CN104072150A - Preparation process of silicon nitride ceramic material for water seal of water pump - Google Patents
Preparation process of silicon nitride ceramic material for water seal of water pump Download PDFInfo
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- CN104072150A CN104072150A CN201410261609.4A CN201410261609A CN104072150A CN 104072150 A CN104072150 A CN 104072150A CN 201410261609 A CN201410261609 A CN 201410261609A CN 104072150 A CN104072150 A CN 104072150A
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Abstract
The invention discloses a preparation process of a silicon nitride ceramic material for water seal of a water pump. The preparation process comprises the following steps: uniformly mixing silicon nitride, talcum powder, silicon carbide superfine powder, barium carbonate powder and absolute ethyl alcohol, adding zirconium dioxide and titanium dioxide, completely grinding, and implementing spray granulation in a spray tower to obtain a first material; calcining and oxidizing in a high-temperature furnace at 1000-1200 DEG C for 6-8h, and grinding in a vibrating grinder to obtain a second material which is 3000-4000 meshes in granularity; adding polyvinyl alcohol to the second material obtained, and pressurizing and molding in isostatic pressing equipment under pressure of 1.2-1.6 tons per square meter to obtain a third material; implementing heat-pressing treatment to obtain a fourth material, wherein calcining temperature of the high-temperature furnace is 1250-1350 DEG C, heat-pressing treatment duration is 7-8h and calcining pressure is 100,000-150,000kg/m<2>; and grinding, slicing and shaping to obtain the silicon nitride ceramic material for water seal of the water pump.
Description
Technical field
The present invention relates to silicon nitride ceramic material technical field, relate in particular to the preparation technology of a kind of water pump seal silicon nitride ceramic material.
Background technology
Silicon nitride ceramics is a kind of important structured material.It is a kind of superhard material, non-shrinking inorganic materials when sintering, and itself has oilness, and wear-resistant; Except hydrofluoric acid, it not with other inorganic acid reactions, resistance to corrosion is strong, anti-oxidant when high temperature, and it can also resist thermal shock, is heated to more than 1000 DEG C in air, sharply cooling sharply heating again, can be not cracked yet.Have the characteristic of excellence like this just because of silicon nitride ceramics, people usually utilize it to manufacture small gasoline engine water pump water seal stupalith.Along with the use range of silicon nitride ceramic material also day by day expands.Existing silicon nitride ceramic material more and more cannot meet the demand of high speed development, how to prepare a kind of density high, and intensity, wear resistance stupalith good and Good Heat-resistance become the current technical issues that need to address.
Summary of the invention
Based on the technical problem of background technology existence, the present invention proposes the preparation technology of a kind of water pump seal silicon nitride ceramic material, product weight is light, and density is high, and intensity is large, and wear resistance is good, resistance to elevated temperatures excellence, and preparation technology is simple, and cost is lower.
The preparation technology of a kind of water pump seal silicon nitride ceramic material that the present invention proposes, comprises the steps:
S1, take 70-85 part silicon nitride, 10-18 part talcum powder, 20-23 part silicon carbide ultrafine powder, 2-4 part barium carbonate powder and taking silicon carbide as benchmark 1.5-3wt% dehydrated alcohol mixes, then add 2-3 part zirconium dioxide, 0.5-1.5 part titanium dioxide after fully grinding, to send into mist projection granulating in spray tower and obtain the first material by weight;
S2, the first material is sent in High Temperature Furnaces Heating Apparatus to calcined oxide 6-8h at 1000-1200 DEG C, be then placed in vibrating ball mill and pulverize, obtaining granularity is 3000-4000 object the second material;
S3, in the second material obtaining, add the polyvinyl alcohol taking the second material as benchmark 0.8-1.3wt%, the pressure compression moulding that then adds every square centimeter of 1.2-1.6 ton through equal pressing equipment obtains 3 material, keeps vacuum in pressing process;
S4,3 material is put into High Temperature Furnaces Heating Apparatus and at N
2under atmosphere, hot-pressing processing obtains 4 materials, and High Temperature Furnaces Heating Apparatus calcining temperature is 1250-1350 DEG C, and the hot-pressing processing time is 7-8h, and calcining pressure is 100000-150000kg/m
2;
S5, by 4 materials through abrasive disc, section moulding obtain water pump seal silicon nitride ceramic material.
Preferably, described silicon carbide ultrafine powder comprises that particle diameter is that the silicon carbide ultrafine powder of 5-10 μ m accounts for 70-85%, and particle diameter is that the silicon carbide ultrafine powder of 15-30 μ m accounts for 10-20%, and particle diameter is that the silicon carbide ultrafine powder of 40-60 μ m accounts for 5-10%.
