A nanowire self-reinforced porous silicon nitride ceramic and its preparation method
A technology of silicon nitride ceramics and nanowires, which is applied to ceramic products, other household appliances, household appliances, etc., and can solve the problems of non-uniform pores in porous silicon nitride ceramics, reduced utilization of silicon powder, and uneven distribution of pores. , to achieve the effects of increasing nitrogen concentration, promoting contact, and high utilization of raw materials
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Embodiment 1
[0028] A nanowire self-reinforced porous silicon nitride ceramic and a preparation method thereof. The steps of the preparation method described in this embodiment are:
[0029] Step 1. Using 70-76wt% silicon powder, 5-10wt% catalyst and 14-20wt% nitrogen source as raw materials, add 20-26wt% deionized water of the raw materials, and stir for 30-60min to obtain a ceramic slurry material.
[0030] Step 2. Add foam made of 10-16wt% of the raw material foaming agent to the ceramic slurry under stirring conditions. After adding the foam, continue stirring for 30-60 minutes to obtain a ceramic foam slurry; The mass ratio of foaming agent and deionized water in the foam is 1: (10-13).
[0031] Step 3: Pour the ceramic foam slurry into a mould, and let it stand at room temperature and in a nitrogen environment for 1-24 hours; then dry it at 60-110°C for 12-24 hours, and demould to obtain a ceramic body.
[0032] Step 4: Place the ceramic body in a vacuum tube furnace, and in a nit...
Embodiment 2
[0038] A nanowire self-reinforced porous silicon nitride ceramic and a preparation method thereof. The present embodiment is the same as embodiment 1 except blowing agent.
[0039] The blowing agent described in this embodiment is a mixture of alkylphenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether.
[0040] The nanowire self-reinforced porous silicon nitride ceramic prepared in this example is tested: the flexural strength is 20-26 MPa; the compressive strength is 50-60 MPa.
Embodiment 3
[0042] A nanowire self-reinforced porous silicon nitride ceramic and a preparation method thereof. The present embodiment is except blowing agent, all the other are the same as embodiment 1.
[0043] The foaming agent described in this embodiment is a mixture of fatty alcohol polyoxyethylene ether, sodium hydroxymethylcellulose and hydroxyethylcellulose.
[0044] The nanowire self-reinforced porous silicon nitride ceramic prepared in this example is tested: the flexural strength is 20-26 MPa; the compressive strength is 50-60 MPa.
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