CN108568492A - A kind of preparation method of the special molding sand of hot investment casting - Google Patents
A kind of preparation method of the special molding sand of hot investment casting Download PDFInfo
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- CN108568492A CN108568492A CN201810450112.5A CN201810450112A CN108568492A CN 108568492 A CN108568492 A CN 108568492A CN 201810450112 A CN201810450112 A CN 201810450112A CN 108568492 A CN108568492 A CN 108568492A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/224—Furan polymers
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Abstract
The invention discloses a kind of preparation methods of the special molding sand of hot investment casting：Step 1 weighs raw material, and after above-mentioned raw materials being ground to respectively less than 5 μm, it is 12 μm that mixing, which is placed in planetary-type grinding machine and is ground to particle size range, and molding sand ontology is made；Step 2, by phosphoric acid and P-TOLUENE SULFO ACID 99 with molar ratio 1：（1.2‑1.3）It is mixed, furan resin hardener is made；Furan resin hardener in step 1 Sand ontology and step 2 is carried out mixing, obtains required molding sand by step 3, molding sand using in preceding 30min.The present invention provides one kind being suitable for precision casting process, with high intensity and thermal stability, it is resistant to the preparation method of the molding sand of the larger outer force effect in 1500 DEG C or more of high temperature and casting process, the molding sand that the present invention prepares has good gas permeability, gas and heat extra in casting process can quickly be discharged, make hot investment casting process efficiency higher.
Description
Technical field
The invention belongs to hot investment casting fields, and in particular to a kind of preparation method of the special molding sand of hot investment casting.
Background technology
Casting be it is a kind of by METAL HEATING PROCESS at liquid, liquid metal slurry is then poured into the effigurate casting mold of tool
In, make liquid metal slurry in external force, as being full of cavity under pressure, gravity, cooling simultaneously solidifies to be formed with cavity shape
The process of casting.In many casting methods, be applied to hot investment casting, sand casting process be it is most commonly seen, simultaneously
Also it applies at most.In sand casting process, molding sand will produce gas or table due to the heat effect by high-temperature liquid metal
The change of character occurs for face, these variations can all change the quality of casting.The quality of casting and the quality of molding sand are closely related,
In foundry production, the defect of casting is largely caused by the quality problems by molding sand, what stealthy quality and
Caused by casting wasted product account for about the 30%-50% of total waste product, therefore the performance of molding sand is to ensure an important ring for casting quality.Casting
The technological parameter that need to be considered with molding sand includes mainly：It is sand humidity content, compact rate of molding, gas permeability, clay content, green compression strength, wet
Tensile strength, shearing strength etc. confirm that suitable molding sand indices can ensure being normally carried out for metal Foundry Production.
High-quality molding sand need to have following characteristics：
1, there is higher intensity and thermal stability, to bear the effect of various external force and high temperature；
2, there is good mobility, i.e., the ability that molding sand is mutually shifted under external force or gravity itself between sand grains；
3, with certain plasticity, i.e. molding sand deforms under external force, and shape to be administered can be kept after external force removes
Ability；
4, there is good gas permeability, i.e. molding sand hole to penetrate the ability of gas；
5, there is good collapsibility, also known as knockability, i.e., whether molding sand is easily destroyed after casting solidification, if be easy from casting
The performance removed on part.
In These characteristics, it is applied in precision casting process, is most difficult to reach use with intensity, stable type and gas permeability and want
It asks.Be particularly applied to during large volume of cast casting, due to reasons in structure heat dissipation it is unsmooth so as to cause hot-spot,
The problems such as local pressure is excessive becomes the arch-criminal that precision casting process yield can not be promoted.
Invention content
In order to solve the deficiencies in the prior art, the present invention provides one kind being suitable for precision casting process, has height
Intensity and thermal stability, be resistant to the molding sand of the larger outer force effect in 1500 DEG C or more of high temperature and casting process
Preparation method, the molding sand that the present invention prepares have good gas permeability, gas extra in casting process can quickly be discharged
And heat, make hot investment casting process efficiency higher, while the molding sand prepared in the present invention can make casting in casting process
Surface roughness reduces, and forms smooth surface, and the molding sand prepared in the present invention has well after casting technique
Collapsibility, after casting solidification molding sand be very easy to is removed from casting.