Preferably, in S1, the weight ratio of silicon nitride, talcum powder and silicon carbide ultrafine powder is 70-80:10-15:20.
Preferably, in S2, the first material is sent in High Temperature Furnaces Heating Apparatus to calcined oxide 7-8h at 1100-1150 DEG C.
Preferably, in S4, High Temperature Furnaces Heating Apparatus calcining temperature is 1300-1320 DEG C, and calcining pressure is 120000-135000kg/m
2.
In the present invention, silicon nitride differential granularity is little, almost without moulding deformation, compressibility and formability are poor, adopt polyvinyl alcohol as forming agent, add appropriate silicon carbide ultrafine powder to coordinate above-mentioned two kinds of raw materials, rationally control raw material particle size, make weight of the present invention, intensity is high, wear resisting property good, resistance to thermal shock, greatly extends work-ing life of the present invention; Due to zirconium dioxide chemical property torpescence, corrosion-resistant, specific refractory power is high, and fusing point is high, thermal expansivity is low, and titanium dioxide character torpescence can be used as again white pigment and porcelain glaze, coordinate and add zirconium dioxide, titanium dioxide as sintering aid, make even structure of the present invention, significantly improve toughening effect, and can significantly improve resistance to elevated temperatures of the present invention, can also make color and luster of the present invention good; In the preparation process of the first material, carry out abundant wet-milling, not only can make each component evenly broken, particle diameter homogenizing, and also each component is uniformly distributed.
Brief description of the drawings
Fig. 1 is preparation technology's schema of a kind of water pump seal silicon nitride ceramic material that proposes of the present invention.
Embodiment
As shown in Figure 1, Fig. 1 is preparation technology's schema of a kind of water pump seal silicon nitride ceramic material that proposes of the present invention.
With reference to Fig. 1, the preparation technology of a kind of water pump seal silicon nitride ceramic material that the present invention proposes, comprises the steps:
S1, take 70-85 part silicon nitride, 10-18 part talcum powder, 20-23 part silicon carbide ultrafine powder, 2-4 part barium carbonate powder and taking silicon carbide as benchmark 1.5-3wt% dehydrated alcohol mixes, then add 2-3 part zirconium dioxide, 0.5-1.5 part titanium dioxide after fully grinding, to send into mist projection granulating in spray tower and obtain the first material by weight;
S2, the first material is sent in High Temperature Furnaces Heating Apparatus to calcined oxide 6-8h at 1000-1200 DEG C, be then placed in vibrating ball mill and pulverize, obtaining granularity is 3000-4000 object the second material;
S3, in the second material obtaining, add the polyvinyl alcohol taking the second material as benchmark 0.8-1.3wt%, the pressure compression moulding that then adds every square centimeter of 1.2-1.6 ton through equal pressing equipment obtains 3 material, keeps vacuum in pressing process;
S4,3 material is put into High Temperature Furnaces Heating Apparatus and at N
2under atmosphere, hot-pressing processing obtains 4 materials, and High Temperature Furnaces Heating Apparatus calcining temperature is 1250-1350 DEG C, and the hot-pressing processing time is 7-8h, and calcining pressure is 100000-150000kg/m
2;
S5, by 4 materials through abrasive disc, section moulding obtain water pump seal silicon nitride ceramic material.
Embodiment 1
A preparation technology for silicon nitride ceramic material for water pump seal, comprises the steps:
S1, take 70 parts of silicon nitrides, 18 parts of talcum powder, 20 parts of silicon carbide ultrafine powders, 4 parts of barium carbonate powder and mix taking silicon carbide as benchmark 1.5wt% dehydrated alcohol by weight, then add 3 parts of zirconium dioxides, 0.5 part of titanium dioxide after fully grinding, to send into mist projection granulating in spray tower and obtain the first material, wherein silicon carbide ultrafine powder comprises that particle diameter is that the silicon carbide ultrafine powder of 5-10 μ m accounts for 85%, particle diameter is that the silicon carbide ultrafine powder of 15-30 μ m accounts for 10%, and particle diameter is that the silicon carbide ultrafine powder of 40-60 μ m accounts for 5%;
S2, the first material is sent in High Temperature Furnaces Heating Apparatus to calcined oxide 6h at 1200 DEG C, be then placed in vibrating ball mill and pulverize, obtaining granularity is 4000 object the second materials;
S3, in the second material obtaining, add the polyvinyl alcohol taking the second material as benchmark 0.8wt%, then add the pressure compression moulding of 1.6 tons every square centimeter through equal pressing equipment and obtain 3 material, in pressing process, keep vacuum;
S4,3 material is put into High Temperature Furnaces Heating Apparatus and at N
2under atmosphere, hot-pressing processing obtains 4 materials, and High Temperature Furnaces Heating Apparatus calcining temperature is 1250 DEG C, and the hot-pressing processing time is 8h, and calcining pressure is 100000kg/m
2;
S5, by 4 materials through abrasive disc, section moulding obtain water pump seal silicon nitride ceramic material.
