Research and Application of Process Technology Phosphate Ceramic Slurry Yang Xiaoping, Li Huanchen (Department of Materials and Chemical Engineering, Liaoning Institute of Technology, Jinzhou 121001, Liaoning, China) The best ratio, and examined the various properties of ceramic slurry, the production of precision castings application. The results show that the ceramic slurry has excellent performance, low cost and wide application value.
The particle group should be based on the size of the casting and it should be different. This test uses the ishinf test. Brief introduction: Yang Pinlan, male, mandarin, green pond, high-chromium corundum, its particle composition, see Table 1, Table 1, high chromium corundum particles, make precision castings, Casting or gypsum-based methods are often used. Ceramic-type investment castings can be used only for the production of small and medium-sized castings. It is difficult to manufacture large-scale precision castings, and castings with high surface roughness are required. It is often difficult to achieve a satisfactory effect on the surface of the plaster casting. The surface quality can reach good technical requirements. However, due to the low strength of the mold, it is only suitable for low-melting-point alloys. Its use also has certain limitations. The ceramic type made of silicon silicate as a binder, due to its complicated manufacturing process and high manufacturing cost, its use is also subject to certain limitations. The characteristics of the above several casting processes are summarized to achieve dimensional accuracy and surface roughness. With better technical requirements, while simplifying the production process and reducing the production cost, we studied and tested a ceramic slurry with phosphate as a binder. , for ceramic-type production of precision casting We have used orthogonal test method to determine the best formula of phosphate ceramic slurry, and carried out production verification 1 test material high-chromium corundum ceramic slurry refractory aggregate used by ferroalloy factory production Chromium iron by-product of chromium iron slag, broken grinding, made of different sizes of particles because of its Afc3 content of more than 85%, Ce3 content of more than 10%, so called high-chromium corundum its melting point of 1 68g/cm3, Mohs hardness At 9, the coefficient of thermal expansion is about half that of quartz and the thermal conductivity is twice that of quartz. The high-chromium corundum is a neutral material that is not easily chemically reacted with non-ferrous alloys and steel alloy fluids, and has a high degree of refractoriness, can withstand the impact of high-temperature metal liquids, and at the same time has a low cost, and is only 1/3 of the zircon sand powder. The other components of the slurry are selected from the group consisting of a phosphate, a high-quality bentonite as the suspending agent, a magnesium oxide powder as the hardener, and a solvent as water. In addition, some admixtures are added to improve the solidification characteristics, such as a retarder, as required. Lignosulphonic acid calcium dispersant sodium hexametaphosphate, defoamer n-octanol, etc. 2 Test methods for the performance of ceramic slurries Suspension using static method, measuring the 100 ml cylinder without static curing agent for 24 hours in the ceramic slurry Precipitated volume percentage The initial setting time was measured with a SYS-A type sand surface hardness tester. From the time when the curing agent was added until the measured surface hardness was 10, the time used for this process was the initial setting time.
Wet Strength We use ceramic slurry to make 8-shaped sample, after final coagulation, place it for 2 hours, measure the final setting time with a lever type universal strength tester and measure it with SYS-A type sand surface hardness tester, from the time of adding the curing agent to the hardness of the tested surface. For 90 hours, the time used for this process is the final setting time.
The fluidity was measured by the flowability measurement of the fluid sand. The dry strength was prepared using a ceramic slurry. After the final coagulation, it was placed for 2 hours, then placed in an oven at 100C for 2 hours, and then taken out after tapping.
