CN102557665A - Method for producing high-strength holmium oxide-neodymium oxide ceramic - Google Patents
Method for producing high-strength holmium oxide-neodymium oxide ceramic Download PDFInfo
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- CN102557665A CN102557665A CN2010106208984A CN201010620898A CN102557665A CN 102557665 A CN102557665 A CN 102557665A CN 2010106208984 A CN2010106208984 A CN 2010106208984A CN 201010620898 A CN201010620898 A CN 201010620898A CN 102557665 A CN102557665 A CN 102557665A
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Abstract
The invention relates to the technical field of ceramic material, particularly to a method for producing high-performance silicon nitride (Si3N4) ceramic through pressureless sintering by using holmium oxide and neodymium oxide as additives. The silicon nitride ceramic comprises the following components in percentage by mass: 3-7% of holmium oxide, 5-8% of neodymium oxide, and 85-92% of silicon nitride. For overcoming the shortages in the prior art, the invention provides a method for producing high-performance silicon nitride ceramic through pressureless sintering by using holmium oxide and neodymium oxide as additives, and the method can be widely used for preparing components and parts in the fields of chemical industry, machinery, metallurgy, aerospace, etc.
Description
[technical field]
The present invention relates to a kind of technical field of ceramic material, specifically is the method for a kind of Holmium trioxide Neodymium trioxide as additive pressureless sintering production high-performance silicon nitride ceramics.
[background technology]
Silicon nitride ceramics has excellent mechanical behavior under high temperature, is acknowledged as one of the most rising high temperature resistant structure ceramics.Silicon nitride is as a kind of covalent linkage platform thing, and spread coefficient is little, does not have fusing point, decomposes ammonification and silicon about 2173K, is difficult to sintering.Common silicon nitride ceramics respond sintering and hot pressed sintering, the reaction sintering density is poor, poor mechanical property, though hot pressed sintering density is high, mechanical property is good, cost is higher, is difficult to scale operation.And pressureless sintering falls between, because silicon nitride ceramics is the covalent linkage compound, and the pressureless sintering difficulty, the density that improves the pressureless sintering silicon nitride ceramics becomes the research focus, adds rare earth oxide usually as sintering aid, like iridium oxide.But the cost of iridium oxide is higher, and is unfavorable for the application of silicon nitride.We select for use the Holmium trioxide Neodymium trioxide as sintered density and the mechanical property of additive to improve silicon nitride for this reason.
[summary of the invention]
The objective of the invention is to overcome the deficiency of prior art, the method for a kind of Holmium trioxide Neodymium trioxide as additive pressureless sintering production high-performance silicon nitride ceramics is provided.Working method of the present invention is simple, and cost is low, is prone to realize industrialization production; The silicon nitride ceramics that Holmium trioxide Neodymium trioxide of the present invention is produced as additive pressureless sintering has the density height, the characteristics that mechanical property is good.
The present invention realizes through following technical scheme:
The silicon nitride ceramics that Holmium trioxide Neodymium trioxide involved in the present invention is produced as additive pressureless sintering, component and mass percentage content are: Holmium trioxide 3%～7%, Neodymium trioxide 5%～8%, silicon nitride 85%～92%.
3～6 microns of described Holmium trioxide granularities, 5～7 microns of Neodymium trioxide granularities, 0.4～0.7 micron of silicon nitride granularity.
The silicon nitride ceramics method that Holmium trioxide Neodymium trioxide involved in the present invention is produced as additive pressureless sintering comprises the steps:
Step 1; Take by weighing Holmium trioxide Neodymium trioxide and silicon nitride ceramics powder respectively; In planetary ball mill, change mixing 2 hours with PM 270～330, dispersion medium is an absolute ethyl alcohol, subsequently 60 ℃ of oven dry; Time is 2～3 hours, Holmium trioxide Neodymium trioxide that obtains mixing and silicon nitride ceramics mixed powder;
Step 2 at 75～100Mpa forming under the pressure, forms biscuit with the mixed powder of step 1;
Step 3, with the biscuit in the step 2 in vacuum carbon tube furnace under nitrogen protection, under 1400～1550 ℃ of temperature, be incubated 12～18 hours.
Step 4 is taken out the silicon nitride ceramics that burns till in the step 3 detection volume density and mechanical property.
In the step 1, the weight percent of said Holmium trioxide is 3%～7%, and the weight percent of Neodymium trioxide is 5%～8%, and the weight percent of silicon nitride is 85%～92%.
In the step 1, α-Si in the said silicon nitride
3N
4Content is greater than 90%.
In the step 1, said Holmium trioxide Neodymium trioxide content is all greater than 98%.
In the step 3, said nitrogen gas pressure is 1～2 normal atmosphere.
In the step 4, said mechanical property is a folding strength.