Embodiment 2
A preparation technology for silicon nitride ceramic material for water pump seal, comprises the steps:
S1, take 85 parts of silicon nitrides, 10 parts of talcum powder, 23 parts of silicon carbide ultrafine powders, 2 parts of barium carbonate powder and mix taking silicon carbide as benchmark 3wt% dehydrated alcohol by weight, then add 2 parts of zirconium dioxides, 1.5 parts of titanium dioxide after fully grinding, to send into mist projection granulating in spray tower and obtain the first material, wherein silicon carbide ultrafine powder comprises that particle diameter is that the silicon carbide ultrafine powder of 5-10 μ m accounts for 70%, particle diameter is that the silicon carbide ultrafine powder of 15-30 μ m accounts for 20%, and particle diameter is that the silicon carbide ultrafine powder of 40-60 μ m accounts for 10%;
S2, the first material is sent in High Temperature Furnaces Heating Apparatus to calcined oxide 8h at 1000 DEG C, be then placed in vibrating ball mill and pulverize, obtaining granularity is 3000 object the second materials;
S3, in the second material obtaining, add the polyvinyl alcohol taking the second material as benchmark 1.3wt%, then add the pressure compression moulding of 1.2 tons every square centimeter through equal pressing equipment and obtain 3 material, in pressing process, keep vacuum;
S4,3 material is put into High Temperature Furnaces Heating Apparatus and at N
2under atmosphere, hot-pressing processing obtains 4 materials, and High Temperature Furnaces Heating Apparatus calcining temperature is 1350 DEG C, and the hot-pressing processing time is 7h, and calcining pressure is 150000kg/m
2;
S5, by 4 materials through abrasive disc, section moulding obtain water pump seal silicon nitride ceramic material.
Embodiment 3
A preparation technology for silicon nitride ceramic material for water pump seal, comprises the steps:
S1, take 80 parts of silicon nitrides, 15 parts of talcum powder, 20 parts of silicon carbide ultrafine powders, 3 parts of barium carbonate powder and mix taking silicon carbide as benchmark 2.5wt% dehydrated alcohol by weight, then add 2.8 parts of zirconium dioxides, 1.3 parts of titanium dioxide after fully grinding, to send into mist projection granulating in spray tower and obtain the first material, wherein silicon carbide ultrafine powder comprises that particle diameter is that the silicon carbide ultrafine powder of 5-10 μ m accounts for 80%, particle diameter is that the silicon carbide ultrafine powder of 15-30 μ m accounts for 10%, and particle diameter is that the silicon carbide ultrafine powder of 40-60 μ m accounts for 10%;
S2, the first material is sent in High Temperature Furnaces Heating Apparatus to calcined oxide 7h at 1100 DEG C, be then placed in vibrating ball mill and pulverize, obtaining granularity is 3500 object the second materials;
S3, in the second material obtaining, add the polyvinyl alcohol taking the second material as benchmark 1.2wt%, then add the pressure compression moulding of 1.5 tons every square centimeter through equal pressing equipment and obtain 3 material, in pressing process, keep vacuum;
S4,3 material is put into High Temperature Furnaces Heating Apparatus and at N
2under atmosphere, hot-pressing processing obtains 4 materials, and High Temperature Furnaces Heating Apparatus calcining temperature is 1320 DEG C, and the hot-pressing processing time is 7h, and calcining pressure is 120000kg/m
2;
S5, by 4 materials through abrasive disc, section moulding obtain water pump seal silicon nitride ceramic material.
The water pump seal silicon nitride ceramic material of preparing at embodiment 1-3, product uniform microstructure, density is not less than 97%, and intensity is 1000-1300MPa, and hardness is greater than 17GPa.
The above; it is only preferably embodiment of the present invention; but protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the present invention disclose technical scope in; be equal to replacement or changed according to technical scheme of the present invention and inventive concept thereof, within all should being encompassed in protection scope of the present invention.
