CN114833305B - Evodia rutaecarpa fiber reinforced ceramic shell back layer slurry and preparation method thereof - Google Patents
Evodia rutaecarpa fiber reinforced ceramic shell back layer slurry and preparation method thereof Download PDFInfo
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- CN114833305B CN114833305B CN202210546518.XA CN202210546518A CN114833305B CN 114833305 B CN114833305 B CN 114833305B CN 202210546518 A CN202210546518 A CN 202210546518A CN 114833305 B CN114833305 B CN 114833305B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/043—Removing the consumable pattern
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a fibrous reinforced ceramic shell back layer slurry of evodia rutaecarpa and a preparation method thereof, wherein the slurry comprises the following components in parts by weight: 55-80 parts of ceramic shell back powder, 0.5-2 parts of common evodia fruit fiber, 18.3-37 parts of binder, 0.1-0.5 part of defoamer, 0.1-0.5 part of preservative and 1-5 parts of deionized water. The method comprises the following steps: adding the binder into a pulp mixing barrel, keeping continuous stirring, adding the herba evodiae fiber into the binder, and stirring to uniformly disperse the herba evodiae fiber in the binder; and (3) continuously stirring, adding ceramic shell back powder into the binder, sequentially adding the defoaming agent, the preservative and the deionized water into a stirring barrel, continuously stirring, transferring the slurry into a slurry dipping barrel, continuously stirring, and keeping the slurry from settling until the viscosity is not changed. The invention can play a role in enhancing the shell, improve the air permeability of the shell, reduce the residual strength of the shell and has the characteristics of simplicity, practicability, low cost and strong applicability.
Description
Technical Field
The invention relates to the technical field of precision casting, in particular to a method for preparing a fiber reinforced ceramic shell back layer slurry of evodia ruticosa.
Background
In order to improve the strength of ceramic shell blanks for investment casting and solve the dewaxing and cracking problems in the dewaxing process, many researchers have developed enhancement technology researches on shells. It is a common practice to add various organic or inorganic fibers to the shell backing slurry for this purpose. In terms of organic fiber addition, literature: S.Jones et al (Journal ofMaterials Processing Technology (2003) 258-265) add nylon fiber into the shell to improve the cracking resistance of the shell during drying and dewaxing; the patent application CN201410142284.8 proposes a method of adding polypropylene fibers to a shell slurry. In terms of inorganic fiber addition, the patent with application number CN201910789323.6 proposes a method of adding glass fibers to a shell slurry, the patent with application number CN201810804250.9 proposes a method of adding zirconia fibers to a shell slurry, and the patent with publication number CN102527937a proposes a method of casting thin-wall shell strength with glass fibers, ceramic fibers, mullite fiber-reinforced titanium alloy. However, the existing organic fibers have higher price, can cause certain pollution to the environment due to decomposition during burning, and are superior to the fiber with very smooth surface and poor interfacial bonding force with the shell back layer, so that the reinforcing effect is poor. The inorganic fiber reinforced ceramic shell is adopted, although good reinforcing effect is provided for the shell from wet blank to roasting, inorganic fiber cannot be burnt out in the process of roasting the shell and casting, so that the shell is poor in yielding property and easy to increase the risk of cracking of the casting in the process of solidifying and cooling the casting, and meanwhile, the inorganic fiber also can cause the increase of the residual strength of the shell, which is unfavorable for the removal of the shell.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the great evodia fiber reinforced ceramic shell back layer slurry and the preparation method thereof, so as to solve the problems of high cost, environmental pollution, high residual strength and the like of the traditional organic or inorganic fiber reinforced ceramic shell.
According to one aspect of the present invention, there is provided a fibrous-reinforced ceramic shell back layer slurry of evodia rutaecarpa, comprising, in parts by weight: 55-80 parts of ceramic shell back powder, 0.5-2 parts of common evodia fruit fiber, 18.3-37 parts of binder, 0.1-0.5 part of defoamer, 0.1-0.5 part of preservative and 1-5 parts of deionized water.