Institute of the invention technique effect to be achieved is realized by following scheme：
The preparation method of the special molding sand of hot investment casting provided in the present invention, includes the following steps：
Step 1 weighs raw material according to following component and mass fraction：
30-40 parts of quartz sand
Nitrogenize 10-15 parts of silica sand
5-8 parts of acid fiber by polylactic
3-4 parts of chitin fiber
2-4 parts of alumina powder
0.8-1.5 parts of furane resins
10-12 parts of emollient component
Environmentally friendly component 1-2 parts
After above-mentioned raw materials being ground to respectively less than 5 μm, it is 1-2 μ that mixing, which is placed in planetary-type grinding machine and is ground to particle size range,
Molding sand ontology is made in m；
Step 2, by phosphoric acid and P-TOLUENE SULFO ACID 99 with molar ratio 1：（1.2-1.3）It is mixed, furan resin hardener is made；
Step 3, molding sand carry out the furan resin hardener in step 1 Sand ontology and step 2 using in preceding 30min
Mixing obtains required molding sand.
The composition of molding sand ontology is improved first in the present invention, quartz sand or clay are utilized merely with traditional
The molding sand of mineral is different, is whole caking after single quartz sand or molding sand sintering comprising clay mineral, and
Hardness is very high, more crisp.Silicon nitride sand facies are added in quartz sand be adapted to the bone for collectively forming composite sand in the present invention
Frame material adds furane resins with being adapted in above-mentioned framework material, constitutes the molding sand of novel air-set mold, adds furans tree
Molding sand after fat forms the ventilating structure with small hole in casting process through high-temperature calcination of casting, and can not only quickly dissipate
Heat, while can also effectively be vented, meet very much the demand of hot investment casting.The cooperation of quartz sand and nitridation silica sand can not only be into
One step increases the intensity of molding sand, additionally it is possible to be effectively increased the toughness of molding sand.Meanwhile it is appropriate also to add in framework material certain
The alumina powder of amount, further increasing the moulding of molding sand can high temperature resistant property.
The molding sand of air-set mold can have hardness, insufficient strength, change in size since there are the structures of gas permeability toward contact
Greatly, the air hole size of generation is inhomogenous, and the air hole of part larger aperture will produce adverse effect to surface roughness
The problem of, the present invention in molding sand in also added a certain amount of acid fiber by polylactic and chitin fiber, fibrous material is being cast
In the process since high temperature can form uniform tiny duct, while emollient component is also added in the present invention for improving molding sand
Surface state, after being added to the molding sand high temperature contact of emollient component, the surface energy on surface is substantially reduced, and can make the gold of liquid
Belong to molten surface not infiltrate it, to form smooth surface, improves the precision of casting.Further, in order to make molding sand exist
The gap generated in casting process is more uniformly distributed, and also added environmentally friendly component in the present invention.
Further, in step 1, bottom ash, montmorillonite after the environmental protection component is glass bead, ramie is burned, oxidation
Zirconium powder is with mass ratio 1：（1-1.2）：（0.2-0.4）：（0.08-0.1）The powder body material being mixed to form.Environmentally friendly group in the present invention
Part Nantural non-toxic evil, can refine the Granularity Structure of molding sand entirety so that molding sand overall particle size is more uniformly spread, casting process
The hole generated after high temperature contact is more preferably uniform.Bottom ash water suction dehydrating speed after especially ramie is burned is fast, in casting process
The moisture of generation it is quick scatter and disappear can play the role of it is extraordinary.
Further, the bottom ash after the bottom ash after the ramie is burned is burned using flax or jute is substituted.
Further, in step 1, the emollient component includes hydroxyl magnesium silicate and rutile type titanium white with 1：（0.2-
0.3）The component being mixed to form.
Further, in step 1, the emollient component be hydroxyl magnesium silicate, rutile type titanium white, feldspar in powder with
1：（0.2-0.3）：（0.05-0.08）The component being mixed to form.
