the diameter of alumina ceramic balls is 0.5 mm; talc powder and alumina ceramic balls are mixed by ball milling, and the The mass ratio of the material powder to the balls for ball milling is 2:1, the balls for ball milling are alumina balls, the rotating speed of the ball mill is 600 rpm, and the ball milling time is 20 hours; The ceramic core is placed in the filler, then dewaxed, and then heated to the sintering temperature to sinter the ceramic core and cool with the furnace; after cooling, the ceramic core is cleaned to obtain a finished ceramic core. Above 90%, the surface is very smooth, see image 3 .

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Abstract

The invention aims to provide packing powder for sintering a ceramic core. The packing powder is characterized by being formed by mixing fine particle powder and ceramic balls, wherein the mass ratio of the fine particle powder to the ceramic balls ranges from (3:1) to (10:1). The packing powder has certain de-waxing capability in a biscuit de-waxing phase, has high supporting capability in a sintering process and guarantees that the finished product ceramic core has no gravity deformation and has certain surface smoothness; the yield in a production process of the ceramic core can be improved.

Description

technical field [0001] The invention belongs to the technical field of precision casting, in particular to the preparation technology of a ceramic core. Background technique [0002] The inner cavities of high-temperature alloy blades and castings with complex structures are usually prepared with ceramic cores. The ceramic core is generally prepared by injection molding method, and then sintered at a certain temperature. In the sintering process of the ceramic core, no matter in the dewaxing stage or the sintering stage, it is often required to pre-embed the core body with filler. The purpose of burying is: to improve the uniformity and stability of the temperature field distribution around the core body, avoid surface radiation and reduce temperature fluctuations; reduce the pressure gradient on the surface of the core body, and avoid the core during dewaxing and sintering Deformation; reduce the possibility of defects in the core sintering process and improve the sinteri...

Claims

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Application Information

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IPC IPC(8): B22C1/00C04B35/64
Inventor 姜卫国李凯文张健王莉
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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