Further, the ceramic shell back layer powder is any one of fused quartz powder, mullite powder and corundum powder, and the granularity of the ceramic shell back layer powder is 200-325 meshes.
Further, the fiber length of the great evodia rutaecarpa fiber is 8-12mm, and the diameter is 30-50 mu m.
Further, the binder is any one of silica sol, water glass and ethyl silicate hydrolysate.
Further, the defoamer is an organosilicon emulsion defoamer.
Further, the viscosity of the ceramic shell back layer slurry is 21-40s, and the pH value of the ceramic shell back layer slurry is 3.2-8.4.
According to another aspect of the present invention, there is provided a method for preparing the above-mentioned fibrous-reinforced ceramic shell back layer slurry of wufeng, the method comprising:
adding the binder into a slurry preparation barrel, and starting a stirrer;
continuously stirring, adding the herba evodiae fiber into the binder, and stirring to uniformly disperse the herba evodiae fiber in the binder;
and (3) continuously stirring, adding ceramic shell back powder into a binder, sequentially adding a defoaming agent, a preservative and deionized water into a stirring barrel, continuously stirring, transferring slurry in a slurry preparation barrel into a slurry dipping barrel, continuously stirring, keeping the slurry from settling until the viscosity is not changed, and obtaining the large-wufeng fiber reinforced ceramic shell back slurry.
Further, after the ceramic shell back powder is added to the binder, it includes: the rotating speed of the stirring paddle is increased, so that vortex appears on the surface of the slurry.
Further, the steps of sequentially adding the defoaming agent, the preservative and the deionized water into the stirring barrel and continuously stirring comprise the following steps: the stirring time is 2-4h.
Compared with the prior art, the invention has at least one of the following beneficial effects:
1. according to the invention, the great wufeng grass fiber reinforced ceramic shell back layer slurry and the preparation method thereof, because the great wufeng grass fiber has a better toughness and a bamboo shoot-shaped structure, the great wufeng grass fiber can be tightly combined with powder and a binder in the ceramic shell, when dewaxing, roasting and heating are carried out, the investment pattern expands, and when compressive stress is caused to the shell, the great Wu Feng grass fiber can play a role in reinforcing, so that the shell is prevented from cracking.
2. According to the invention, the large Wu Feng grass fiber can be completely burnt out without residues in the roasting process of the shell, so that the air permeability of the shell can be improved, and the residual strength of the shell can be reduced.
3. Because the Chinese evodia fiber is easy to obtain, has no cost or low cost, and can be directly added into the shell slurry by simple drying and screening treatment, the invention has the characteristics of simplicity, easiness, low cost and strong applicability.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic flow chart of a method for preparing a fibrous reinforced ceramic shell back slurry of Evodia rutaecarpa in accordance with an embodiment of the present invention;
FIG. 2 is a schematic representation of the results of optical microscopy characterization of (a) a spherical cap of Mesona chinensis and (b) a fiber of Mesona chinensis in an embodiment of the invention;
FIG. 3 is a schematic diagram of microscopic morphology characterization results of (a) 200 times and (b) 1000 times of the amplification of the Wu Mesona fiber in the example of the present invention;
FIG. 4 is a schematic representation of the appearance of the ceramic shell after (a) investment and (b) dewaxing firing of the stainless steel booster turbine of example 1;
FIG. 5 is a schematic representation of the appearance of a ceramic shell after (a) investment and (b) dewaxed firing of a superalloy pump housing in example 2;
FIG. 6 is a schematic diagram showing the appearance of a ceramic shell after dewaxing and roasting of a stainless steel booster turbine investment blank control group (without adding Wu Feng grass fiber) in example 6.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention. In describing embodiments of the present invention, it should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and in the above-described drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein.
The embodiment of the invention provides a fibrous reinforced ceramic shell back layer slurry of evodia rutaecarpa, which comprises the following components in parts by weight: 55-80 parts of ceramic shell back powder, 0.5-2 parts of common evodia fruit fiber, 18.3-37 parts of binder, 0.1-0.5 part of defoamer, 0.1-0.5 part of preservative and 1-5 parts of deionized water. Wherein, the back powder and the adhesive are used as main materials; the fibre of the great evodia is a reinforcing phase, and the addition amount is slightly different according to different slurry systems; defoamers and preservatives account for about 1-5% of the slurry system.
