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Method for manufacturing silicon carbide ceramic parts through power injection molding (PIM)

A technology of powder injection molding and silicon carbide ceramics, which is applied in the direction of ceramic molding machines and manufacturing tools, can solve the problems of high pre-sintering temperature, long degreasing time, and high requirements for heating equipment, so as to achieve fast degreasing rate, improve forming efficiency, reduce The effect of production costs

Inactive Publication Date: 2011-09-07
中硼科技(大连)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the technical problems of long degreasing time, high pre-sintering temperature, and high requirements for heating equipment in the existing method, and provides a method for powder injection molding silicon carbide ceramic parts

Method used

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Examples

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Effect test

specific Embodiment approach 1

[0012] Embodiment 1: The method for powder injection molding silicon carbide ceramic parts in this embodiment is carried out according to the following steps:

[0013] 1. Mix silicon carbide ceramic powder and oxide sintering aid to obtain mixed powder. The oxide sintering aid is alumina, yttrium oxide or a mixture of the two, and then put the mixed powder into a mixer and heat it to 160-190 ℃, keep warm for 0.5-1h, then add binder, knead for 2-6h, and then granulate on the extruder to obtain feed, in which silicon carbide ceramic powder accounts for 50%-60% of the feed volume, and the bonding The agent is composed of 50% to 80% of paraffin, 15% to 40% of polypropylene and 5% to 30% of stearic acid by weight percentage, and the sintering aid accounts for 0.1% to 15% of the mass of the mixed powder;

[0014] 2. Put the feed material in the injection molding machine, and then inject it into the mold under the conditions of the cylinder temperature of 180-210°C, the nozzle temper...

specific Embodiment approach 2

[0020] Embodiment 2: This embodiment differs from Embodiment 1 in that: in step 1, the silicon carbide ceramic powder accounts for 52% to 58% of the feed volume. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0021] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the silicon carbide ceramic powder accounts for 55% of the feed volume in Step 1. Other steps and parameters are the same as in the first embodiment.

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Abstract

The invention discloses a method for manufacturing silicon carbide ceramic parts through power injection molding (PIM), belonging to the field of manufacturing the silicon carbide ceramic products and aiming at solving the technical problems that the existing method is long in debinding time and high in pre-sintering temperature, and has high requirement for heating equipment, and the like. The method disclosed by the invention comprises the steps as follows: 1. adding silicon carbide ceramic powder and an oxide sintering additive in a mixer for heating, adding a binder for mixing, and pelleting to obtain a feed; 2. adding the feed in an injection-molding machine for injection molding to obtain injection blanks; 3. putting an injection-molded parts green body in an air furnace for thermal debinding and pre-sintering, and cooling along with the furnace to obtain blanks; and 4. insulating and sintering the blanks, thus obtaining the silicon carbide ceramic products. With the method, the debinding speed is fast, the parts blanks obtained at the lower pre-sintering temperature have enough strength so as to meet the transportation demand, the requirement of the process on the heating equipment is lowered, the molding efficiency is improved, and the production cost is lowered; and the method is applicable to pure carbonization and injection molding of silicon carbide taking an oxide as a sintering additive.

Description

technical field [0001] The invention belongs to the field of manufacturing silicon carbide ceramic products. Background technique [0002] Silicon carbide ceramics have excellent properties such as high temperature strength, strong oxidation resistance, good wear resistance, good thermal stability, small thermal expansion coefficient, high thermal conductivity, high hardness, thermal shock resistance and chemical corrosion resistance, and are widely used Used in precision bearings, seals, gas turbine rotors, nozzles, heat exchanger components and nuclear reactor materials. However, since silicon carbide ceramics are compounds with strong covalent bonds and have the characteristics of high strength and high hardness, it is difficult to prepare parts with complex shapes, which limits its further application. Therefore, if complex parts of silicon carbide ceramics can be prepared, the application range of silicon carbide ceramics can be greatly expanded. [0003] Powder injec...

Claims

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Application Information

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IPC IPC(8): B28B1/24
Inventor 卢振蒋少松张凯锋王长瑞
Owner 中硼科技(大连)有限公司
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