Hydroxyl magnesium silicate be primarily present in it is a kind of be called in the mineral material of serpentine, serpentine belongs to 1：1 type, three or eight body layer
Shape hydrosilicate, ideal structural unit layer are made of oxyhydrogen magnesium flag with tetrahedral si-o film, are natural nano knots
Structure material.Relative to inorganic silicate, hydroxyl magnesium silicate useful can be effectively improved the surface contact properties energy of molding sand, especially with
After feldspar in powder, titanium dioxide match, the charging property of mixed powder, the very effective improvement molding sand sheet of ion exchangeable are utilized
The surface property of body.
Further, the hydroxyl magnesium silicate, rutile type titanium white, ranging from 20-30 μm of feldspar in powder raw material granularity.
Further, in step 1, the quartz sand is replaced using chrome ore, zirconium ore sand, nice foundry sand, forsterite sand
Generation.
Further, in step 3, furan resin hardener quality is the 55-70% of furane resins.Preferably, step 3
In, furan resin hardener quality is the 60-65% of furane resins.Preferably, in step 3, furan resin hardener quality is
The 62% of furane resins.The curing agent of furane resins is acidic materials, it is possible to use common commercially available curing agent, in of the invention
Used phosphoric acid can be effectively improved furan resin hardener curing reaction process with P-TOLUENE SULFO ACID 99's mixture as curing agent
The too big problem of middle thermal discharge, avoids bulk gas and moisture produced by vigorous reaction.
The present invention has the following advantages：
1, the molding sand prepared in the present invention is suitable for precision casting process, has high intensity and thermal stability, is resistant to
Larger outer force effect in 1500 DEG C or more of high temperature and casting process, it is sturdy and durable.It is particularly suitable for stainless steel, high temperature closes
The casting technique for the alloy material that the temperature such as gold are very high, pressure is larger.
2, the molding sand prepared in the present invention has good gas permeability, and gas extra in casting process can quickly be discharged
Body and heat make hot investment casting process efficiency higher.
3, the molding sand prepared in the present invention can be such that surface roughness reduce in casting process, form smooth table
Face.
4, the molding sand prepared in the present invention has good collapsibility after casting technique, in casting solidification rear profile
Sand is very easy to remove from casting.
Specific implementation mode
With reference to embodiment, the present invention will be described in detail.
Embodiment 1
The preparation method of the special molding sand of hot investment casting is as follows in the present embodiment：
Step 1 weighs raw material according to following component and mass fraction：
30 parts of quartz sand
Nitrogenize 15 parts of silica sand
5 parts of acid fiber by polylactic
3 parts of chitin fiber
4 parts of alumina powder
0.8 part of furane resins
10 parts of emollient component
2 parts of environmentally friendly component
Bottom ash, montmorillonite, zirconia powder after environmentally friendly component is glass bead, ramie is burned is with mass ratio 1：1：0.2：0.08 is mixed
Close the powder body material formed.
Emollient component is hydroxyl magnesium silicate, rutile type titanium white, feldspar in powder with 1：0.2：0.05 group being mixed to form
Point.Hydroxyl magnesium silicate, rutile type titanium white, feldspar in powder raw material granularity are 20 μm.
After above-mentioned raw materials being ground to respectively less than 5 μm, mixing, which is placed in planetary-type grinding machine, to be ground to particle size range and is
1-2 μm, molding sand ontology is made.
Step 2, by phosphoric acid and P-TOLUENE SULFO ACID 99 with molar ratio 1：1.2 are mixed, and furan resin hardener is made.
Step 3, molding sand use in preceding 30min, by the furan resin hardener in step 1 Sand ontology and step 2
Mixing is carried out, furan resin hardener quality is the 62% of furane resins, obtains required molding sand（It is now with the current）.
Embodiment 2
The preparation method of the special molding sand of hot investment casting is as follows in the present embodiment：
Step 1 weighs raw material according to following component and mass fraction：
40 parts of quartz sand
Nitrogenize 12 parts of silica sand
8 parts of acid fiber by polylactic
3 parts of chitin fiber
4 parts of alumina powder
1.5 parts of furane resins
12 parts of emollient component
2 parts of environmentally friendly component
Bottom ash, montmorillonite, zirconia powder after environmentally friendly component is glass bead, ramie is burned is with mass ratio 1：1.2：0.2：0.08
The powder body material being mixed to form.