In some embodiments, the ceramic shell back powder is any one of fused silica powder, mullite powder, and corundum powder, and the ceramic shell back powder has a particle size of 200-325 mesh, which ensures that the shell has a suitable porosity. In other embodiments, other types of ceramic shell back powder may be used as long as the same function as in the examples of the present invention is achieved.
The wufenugreek fibers are taken from air-dried wufenugreek crowns, and referring to fig. 2 and 3, are macroscopically shaped like "dandelions" and microstructure like "bamboo shoots", and in some embodiments, have a fiber length of 8-12mm and a diameter of 30-50 μm, and such length and diameter fibers are convenient for addition to the slurry and can effectively enhance the strength of the shell.
In some embodiments, the binder is any one of several commonly used in the industry, such as silica sol, water glass, and ethyl silicate hydrolysate. In other embodiments, other types of adhesives may be used, as long as the same function as in the examples of the present invention is achieved.
The defoamer eliminates bubbles in the aqueous coating by reducing the surface tension, and can be a water-based coating defoamer commonly used in the art, preferably the defoamer is a silicone emulsion defoamer, and can effectively eliminate bubbles generated in a slurry system. The preservative can prevent spoilage, and can be used as a preservative commonly used in the art, preferably BIT20 broad-spectrum antibacterial preservative. Deionized water can be commercially available deionized water.
In some embodiments, the viscosity of the ceramic shell backing slurry is 21-40s and the pH of the ceramic shell backing slurry is 3.2-8.4. Viscosity directly reflects the flow properties of the slurry system and determines the coating properties of the slurry, the pH of which affects its viscosity.
The embodiment of the invention also provides a preparation method of the Wu-Mesona fiber reinforced ceramic shell back layer slurry, and referring to FIG. 1, the method comprises the following steps:
s1, adding a binder into a slurry mixing barrel, and starting a stirrer;
s2, keeping continuous stirring, adding the herba evodiae fiber into the binder, and stirring to enable the herba evodiae fiber to be uniformly dispersed in the binder;
and S3, keeping continuous stirring, adding ceramic shell back layer powder into the binder, sequentially adding the defoaming agent, the preservative and the deionized water into the stirring barrel, continuously stirring, transferring the slurry in the slurry preparation barrel into the slurry dipping barrel, continuously stirring, keeping the slurry from settling until the viscosity is not changed, and obtaining the wufeng fiber reinforced ceramic shell back layer slurry.
In order to uniformly disperse the galenical fibers in the binder, in some specific embodiments, after adding the ceramic shell backing powder to the binder, it comprises: the rotating speed of the stirring paddle is increased, so that vortex appears on the surface of the slurry.
The addition sequence of sequentially adding the defoaming agent, the preservative and the deionized water is favorable for obtaining the slurry with good performance, and the stirring is used for preventing the slurry from settling and condensing, and the stirring time is related to the components of the slurry system. In some embodiments, adding the defoamer, the preservative and the deionized water sequentially to the mixing drum and continuing the mixing, comprising: the stirring time is 2-4h.
In some embodiments, the viscosity of the ceramic shell backing slurry is measured using a number 5 flow cup because the size of the aperture of the number 5 flow cup is suitable for testing the viscosity of the backing slurry, and when the viscosity is no longer changing, it is indicated that the slurry has been uniformly mixed, i.e., the wufeng fiber-reinforced ceramic shell backing slurry is obtained.
The following is a more detailed description of the fibrous-reinforced ceramic shell back slurry of the present invention and the method of preparing the same using examples. The preparation method of the fibrous reinforced ceramic shell back layer slurry of the great evodia rutaecarpa in the following examples is implemented according to the process flow chart shown in figure 1.
