Microwave plasma method for sintering calcium, phosphor bioceramic

A technology of microwave plasma and bioceramics, applied in prosthesis, medical science and other directions, can solve the problems of large energy loss, high sintering temperature, long sintering time, etc., and achieve fast speed, low sintering temperature, and small grain size. Effect

Inactive Publication Date: 2003-07-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many disadvantages in traditional muffle furnace sintering: (1) The sintering time is long, and the whole process generally takes more than ten hours; (2) The sintering temperature is high; (3) The energy loss is large
However, there has been no report on the use of microwave plasma to sinter calcium-phosphorous bioceramics

Method used

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  • Microwave plasma method for sintering calcium, phosphor bioceramic
  • Microwave plasma method for sintering calcium, phosphor bioceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put the formed and degummed hydroxyapatite sample on the abutment of the sintering chamber, pour in cooling water, vacuumize, turn on the microwave generator, and control the CO 2 +O 2 (CO 2 :O 2 =30∶70) The mixed gas flow rate is 100mL / min, the microwave frequency used is 2.45GHz, increase the power to 350W at a speed of 15W / min, gradually adjust the vacuum degree to 8000Pa, keep warm for 20min, and then use a speed of 30W / min Reduce the power, turn off the flame, cool naturally to room temperature and discharge. The linear shrinkage of the obtained sample is 15.8%, and the grain size is 210nm.

Embodiment 2

[0024] Put the formed and degummed tricalcium phosphate sample on the abutment of the sintering chamber, pour in cooling water, vacuumize, turn on the microwave generator, and control O 2 The flow rate is 150mL / min, the microwave frequency used is 2.45GHz, increase the power to 300W at a speed of 10W / min, gradually adjust the vacuum degree to 2000Pa, keep warm for 10min, and then reduce the power at a speed of 30W / min until the flame is turned off. Cool to room temperature and discharge, the linear shrinkage of the obtained sample is 14.8%, and the grain size is 195nm.

Embodiment 3

[0026] Put the formed and degummed hydroxyapatite / tricalcium phosphate (hydroxyapatite: tricalcium phosphate = 60:40) dual-phase sample on the abutment of the sintering chamber, pour in cooling water, vacuumize, and turn on the microwave generator, control O 2 +N 2 (O 2 :N 2 =30∶70) The mixed gas flow rate is 300mL / min, the microwave frequency used is 2.45GHz, increase the power to 300W at a speed of 8W / min, gradually adjust the vacuum degree to 5000Pa, keep warm for 10min, and then decrease at a speed of 30W / min Power, until the material is turned off, the linear shrinkage of the obtained sample is 16.0%, and the grain size is 235nm.

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Abstract

A microwave plasma sinter method for preparing Ca-P bioceramics includes such steps as die pressing or foam shaping of Ca-P bioceramics powder, removing adhesive at 400 deg.C, sintering at 600-1100 deg.C for 5-45 min in the working gas (O2, N2 and/or CO2) in microwave plasma sintering cavity, and slowly cooling. Its advantages are high speed, high bioactivity and mechanical performance of product.

Description

1. Technical field [0001] The field of the invention relates to a microwave plasma sintering method of calcium phosphorus bioceramics. 2. Background technology [0002] The sintering method of calcium phosphorus bioceramics is currently commonly used muffle furnace sintering method. The procedure is to mold the calcium phosphorus bioceramic powder into a green body by molding or foaming, and then heat it at about 1100°C for 1~ 4 hours. There are many disadvantages in traditional muffle furnace sintering: (1) The sintering time is long, and the whole process generally takes more than ten hours; (2) The sintering temperature is high; (3) The energy loss is large. Long-term high-temperature sintering will lead to coarser grains of the final material, and poorer biological activity and mechanical properties. In the third issue of "China Science A Newspaper" in 1991, "Comparison of Microstructural Characteristics of Synthetic Chloroapatite and Human Tooth Enamel Crystal", Feng ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L27/10A61L27/12C04B35/64
Inventor 冉均国芶立季金苟王方瑚
Owner SICHUAN UNIV
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