A preparation method of calcium silicate bioceramics using non-metallic borides as sintering aids
A technology of non-metal borides and sintering aids, applied in the direction of prosthesis, medical science, etc., can solve the problems of large grain size, poor mechanical properties, limited application, etc. Hard sintering effect
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[0024] The invention provides a method for preparing calcium silicate bioceramics using non-metallic borides as sintering aids. It is prepared by using non-metallic boride as sintering aid, calcium silicate as the main phase, adding binder, mixing uniformly by ball milling, forming and sintering at normal pressure. By using non-metallic borides as sintering aids, boron oxide with a lower melting point is generated by low-temperature oxidation, and a liquid phase is formed between ceramic particles within the sintering temperature range to promote the densification of ceramic particles, and prepare a low-porosity, mechanically Calcium silicate ceramic material with excellent properties and suitable for biobearing applications.
[0025] As non-metallic borides, including but not limited to boron nitride, boron oxide, boric acid, etc., preferably boron nitride, the oxidation product of boron nitride is boron oxide, boron oxide is an important part of biological glass, which meets...
Embodiment 1
[0036] Firstly, 0.5 g of hexagonal boron nitride powder and 49.5 g of calcium silicate powder were weighed, 90 g of absolute ethanol was added, and 7.14 g of polyvinyl butyral with a solution concentration of 7 wt % was added. Planetary ball milling for 3 hours to obtain a uniformly dispersed mixed powder; then dry at 50-80°C for 3 hours and sieve to obtain a powder mixture; then dry press and isostatically press the prepared powder A test strip with a length, width and height of 3×4×40 mm was obtained. The test strip was put into an alumina crucible for sintering under normal pressure, and kept at 1000°C for 3 hours to obtain calcium silicate ceramics with 1% boron nitride addition.
[0037] The microscopic appearance of the calcium silicate bioceramic that present embodiment makes is as follows figure 1 shown. The physical and mechanical properties of the ceramics are shown in Table 1. Among them, the flexural strength is tested by three-point bending method (Instron-5566...
Embodiment 2
[0041] First, 1.5 g of hexagonal boron nitride powder and 48.5 g of calcium silicate powder were weighed, 90 g of absolute ethanol was added, and 7.14 g of polyvinyl butyral with a solution concentration of 7 wt % was added. Planetary ball milling for 3 hours to obtain a uniformly dispersed mixed powder; then dry at 50-80°C for 3 hours and sieve to obtain a powder mixture; then dry press and isostatically press the prepared powder A test strip with a length, width and height of 34×40 mm was obtained. Put the test strip into an alumina crucible for sintering under normal pressure: heat at 900° C. for 3 hours to obtain calcium silicate ceramics with 3% boron nitride addition.
[0042] The microscopic appearance of the calcium silicate ceramics that present embodiment makes is as follows image 3 shown. The physical and mechanical properties of the ceramics are shown in Table 1. It can be seen from the figure that as the sintering temperature decreases and the amount of boron ...
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Abstract
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