Example 1
The preparation method of the fibrous reinforced ceramic shell back layer slurry of the evodia rutaecarpa in the embodiment comprises the following steps:
s1, adding 18.3 parts of silica sol into a slurry preparation barrel, and starting a stirrer;
s2, keeping continuous stirring, adding 0.5 part of the common evodia fruit fibers into the liquid silica sol, and stirring for 5min to uniformly disperse the common evodia fruit fibers in the silica sol;
s3, keeping continuous stirring, adding 80 parts of fused quartz powder into silica sol, sequentially adding 0.1 part of defoaming agent, 0.1 part of preservative and 1 part of deionized water into a stirring barrel, continuously stirring, increasing the rotating speed of a stirring paddle to enable the surface of slurry to generate vortex, stirring for 2 hours, transferring the slurry in a slurry preparation barrel into a slurry dipping barrel, continuously stirring through an L-shaped stirring paddle in the slurry dipping barrel, and keeping the slurry from sedimentation until the viscosity is not changed, thus obtaining the large-wu-grass fiber reinforced ceramic shell back layer slurry.
The viscosity of the ceramic shell backing slurry was measured using a No. 5 flow cup and the slurry pH was 8.1.
Example 2
The preparation method of the fibrous reinforced ceramic shell back layer slurry of the evodia rutaecarpa in the embodiment comprises the following steps:
s1, adding 27.2 parts of water glass into a slurry mixing barrel, and starting a stirrer;
s2, keeping continuous stirring, adding 1.2 parts of the common evodia fruit fibers into the liquid water glass, and stirring for 5min to uniformly disperse the common evodia fruit fibers in the water glass;
s3, continuously stirring, adding 68 parts of mullite powder into water glass, sequentially adding 0.3 part of defoamer, 0.3 part of preservative and 3 parts of deionized water into a stirring barrel, continuously stirring, increasing the rotating speed of a stirring paddle to enable the surface of slurry to generate vortex, stirring for 4 hours, transferring the slurry in a slurry preparation barrel into a slurry dipping barrel, continuously stirring through an L-shaped stirring paddle in the slurry dipping barrel, and keeping the slurry from sedimentation until the viscosity is not changed, thus obtaining the great wufeng fiber reinforced ceramic shell back layer slurry.
The viscosity of the ceramic shell backing slurry was measured using a No. 5 flow cup and the slurry pH was 7.9 for 32 s.
Example 3
The preparation method of the fibrous reinforced ceramic shell back layer slurry of the evodia rutaecarpa in the embodiment comprises the following steps:
s1, adding 37 parts of ethyl silicate hydrolysate into a slurry preparation barrel, and starting a stirrer;
s2, keeping continuous stirring, adding 2 parts of the common evodia fruit fibers into the liquid ethyl silicate hydrolysate, and stirring for 10min to enable the common evodia fruit fibers to be uniformly dispersed in the ethyl silicate hydrolysate;
s3, continuously stirring, adding 55 parts of corundum powder into the ethyl silicate hydrolysate, sequentially adding 0.5 part of defoaming agent, 0.5 part of preservative and 5 parts of deionized water into a stirring barrel, continuously stirring, increasing the rotating speed of a stirring paddle to enable the surface of slurry to generate vortex, stirring for 2 hours, transferring the slurry in a slurry preparation barrel into a slurry dipping barrel, continuously stirring through an L-shaped stirring paddle in the slurry dipping barrel, and keeping the slurry from sedimentation until the viscosity is not changed, thus obtaining the large-wu-grass fiber reinforced ceramic shell back layer slurry.
The viscosity of the ceramic shell backing layer of the slurry was measured using a No. 5 flow cup and the pH of the slurry was 3.5.
Example 4
The preparation method of the fibrous reinforced ceramic shell back layer slurry of the evodia rutaecarpa in the embodiment comprises the following steps:
s1, adding 27.2 parts of silica sol into a slurry preparation barrel, and starting a stirrer;
s2, keeping continuous stirring, adding 1.2 parts of the common evodia fruit fibers into the liquid silica sol, and stirring for 10min to uniformly disperse the common evodia fruit fibers in the silica sol;
s3, keeping continuous stirring, adding 68 parts of fused quartz powder into silica sol, sequentially adding 0.3 part of defoaming agent, 0.3 part of preservative and 3 parts of deionized water into a stirring barrel, continuously stirring, increasing the rotating speed of a stirring paddle to enable the surface of slurry to generate vortex, stirring for 4 hours, transferring the slurry in a slurry preparation barrel into a slurry dipping barrel, continuously stirring through an L-shaped stirring paddle in the slurry dipping barrel, and keeping the slurry from sedimentation until the viscosity is not changed, thus obtaining the large-wu-grass fiber reinforced ceramic shell back layer slurry.