Emollient component is hydroxyl magnesium silicate, rutile type titanium white, feldspar in powder with 1：0.3：0.08 group being mixed to form
Point.Hydroxyl magnesium silicate, rutile type titanium white, feldspar in powder raw material granularity are 20 μm.
After above-mentioned raw materials being ground to respectively less than 5 μm, mixing, which is placed in planetary-type grinding machine, to be ground to particle size range and is
1-2 μm, molding sand ontology is made.
Step 2, by phosphoric acid and P-TOLUENE SULFO ACID 99 with molar ratio 1：1.2 are mixed, and furan resin hardener is made.
Step 3, molding sand use in preceding 30min, by the furan resin hardener in step 1 Sand ontology and step 2
Mixing is carried out, furan resin hardener quality is the 62% of furane resins, obtains required molding sand（It is now with the current）.
Embodiment 3
The preparation method of the special molding sand of hot investment casting is as follows in the present embodiment：
Step 1 weighs raw material according to following component and mass fraction：
40 parts of quartz sand
Nitrogenize 15 parts of silica sand
7 parts of acid fiber by polylactic
4 parts of chitin fiber
4 parts of alumina powder
1.5 parts of furane resins
12 parts of emollient component
2 parts of environmentally friendly component
Bottom ash, montmorillonite, zirconia powder after environmentally friendly component is glass bead, flax is burned is with mass ratio 1：1.2：0.4：0.1
The powder body material being mixed to form.
Emollient component is hydroxyl magnesium silicate, rutile type titanium white, feldspar in powder with 1：0.3：0.08 group being mixed to form
Point.Hydroxyl magnesium silicate, rutile type titanium white, feldspar in powder raw material granularity are 20 μm.
After above-mentioned raw materials being ground to respectively less than 5 μm, mixing, which is placed in planetary-type grinding machine, to be ground to particle size range and is
1-2 μm, molding sand ontology is made.
Step 2, by phosphoric acid and P-TOLUENE SULFO ACID 99 with molar ratio 1：1.3 are mixed, and furan resin hardener is made.
Step 3, molding sand use in preceding 30min, by the furan resin hardener in step 1 Sand ontology and step 2
Mixing is carried out, furan resin hardener quality is the 62% of furane resins, obtains required molding sand（It is now with the current）.
Embodiment 4
The preparation method of the special molding sand of hot investment casting is as follows in the present embodiment：
Step 1 weighs raw material according to following component and mass fraction：
37 parts of chrome ore
Nitrogenize 15 parts of silica sand
5 parts of acid fiber by polylactic
4 parts of chitin fiber
4 parts of alumina powder
1.5 parts of furane resins
12 parts of emollient component
2 parts of environmentally friendly component
Bottom ash, montmorillonite, zirconia powder after environmentally friendly component is glass bead, flax is burned is with mass ratio 1：1.2：0.4：0.1
The powder body material being mixed to form.
Emollient component is hydroxyl magnesium silicate, rutile type titanium white, feldspar in powder with 1：0.3：0.08 group being mixed to form
Point.Hydroxyl magnesium silicate, rutile type titanium white, feldspar in powder raw material granularity are 20 μm.
After above-mentioned raw materials being ground to respectively less than 5 μm, mixing, which is placed in planetary-type grinding machine, to be ground to particle size range and is
1-2 μm, molding sand ontology is made.
Step 2, by phosphoric acid and P-TOLUENE SULFO ACID 99 with molar ratio 1：1.3 are mixed, and furan resin hardener is made.
Step 3, molding sand use in preceding 30min, by the furan resin hardener in step 1 Sand ontology and step 2
Mixing is carried out, furan resin hardener quality is the 62% of furane resins, obtains required molding sand（It is now with the current）.