Among the present invention, described Holmium trioxide Neodymium trioxide plays the effect of sintering aid, under 1400～1550 ℃ of high temperature sintering conditions, forms liquid phase, makes the silicon nitride ceramics densification.
The present invention has following beneficial effect: the silicon nitride ceramics compactness extent is high, and mechanical property is good, satisfies the actual needs that use.This preparation method is simple, and cost is low, is prone to realize industrialization production.
[embodiment]
Below in conjunction with embodiment the present invention is described further.Production technology of the present invention is to implement easily to this professional people.Present embodiment provided detailed embodiment and process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.The experimental technique of unreceipted actual conditions in the following example, usually according to normal condition, or the condition of advising according to manufacturer.
Embodiment
The Holmium trioxide Neodymium trioxide is Ganzhou Jiarun novel material ltd, and silicon nitride powder is the M11 powder that German Starck company produces.Take by weighing 3% Holmium trioxide, 5% Neodymium trioxide and 92% silicon nitride powder respectively according to weight percent.
Above-mentioned two kinds of powder (QM-3SP2 of Nanjing Univ. Instrument Factory type) in planetary ball mill are mixed, and rotating speed 300 changes 1.5 hours time.With the forming under the pressure of powder mix, biscuit (the flourish electric furnace ZT-40-20 of ltd of Shanghai occasion type) 1450 ℃ in vacuum carbon tube furnace is incubated 16 hours at 80Mpa.
The volume density of the silicon nitride ceramics that present embodiment obtains is 3.21g/cm
3, folding strength is 646Mpa.
Claims (7)
1. the silicon nitride ceramics produced as additive pressureless sintering of the related Holmium trioxide Neodymium trioxide of the production technique of HS Holmium trioxide Neodymium trioxide pottery; Component and mass percentage content are: Holmium trioxide 3%～7%; Neodymium trioxide 5%～8%, silicon nitride 85%～92%.3～6 microns of described Holmium trioxide granularities, 5～7 microns of Neodymium trioxide granularities, 0.4～0.7 micron of silicon nitride granularity.
2. the silicon nitride ceramics method that the related Holmium trioxide Neodymium trioxide of the production technique of HS Holmium trioxide Neodymium trioxide pottery according to claim 1 is produced as additive pressureless sintering comprises the steps:
Step 1; Take by weighing Holmium trioxide Neodymium trioxide and silicon nitride ceramics powder respectively; In planetary ball mill, change mixing 2 hours with PM 270～330, dispersion medium is an absolute ethyl alcohol, subsequently 60 ℃ of oven dry; Time is 2～3 hours, Holmium trioxide Neodymium trioxide that obtains mixing and silicon nitride ceramics mixed powder;
Step 2 at 75～100Mpa forming under the pressure, forms biscuit with the mixed powder of step 1;
Step 3, with the biscuit in the step 2 in vacuum carbon tube furnace under nitrogen protection, under 1400～1550 ℃ of temperature, be incubated 12～18 hours.
Step 4 is taken out the silicon nitride ceramics that burns till in the step 3 detection volume density and mechanical property.
3. the production technique of HS Holmium trioxide Neodymium trioxide pottery according to claim 2; The weight percent that it is characterized in that Holmium trioxide described in the step 1 is 3%～7%; The weight percent of Neodymium trioxide is 5%～8%, and the weight percent of silicon nitride is 85%～92%.
4. the production technique of HS Holmium trioxide Neodymium trioxide pottery according to claim 2 is characterized in that in the step 1 α-Si in the said silicon nitride
3N
4Content is greater than 90%.
5. the production technique of HS Holmium trioxide Neodymium trioxide pottery according to claim 2 is characterized in that in the step 1 that content is all greater than 98% in the said Holmium trioxide Neodymium trioxide.
6. the production technique of HS Holmium trioxide Neodymium trioxide pottery according to claim 2 is characterized in that in the step 3 that said nitrogen gas pressure is 1～2 normal atmosphere.
7. the production technique of HS Holmium trioxide Neodymium trioxide pottery according to claim 2 is characterized in that in the step 4 that said mechanical property is a folding strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106208984A CN102557665A (en) | 2010-12-29 | 2010-12-29 | Method for producing high-strength holmium oxide-neodymium oxide ceramic |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106208984A CN102557665A (en) | 2010-12-29 | 2010-12-29 | Method for producing high-strength holmium oxide-neodymium oxide ceramic |
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| Publication Number | Publication Date |
|---|---|
| CN102557665A true CN102557665A (en) | 2012-07-11 |
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|---|---|---|---|
| CN2010106208984A Pending CN102557665A (en) | 2010-12-29 | 2010-12-29 | Method for producing high-strength holmium oxide-neodymium oxide ceramic |
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|---|---|
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2010
- 2010-12-29 CN CN2010106208984A patent/CN102557665A/en active Pending
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Application publication date: 20120711 |