The viscosity of the ceramic shell backing layer of the slurry was measured using a No. 5 flow cup and the pH of the slurry was 8.4.
Example 5
The preparation method of the fibrous reinforced ceramic shell back layer slurry of the evodia rutaecarpa in the embodiment comprises the following steps:
s1, adding 37 parts of water glass into a slurry mixing barrel, and starting a stirrer;
s2, keeping continuous stirring, adding 2 parts of the common evodia fruit fibers into the liquid water glass, and stirring for 6min to uniformly disperse the common evodia fruit fibers in the water glass;
s3, keeping continuous stirring, adding 55 parts of mullite powder into water glass, sequentially adding 0.5 part of defoamer, 0.5 part of preservative and 5 parts of deionized water into a stirring barrel, continuously stirring, increasing the rotating speed of a stirring paddle to enable the surface of slurry to generate vortex, stirring for 3 hours, transferring the slurry in a slurry preparation barrel into a slurry dipping barrel, continuously stirring through an L-shaped stirring paddle in the slurry dipping barrel, keeping the slurry not to be settled until the viscosity is not changed, and obtaining the great wu grass fiber reinforced ceramic shell back layer slurry.
The viscosity of the ceramic shell backing slurry was measured using a No. 5 flow cup and the slurry pH was 8.3 for 24 s.
Example 6
The preparation method of the fibrous reinforced ceramic shell back layer slurry of the evodia rutaecarpa in the embodiment comprises the following steps:
s1, adding 18.3 parts of ethyl silicate hydrolysate into a slurry preparation barrel, and starting a stirrer;
s2, keeping continuous stirring, adding 0.5 part of the common evodia fruit fibers into the liquid ethyl silicate hydrolysate, and stirring for 8min to uniformly disperse the common evodia fruit fibers in the ethyl silicate hydrolysate;
s3, continuously stirring, adding 80 parts of corundum powder into the ethyl silicate hydrolysate, sequentially adding 0.1 part of defoaming agent, 0.1 part of preservative and 1 part of deionized water into a stirring barrel, continuously stirring, increasing the rotating speed of a stirring paddle to enable the surface of slurry to generate vortex, stirring for 3 hours, transferring the slurry in a slurry preparation barrel into a slurry dipping barrel, continuously stirring through an L-shaped stirring paddle in the slurry dipping barrel, and keeping the slurry from sedimentation until the viscosity is not changed, thus obtaining the large-wu-grass fiber reinforced ceramic shell back layer slurry.
The viscosity of the ceramic shell backing slurry was measured using a No. 5 flow cup and the slurry pH was 3.3 for 38 s.
Example 7
The preparation method of the fibrous reinforced ceramic shell back layer slurry of the evodia rutaecarpa in the embodiment comprises the following steps:
s1, adding 37 parts of silica sol into a slurry mixing barrel, and starting a stirrer;
s2, keeping continuous stirring, adding 2 parts of the common evodia fruit fibers into the liquid silica sol, and stirring for 5min to uniformly disperse the common evodia fruit fibers in the silica sol;
s3, keeping continuous stirring, adding 55 parts of fused quartz powder into silica sol, sequentially adding 0.5 part of defoaming agent, 0.5 part of preservative and 5 parts of deionized water into a stirring barrel, continuously stirring, increasing the rotating speed of a stirring paddle to enable the surface of slurry to generate vortex, stirring for 2.5 hours, transferring the slurry in a slurry preparation barrel into a slurry dipping barrel, continuously stirring through an L-shaped stirring paddle in the slurry dipping barrel, and keeping the slurry from settling until the viscosity is not changed, thus obtaining the ceramic shell back layer slurry reinforced by the Chinese evodia fibers.