Claims (5)
1. a preparation technology for silicon nitride ceramic material for water pump seal, is characterized in that, comprises the steps:
S1, take 70-85 part silicon nitride, 10-18 part talcum powder, 20-23 part silicon carbide ultrafine powder, 2-4 part barium carbonate powder and taking silicon carbide as benchmark 1.5-3wt% dehydrated alcohol mixes, then add 2-3 part zirconium dioxide, 0.5-1.5 part titanium dioxide after fully grinding, to send into mist projection granulating in spray tower and obtain the first material by weight;
S2, the first material is sent in High Temperature Furnaces Heating Apparatus to calcined oxide 6-8h at 1000-1200 DEG C, be then placed in vibrating ball mill and pulverize, obtaining granularity is 3000-4000 object the second material;
S3, in the second material obtaining, add the polyvinyl alcohol taking the second material as benchmark 0.8-1.3wt%, the pressure compression moulding that then adds every square centimeter of 1.2-1.6 ton through equal pressing equipment obtains 3 material, keeps vacuum in pressing process;
S4,3 material is put into High Temperature Furnaces Heating Apparatus and at N
2under atmosphere, hot-pressing processing obtains 4 materials, and High Temperature Furnaces Heating Apparatus calcining temperature is 1250-1350 DEG C, and the hot-pressing processing time is 7-8h, and calcining pressure is 100000-150000kg/m
2;
S5, by 4 materials through abrasive disc, section moulding obtain water pump seal silicon nitride ceramic material.
2. the preparation technology of silicon nitride ceramic material for water pump seal according to claim 1, it is characterized in that, described silicon carbide ultrafine powder comprises that particle diameter is that the silicon carbide ultrafine powder of 5-10 μ m accounts for 70-85%, particle diameter is that the silicon carbide ultrafine powder of 15-30 μ m accounts for 10-20%, and particle diameter is that the silicon carbide ultrafine powder of 40-60 μ m accounts for 5-10%.
3. the preparation technology with silicon nitride ceramic material according to the water pump seal described in any one in claim 1-2, is characterized in that, in S1, the weight ratio of silicon nitride, talcum powder and silicon carbide ultrafine powder is 70-80:10-15:20.
4. the preparation technology with silicon nitride ceramic material according to water pump seal described in any one in claim 1-3, is characterized in that, in S2, the first material is sent in High Temperature Furnaces Heating Apparatus to calcined oxide 7-8h at 1100-1150 DEG C.
5. the preparation technology with silicon nitride ceramic material according to the water pump seal described in any one in claim 1-4, is characterized in that, in S4, High Temperature Furnaces Heating Apparatus calcining temperature is 1300-1320 DEG C, and calcining pressure is 120000-135000kg/m
2.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106316406A (en) * | 2016-08-11 | 2017-01-11 | 安徽波浪岛游乐设备有限公司 | Preparation technology of anti-corrosive substrate for LED |
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| CN1537086A (en) * | 2001-07-24 | 2004-10-13 | ��ʽ���綫֥ | Wear-resistance silicon nitride member and method for manufacturing thereof |
| CN1856454A (en) * | 2003-09-25 | 2006-11-01 | 株式会社东芝 | Wear resistant member comprised of silicon nitride and process for producing the same |
| CN101100388A (en) * | 2007-07-17 | 2008-01-09 | 清华大学 | High heat conductivity silicon nitride ceramics material and preparation method thereof |
| CN101318822A (en) * | 2008-07-04 | 2008-12-10 | 冷水江市明玉陶瓷工具有限责任公司 | Silicon nitride composite ceramics heater |
| CN102875153A (en) * | 2012-09-27 | 2013-01-16 | 宁波伏尔肯机械密封件制造有限公司 | Spray drying granulation method of silicon nitride ceramic powder used for mechanical sealing |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1537086A (en) * | 2001-07-24 | 2004-10-13 | ��ʽ���綫֥ | Wear-resistance silicon nitride member and method for manufacturing thereof |
| CN1856454A (en) * | 2003-09-25 | 2006-11-01 | 株式会社东芝 | Wear resistant member comprised of silicon nitride and process for producing the same |
| CN101100388A (en) * | 2007-07-17 | 2008-01-09 | 清华大学 | High heat conductivity silicon nitride ceramics material and preparation method thereof |
| CN101318822A (en) * | 2008-07-04 | 2008-12-10 | 冷水江市明玉陶瓷工具有限责任公司 | Silicon nitride composite ceramics heater |
| CN102875153A (en) * | 2012-09-27 | 2013-01-16 | 宁波伏尔肯机械密封件制造有限公司 | Spray drying granulation method of silicon nitride ceramic powder used for mechanical sealing |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106316406A (en) * | 2016-08-11 | 2017-01-11 | 安徽波浪岛游乐设备有限公司 | Preparation technology of anti-corrosive substrate for LED |
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