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Method for changing strength of shell by impregnating with organic binder

An organic binder and strength technology, applied in the direction of casting mold, core, casting mold composition, etc., can solve the problems of reducing slurry stability, type, content, length, affecting slurry and shell performance, etc., to increase The effect of room temperature strength

Active Publication Date: 2014-07-16
TSINGHUA UNIV
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Problems solved by technology

The main difficulty of adding fiber is that the type, content and length of the fiber will significantly affect the performance of the slurry and the shell, and must be selected according to the actual shell material and viscosity; adding latex at the same time will reduce the stability of the slurry

Method used

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  • Method for changing strength of shell by impregnating with organic binder
  • Method for changing strength of shell by impregnating with organic binder
  • Method for changing strength of shell by impregnating with organic binder

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Embodiment Construction

[0015] The present invention aims to provide a method for changing the strength of the investment casting mold shell by impregnating an organic binder, so as to solve the problems of insufficient normal temperature strength and high residual strength of the current mold shell. Taking different impregnation schemes of silica sol-kaolin shells as examples, the present invention will be further described in detail in combination with specific examples and accompanying drawings.

[0016] As shown in Table 1, it shows the preparation and impregnation process of the shell, the binder is silica sol GS30, the refractory material is calcined kaolin, the drying time between layers and after impregnation is 24 hours, and the impregnation time is 5 minutes.

[0017] Table 1 Shell preparation process

[0018]

[0019] Impregnation solution: 00-none; L1-low latex; L2-high glue; P1-low PVA; P2-high PVA; Si-silica sol

[0020] The results of normal temperature strength, high temperature s...

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Abstract

The invention discloses a method for changing strength of a shell by impregnating with an organic binder. An impregnating solution adopts 0.5-4 wt% of a PVA solution, 2-20 wt% of a latex solution or a liquid with preset viscosity. Impregnation time is 2-10 min. impregnation is carried out layer by layer, every few layers or only at a slurry seal layer. After the shell is dried, the next layer of shell is continuously prepared, or dewaxing is conducted after the slurry seal layer is impregnated and dried. The method provided by the invention has high reliability and is simple to operate. Through adjusting type and concentration of the impregnating solution and number of impregnation layers, strength performance of shells made of various materials can be conveniently changed. Through impregnation, layer strength is increased; normal temperature strength of the shell is raised; dewaxing crack resistance is enhanced; combination of front and rear impregnated layers is weakened; retained strength is reduced; shelling performance is improved; and the problem that strength of a mould investment casting shell is hard to coordinate and control is solved.

Description

technical field [0001] The invention relates to the technical field of investment casting mold shells, in particular to a method for changing the strength of mold shells by impregnating organic binders. Background technique [0002] Strength property is one of the most basic properties of the investment casting shell. There are three strength properties of the shell, namely normal temperature strength, high temperature strength and residual strength. The three are related but different. Silica sol shell is one of the most commonly used shells at present. Its main problem is that the strength at room temperature is low, and the high temperature and residual strength are high. During the dewaxing process, the expansion of the wax will produce high stress on the mold shell, and the low strength at room temperature will easily lead to cracks in the mold shell; while the high residual strength is not conducive to cleaning after pouring. [0003] The current method of changing th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04
Inventor 吕志刚郭馨徐明洪艾厚望
Owner TSINGHUA UNIV
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