The viscosity of the ceramic shell backing slurry was measured using a No. 5 flow cup and the slurry pH was 8.0.
Example 8
The preparation method of the fibrous reinforced ceramic shell back layer slurry of the evodia rutaecarpa in the embodiment comprises the following steps:
s1, adding 18.3 parts of water glass into a slurry mixing barrel, and starting a stirrer;
s2, keeping continuous stirring, adding 0.5 part of the common evodia fruit fibers into the liquid water glass, and stirring for 10min to uniformly disperse the common evodia fruit fibers in the water glass;
s3, keeping continuous stirring, adding 80 parts of mullite powder into water glass, sequentially adding 0.1 part of defoamer, 0.1 part of preservative and 1 part of deionized water into a stirring barrel, continuously stirring, increasing the rotating speed of a stirring paddle to enable the surface of slurry to generate vortex, stirring for 3.5h, transferring the slurry in a slurry preparation barrel into a slurry dipping barrel, continuously stirring through an L-shaped stirring paddle in the slurry dipping barrel, and keeping the slurry from sedimentation until the viscosity is not changed, thus obtaining the large-wu-grass fiber reinforced ceramic shell back layer slurry.
The viscosity of the ceramic shell backing slurry was measured using a No. 5 flow cup and the slurry pH was 7.8 for 36 s.
Example 9
The preparation method of the fibrous reinforced ceramic shell back layer slurry of the evodia rutaecarpa in the embodiment comprises the following steps:
s1, adding 27.2 parts of ethyl silicate hydrolysate into a slurry preparation barrel, and starting a stirrer;
s2, keeping continuous stirring, adding 1.2 parts of the common evodia fruit fibers into the liquid ethyl silicate hydrolysate, and stirring for 10min to uniformly disperse the common evodia fruit fibers in the ethyl silicate hydrolysate;
s3, continuously stirring, adding 68 parts of corundum powder into the ethyl silicate hydrolysate, sequentially adding 0.3 part of defoaming agent, 0.3 part of preservative and 3 parts of deionized water into a stirring barrel, continuously stirring, increasing the rotating speed of a stirring paddle to enable the surface of slurry to generate vortex, stirring for 3 hours, transferring the slurry in a slurry preparation barrel into a slurry dipping barrel, continuously stirring through an L-shaped stirring paddle in the slurry dipping barrel, and keeping the slurry from sedimentation until the viscosity is not changed, thus obtaining the large-wu-grass fiber reinforced ceramic shell back layer slurry.
The viscosity of the ceramic shell backing slurry was measured using a No. 5 flow cup and the slurry pH was 3.2 for 29 s.
The ceramic shell back layer slurries of examples 1-9 were used to prepare ceramic shells and the ceramic shells were characterized for performance, the results of which are shown in table 1.
TABLE 1 characterization of the ceramic shell Performance results
To illustrate the effect of the ceramic shells prepared from the ceramic shell backing slurry of the present example, a comparison was made with ceramic shells without added wufeng grass fibers, wherein the investment and dewaxed fired ceramic shells of the stainless steel booster turbine of example 1 are seen in fig. 4, the investment and dewaxed fired ceramic shells of the superalloy pump casing of example 2 are seen in fig. 5, and the dewaxed fired ceramic shells of the stainless steel booster turbine investment blank of example 6 are seen in fig. 6; the result shows that: 1) The ceramic shell prepared by taking the great evodia fibers as the reinforcing phase to prepare the shell back layer slurry has no cracking in the dewaxing, roasting and heating processes, and the ceramic shell without the great evodia fibers has cracking at different degrees; 2) The herba Wu Mesonae fiber is a natural plant fiber, can be completely burnt out in air at high temperature, has a porosity of 10-18% of the shell without herba Wu Mesonae, and has air permeability3-5×10 -13 m 2 The residual strength is 4MPa; the porosity of the shell added with the Wu grass is improved to 15-33%, and the air permeability is improved to 8-15×10 -13 m 2 The participation strength is 2-3MPa. It can be seen that the porosity and air permeability of the shell are remarkably improved and the residual strength is reduced by adding the evodia rutaecarpa.
