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Method for producing high compact complicated structure zircite part

A technology with complex structure and production method, applied in the field of powder metallurgy manufacturing, can solve the problems of difficult mechanical processing method, difficult to achieve high density, poor product performance, etc., achieve good mechanical performance, high yield, high hardness and fracture toughness Effect

Active Publication Date: 2009-06-10
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Zirconia parts with complex structures are usually obtained by machining and grinding, but there are many processes, low production efficiency, waste of raw materials, and energy consumption
Moreover, for some parts with complex shapes, such as steps, acute angles, blind holes and other structures, ordinary machining methods are more difficult, and the product performance is not good
The injection molding process can solve this problem very well and obtain zirconia parts with complex structures, but its density is generally in the range of 95-98%, and it is difficult to achieve high density

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation of binding agent: be by weight percentage polyethylene 5%, paraffin wax 70%, carnauba wax 5%, beeswax 10%, stearic acid 10% preparation, under the temperature of 160 ℃ in the mixer, mix 1 hour.

[0021] Mix zirconia powder and binder: prepare according to the volume ratio of zirconia powder and binder 58:42, mix in a mixer at 165°C for 2 hours.

[0022] Injection molding: put the above ingredients in an injection molding machine, and process it into a green body at 130°C, injection pressure 40MPa, and mold temperature 40°C.

[0023] Degreasing: put the blank into trichlorethylene and heat to 40°C, and degrease for 3 hours. Then put the blank in a degreasing furnace, heat it to 200°C at a rate of 10°C / min under the protection of hydrogen, keep it warm for 0.5 hours, continue to raise the temperature to 450°C, and keep it warm for 0.5 hours.

[0024] Sintering: first heat the degreased blank to 800°C for pre-sintering, then place it in a vacuum furnace an...

Embodiment 2

[0027] The preparation of binding agent: be by weight percentage polyethylene 10%, paraffin wax 60%, carnauba wax 10%, beeswax 15%, stearic acid 5% preparation, under the temperature of 180 ℃ in the mixer, mix 1 hour.

[0028] Mix zirconia powder and binder: prepare according to the volume ratio of zirconia powder and binder 55:45, mix in a mixer at 165°C for 2 hours.

[0029] Injection molding: put the above ingredients in an injection molding machine, and process it into a green body at 140°C, injection pressure 40MPa, and mold temperature 40°C.

[0030] Degreasing: put the blank into trichlorethylene and heat to 60°C, and degrease for 3 hours. Then put the blank in a degreasing furnace, heat it to 200°C at a rate of 10°C / min under the protection of hydrogen, keep it warm for 0.5 hours, continue to raise the temperature to 450°C, and keep it warm for 0.5 hours.

[0031] Sintering: first heat the degreased blank to 800°C for pre-sintering, then place it in a vacuum furnace a...

Embodiment 3

[0034] The preparation of binding agent: be by weight percentage polyethylene 20%, paraffin wax 55%, carnauba wax 10%, beeswax 5%, stearic acid 10% preparation, under the temperature of 160 ℃ in the mixer, mix 1 hour.

[0035] Mix zirconia powder and binder: prepare according to the volume ratio of zirconia powder and binder 50:50, mix in the mixer at 165°C for 2 hours.

[0036] Injection molding: put the above ingredients in an injection molding machine, and process it into a green body at 130°C, injection pressure 50MPa, and mold temperature 50°C.

[0037] Degreasing: put the blank into trichlorethylene and heat to 50°C, and degrease for 3 hours. Then put the blank in a degreasing furnace, heat it to 200°C at a rate of 10°C / min under the protection of hydrogen, keep it warm for 0.5 hours, continue to raise the temperature to 450°C, and keep it warm for 0.5 hours.

[0038] Sintering: first heat the degreased blank to 850°C for pre-sintering, then place it in a vacuum furnace...

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Abstract

The invention relates to a technique for manufacturing a zirconia component with high density and a complex structure, which comprises: zirconia powder and an adhesive are mixed, subjected to injection molding into blanks through an injection molder, and subjected to degreasing, sintering, hot isostatic pressing and enhanced sintering. The technique can manufacture the zirconia component with high density and the complex structure, does not need subsequent processing, and has high rate of finished products, high utilization rate of materials, high dimension precision, good surface smoothness and good mechanical property, and saves energy resources.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy manufacturing, in particular to a production process for manufacturing zirconia parts with high density and complex structure. Background technique [0002] Zirconia parts with complex structures are usually obtained by machining and grinding, but there are many processes, low production efficiency, waste of raw materials and energy consumption. Moreover, for some parts with complex shapes, such as parts with steps, acute angles, blind holes and other structures, ordinary machining methods are relatively difficult, and the product performance is not good. The injection molding process can solve this problem very well and obtain zirconia parts with complex structures, but its density is generally in the range of 95-98%, and it is difficult to achieve a high density effect. [0003] Chinese patent CN1808109 discloses a process method of adding zirconia into a binder for injection molding,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04B22F3/00
Inventor 向其军
Owner BYD CO LTD
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