The degree of other fireproof m is determined by the accuracy of iCPublishingelrightsreserved. The high-temperature strength is measured on the universal strength tester. The dried 8 character sample is used for 1.5h. After the removal, the ceramic slurry is measured on a lever type universal strength tester. Other performance tests refer to C. Determination of Suspension without Magnesium Oxide The preparation process of ceramic slurry is: high chrome corundum + bentonite wet mixing for 30s wet mixing 60s The test results show that, with the increase of the amount of added phosphate, the wet strength of phosphate is improved. Obviously, lowering the suspensibility has less obvious effect on the solidification time, and reduces the suspensibility. The effect on the solidification time is less obvious. Magnesium oxide has a greater influence on the solidification time and also has an enhanced wet strength. Bentonite improves the suspension of the ceramic slurry and improves the wet strength, but has little effect on the solidification time. For the wet strength, the best level combination is A3BG for the initial setting time, according to our long operation test, it is believed that 8~10min For the best initial setting time, we set it here to be 9min, so its best level combination is also A3BG's indicator for suspension performance. Its best combination is AB. According to our test, the suspension performance reaches 85%~95%. The filling conditions can be met, and the quality of ceramics is stable. For this reason, we selected Asft and therefore determined that A3B2C2 is the best level combination, which is the best ceramic slurry formulation.
In addition, for the determination of the suspension index, since it was measured without adding magnesium oxide, in order to more accurately reflect the suspensibility of the ceramic slurry, at the time of measurement, we added the same mass of the same mass as the magnesium oxide 3.2 ceramics The other properties of the slurry are determined by formulating ceramic slurries in the best formula to determine whether the other properties of the ceramic slurries can meet the requirements of the ceramic casting. The fluidity of the ceramic slurry reflects the filling ability of the ceramic slurry. The ceramic slurry has good fluidity and strong filling ability. It can completely fill the ceramic slurry developed in this article with some small and complex cavities. The fluidity is 80%~90%, and it can fully satisfy various cavity types. The filling needs, for the upper limit of the small complex cavity, the lower limit for the less complex cavity, so that not only fully filling, but also to ensure the wet strength of the mold.
The permeability of the breathable ceramic slurry has a great relationship with the amount of fine powder in the refractory aggregate. When the amount of ceramic fine powder reaches more than 60% of the refractory aggregate, the permeability of the ceramic type will be close to Zero, this is not conducive to the filling of molten metal This paper has studied the relationship between the amount of chrome corundum powder in the refractory aggregate and the permeability of the liquid, and in order to ensure that the small and medium castings have a high surface chrome corundum powder Influence of the addition amount of cast-type fire-resistant aggregate on the air permeability of the mold. Influence of linear shrinkage Shrinkage of the ceramic slurry has a certain influence on the size of the casting, while the shrinkage of the ceramic slurry and the refractory bone in the slurry The content of the material is closely related to the content of this article on the relationship between the content of refractory aggregates and the shrinkage rate of the experimental study, according to the test results according to the size of the castings and dimensional accuracy requirements, the content of refractory aggregates in 60% more appropriate refractory aggregate content Too much affects the fluidity of the ceramic slurry. If the content of the refractory aggregate is too small, the linear shrinkage of the ceramic mold changes greatly.
The physical and chemical properties are formulated according to the best formula, its viscosity is 40s~60s, and the density is 1. Good high temperature crack resistance 3.3 The production verification uses this ceramic slurry in the flow block and the forming die is the key part of the liquid extrusion die. The establishment of temperature gradient is a necessary condition for realizing liquid extrusion. The chemical composition of ZA43 alloy for testing (mass fraction, 6Cu, 0i02Mg is used to melt the liquid ZA43 alloy structure of the liquid extrusion die into the mold, on a 1000kN hydraulic press Squeeze out the round bar cast Wei Wei use the line cut to cut the workpiece along the axial direction, grinding and polishing to observe the macrostructure.Prepare the metallographic sample from different parts of the workpiece body and cross-section to observe the microstructure. RESULTS AND ANALYSIS 2.1 Macroscopic deformation of liquid extruded ZA43 alloys is characterized by liquid extrusion. Macro longitudinal photographs of the ZA43 alloy rod parts are shown in the figure by the arrow in the center and the sidewall flow lines. During the extrusion process, the flow velocity of the metal in the middle part is fast and the velocity in the peripheral part is slow, which is mainly due to the obstruction of the side wall friction force and the result of the use of the solidification of the first solidified metal in the entire extrusion. During the periphery of the metal solid fraction is always greater than the intermediate portion of the metal in the solid fraction,
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