Embodiment 5
The preparation method of the special molding sand of hot investment casting is as follows in the present embodiment：
Step 1 weighs raw material according to following component and mass fraction：
34 parts of zirconium ore sand
Nitrogenize 15 parts of silica sand
5 parts of acid fiber by polylactic
4 parts of chitin fiber
3.8 parts of alumina powder
1.5 parts of furane resins
12 parts of emollient component
1.9 parts of environmentally friendly component
Bottom ash, montmorillonite, zirconia powder after environmentally friendly component is glass bead, jute is burned is with mass ratio 1：1.2：0.4：0.1
The powder body material being mixed to form.
Emollient component is hydroxyl magnesium silicate, rutile type titanium white, feldspar in powder with 1：0.3：0.06 group being mixed to form
Point.Hydroxyl magnesium silicate, rutile type titanium white, feldspar in powder raw material granularity are 20 μm.
After above-mentioned raw materials being ground to respectively less than 5 μm, mixing, which is placed in planetary-type grinding machine, to be ground to particle size range and is
1-2 μm, molding sand ontology is made.
Step 2, by phosphoric acid and P-TOLUENE SULFO ACID 99 with molar ratio 1：1.3 are mixed, and furan resin hardener is made.
Step 3, molding sand use in preceding 30min, by the furan resin hardener in step 1 Sand ontology and step 2
Mixing is carried out, furan resin hardener quality is the 62% of furane resins, obtains required molding sand（It is now with the current）.
Embodiment 6
The preparation method of the special molding sand of hot investment casting is as follows in the present embodiment：
Step 1 weighs raw material according to following component and mass fraction：
33 parts of nice foundry sand
Nitrogenize 12 parts of silica sand
5 parts of acid fiber by polylactic
3 parts of chitin fiber
3.8 parts of alumina powder
1.5 parts of furane resins
12 parts of emollient component
2 parts of environmentally friendly component
Bottom ash, montmorillonite, zirconia powder after environmentally friendly component is glass bead, jute is burned is with mass ratio 1：1.2：0.4：0.09
The powder body material being mixed to form.
Emollient component is hydroxyl magnesium silicate, rutile type titanium white, feldspar in powder with 1：0.3：0.06 group being mixed to form
Point.Hydroxyl magnesium silicate, rutile type titanium white, feldspar in powder raw material granularity are 20 μm.
After above-mentioned raw materials being ground to respectively less than 5 μm, mixing, which is placed in planetary-type grinding machine, to be ground to particle size range and is
1-2 μm, molding sand ontology is made.
Step 2, by phosphoric acid and P-TOLUENE SULFO ACID 99 with molar ratio 1：1.2 are mixed, and furan resin hardener is made.
Step 3, molding sand use in preceding 30min, by the furan resin hardener in step 1 Sand ontology and step 2
Mixing is carried out, furan resin hardener quality is the 62% of furane resins, obtains required molding sand（It is now with the current）.
Embodiment 7
The preparation method of the special molding sand of hot investment casting is as follows in the present embodiment：
Step 1 weighs raw material according to following component and mass fraction：
30 parts of forsterite sand
Nitrogenize 15 parts of silica sand
5 parts of acid fiber by polylactic
3 parts of chitin fiber
3.8 parts of alumina powder
1.5 parts of furane resins
12 parts of emollient component
2 parts of environmentally friendly component
Bottom ash, montmorillonite, zirconia powder after environmentally friendly component is glass bead, jute is burned is with mass ratio 1：1.1：0.3：0.09
The powder body material being mixed to form.
Emollient component is hydroxyl magnesium silicate, rutile type titanium white, feldspar in powder with 1：0.3：0.06 group being mixed to form
Point.Hydroxyl magnesium silicate, rutile type titanium white, feldspar in powder raw material granularity are 20 μm.
After above-mentioned raw materials being ground to respectively less than 5 μm, mixing, which is placed in planetary-type grinding machine, to be ground to particle size range and is
1-2 μm, molding sand ontology is made.
Step 2, by phosphoric acid and P-TOLUENE SULFO ACID 99 with molar ratio 1：1.3 are mixed, and furan resin hardener is made.
Step 3, molding sand use in preceding 30min, by the furan resin hardener in step 1 Sand ontology and step 2
Mixing is carried out, furan resin hardener quality is the 62% of furane resins, obtains required molding sand（It is now with the current）.