According to the large wufeng grass fiber reinforced ceramic shell back layer slurry and the preparation method thereof, the large wufeng grass fiber has good toughness and a bamboo shoot-shaped structure, and can be tightly combined with powder and a binder in the ceramic shell, when dewaxing, roasting and heating are carried out, an investment pattern expands, and when compressive stress is caused to the shell, the large Wu Feng grass fiber can play a role in reinforcing, so that the shell is prevented from cracking. In the roasting process of the shell, the large Wu Feng grass fiber can be completely burnt out without residues, so that the air permeability of the shell can be improved, and the residual strength of the shell can be reduced. Moreover, the great evodia fiber is easy to obtain, has no cost or low cost, and can be directly added into the shell slurry by simple drying and screening treatment, so that the great evodia fiber reinforced ceramic shell back layer slurry and the preparation method thereof have the characteristics of simplicity, easiness, low cost and strong applicability.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the invention. The above-described preferred features may be used in any combination without collision.
Claims (7)
1. The fibrous reinforced ceramic shell back layer slurry of the evodia rutaecarpa is characterized by comprising the following components in parts by weight: 55-80 parts of ceramic shell back powder, 0.5-2 parts of common evodia fruit fiber, 18.3-37 parts of binder, 0.1-0.5 part of defoamer, 0.1-0.5 part of preservative and 1-5 parts of deionized water; the ceramic shell back layer powder is fused quartz powder or corundum powder; the binder is water glass or ethyl silicate hydrolysate; the fiber length of the great evodia fiber is 8-12mm, and the diameter is 30-50 mu m.
2. The fibrous reinforced ceramic shell back slurry of wufeng grass of claim 1, wherein the particle size of the ceramic shell back powder is 200-325 mesh.
3. The fiber reinforced ceramic shell back slurry of wufenugreek according to claim 1, wherein the defoamer is a silicone emulsion defoamer.
4. The fibrous reinforcing ceramic shell back slurry of evodia rutaecarpa of claim 1, wherein the viscosity of the ceramic shell back slurry is 21-40s and the pH of the ceramic shell back slurry is 3.2-8.4.
5. A method of preparing the fibrous reinforced ceramic shell back slurry of wufeng herb of any one of claims 1-4, comprising:
adding the binder into a slurry preparation barrel, and starting a stirrer;
continuously stirring, adding the herba evodiae fiber into the binder, and stirring to uniformly disperse the herba evodiae fiber in the binder;
and (3) continuously stirring, adding ceramic shell back powder into a binder, sequentially adding a defoaming agent, a preservative and deionized water into a stirring barrel, continuously stirring, transferring slurry in a slurry preparation barrel into a slurry dipping barrel, continuously stirring, keeping the slurry from settling until the viscosity is not changed, and obtaining the large-wufeng fiber reinforced ceramic shell back slurry.
6. The method of preparing a fibrous reinforced ceramic shell back slurry of wufeng according to claim 5, comprising, after said adding of the ceramic shell back powder to the binder: the rotating speed of the stirring paddle is increased, so that vortex appears on the surface of the slurry.
7. The method for preparing the fiber reinforced ceramic shell back slurry of evodia rutaecarpa according to claim 5, wherein said sequentially adding defoamer, preservative and deionized water into the stirring barrel and continuing stirring comprises: the stirring time is 2-4h.
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| CN103639359B (en) * | 2013-11-01 | 2018-02-16 | 南昌航空大学 | A kind of preparation method based on composite fibre enhancing precision investment casting mould case |
| CN203737936U (en) * | 2014-03-15 | 2014-07-30 | 内蒙古工业大学 | Fiber-reinforced investment casting composite shell |
| CN103962506B (en) * | 2014-04-11 | 2016-04-06 | 内蒙古工业大学 | The preparation method of moltening mold castings fiber-reinforced composite silicasol case |
| CN104399885B (en) * | 2014-10-28 | 2017-01-25 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for increasing permeability of investment cast ceramic shell |
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