The molding sand being prepared in the present embodiment is suitable for precision casting process, has high intensity and thermal stability, energy
The larger outer force effect being enough resistant in 1500 DEG C or more of high temperature and casting process, while there is good gas permeability, it can
Quickly gas and heat extra in discharge casting process, make hot investment casting process efficiency higher, the type prepared in the present invention
Sand can be such that surface roughness reduce in casting process, form smooth surface, and the molding sand prepared in the present invention
There is good collapsibility after casting technique, molding sand is very easy to remove from casting after casting solidification.
Finally, it should be noted that above example be only to illustrate the embodiment of the present invention technical solution rather than to its into
Row limitation, although the embodiment of the present invention is described in detail with reference to preferred embodiment, those skilled in the art
It should be understood that the technical solution of the embodiment of the present invention can be still modified or replaced equivalently, and these are changed or wait
The range of modified technical solution disengaging technical solution of the embodiment of the present invention cannot also be made with replacement.
Claims (10)
1. a kind of preparation method of the special molding sand of hot investment casting, it is characterised in that include the following steps：
Step 1 weighs raw material according to following component and mass fraction：
30-40 parts of quartz sand
Nitrogenize 10-15 parts of silica sand
5-8 parts of acid fiber by polylactic
3-4 parts of chitin fiber
2-4 parts of alumina powder
0.8-1.5 parts of furane resins
10-12 parts of emollient component
Environmentally friendly component 1-2 parts
After above-mentioned raw materials being ground to respectively less than 5 μm, it is 1-2 μ that mixing, which is placed in planetary-type grinding machine and is ground to particle size range,
Molding sand ontology is made in m；
Step 2, by phosphoric acid and P-TOLUENE SULFO ACID 99 with molar ratio 1：（1.2-1.3）It is mixed, furan resin hardener is made；
Step 3, molding sand carry out the furan resin hardener in step 1 Sand ontology and step 2 using in preceding 30min
Mixing obtains required molding sand.
2. the preparation method of the special molding sand of hot investment casting as described in claim 1, it is characterised in that：In step 1, the environmental protection
Bottom ash, montmorillonite, zirconia powder after component is glass bead, ramie is burned is with mass ratio 1：（1-1.2）：（0.2-0.4）：
（0.08-0.1）The powder body material being mixed to form.
3. the preparation method of the special molding sand of hot investment casting as claimed in claim 2, it is characterised in that：Bottom after the ramie burning
Bottom ash after ash is burned using flax or jute is substituted.
4. the preparation method of the special molding sand of hot investment casting as described in claim 1, it is characterised in that：In step 1, the lubrication
Component includes hydroxyl magnesium silicate and rutile type titanium white with 1：（0.2-0.3）The component being mixed to form.
5. the preparation method of the special molding sand of hot investment casting as described in claim 1, it is characterised in that：In step 1, the lubrication
Group is divided into hydroxyl magnesium silicate, rutile type titanium white, feldspar in powder with 1：（0.2-0.3）：（0.05-0.08）The group being mixed to form
Point.
6. the preparation method of the special molding sand of hot investment casting as described in claim 1, it is characterised in that：The hydroxyl magnesium silicate, gold
Ranging from 20-30 μm of red stone-type titanium dioxide, feldspar in powder raw material granularity.
7. the preparation method of the special molding sand of hot investment casting as described in claim 1, it is characterised in that：In step 1, the quartz
Sand is substituted using chrome ore, zirconium ore sand, nice foundry sand, forsterite sand.
8. the preparation method of the special molding sand of hot investment casting as described in claim 1, it is characterised in that：In step 3, furane resins
Curing agent quality is the 55-70% of furane resins.
9. the preparation method of the special molding sand of hot investment casting as described in claim 1, it is characterised in that：In step 3, furane resins
Curing agent quality is the 60-65% of furane resins.
10. the preparation method of the special molding sand of hot investment casting as described in claim 1, it is characterised in that：In step 3, furane resins
Curing agent quality is the 62% of furane resins.
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