CN112974794B - 粉末冶金气门导管 - Google Patents
粉末冶金气门导管 Download PDFInfo
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- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229910052802 copper Inorganic materials 0.000 claims abstract description 22
- 239000010949 copper Substances 0.000 claims abstract description 22
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000009792 diffusion process Methods 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 17
- 238000005245 sintering Methods 0.000 claims abstract description 16
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims abstract description 14
- 239000012188 paraffin wax Substances 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 12
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000007747 plating Methods 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 9
- 229910001562 pearlite Inorganic materials 0.000 claims description 9
- 229910001563 bainite Inorganic materials 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 7
- 229910052721 tungsten Inorganic materials 0.000 claims description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 229910052750 molybdenum Inorganic materials 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 17
- 239000011159 matrix material Substances 0.000 abstract description 9
- 229910001567 cementite Inorganic materials 0.000 abstract description 5
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 abstract description 5
- 229910002804 graphite Inorganic materials 0.000 abstract description 4
- 239000010439 graphite Substances 0.000 abstract description 4
- 239000002245 particle Substances 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract 1
- 238000002791 soaking Methods 0.000 abstract 1
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- QIJNJJZPYXGIQM-UHFFFAOYSA-N 1lambda4,2lambda4-dimolybdacyclopropa-1,2,3-triene Chemical compound [Mo]=C=[Mo] QIJNJJZPYXGIQM-UHFFFAOYSA-N 0.000 description 1
- 229910039444 MoC Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910021386 carbon form Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/102—Metallic powder coated with organic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/103—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
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- B22—CASTING; POWDER METALLURGY
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F3/26—Impregnating
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- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F5/106—Tube or ring forms
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
Abstract
本发明公开了一种粉末冶金气门导管及制备方法,其原料以质量分数计包括:石墨粉0.6‑0.9%,镀铜石墨粉1.5‑4.0%,WC 0.5‑5%,二硫化钼0.8‑1.5%,石蜡0.5‑1.0%,扩散粘结铁粉10‑30%,其余为雾化铁粉。制备方法包括混粉、成型、烧结和浸油。本发明通过混入1.5‑4.0%镀铜石墨粉来作为增碳剂,可以有效地控制基体含碳量和游离石墨粒径,从而减少甚至消除网状渗碳体,提高了材料压溃强度等性能。加入的碳化钨微粉,可有效地提高材料的耐磨性能。
Description
技术领域
本发明涉及气门导管及制备,具体涉及一种粉末冶金气门导管及制备方法。
背景技术
气门导管是汽车发动机气门的导向装置,对气门起导向作用,并使气门杆上的热量经气门导管传给汽缸盖。
现有利用粉末冶金技术制造气门导管存在基体中渗入的碳不易控制,易出现因控制不当而造成网状渗碳体,造成气门导管的压溃性能偏低,现有技术中为避免过量的碳渗入基体,采用的石墨粒度偏大和烧结温度偏低,会造成对基体强度的减弱作用也增大,造成气门导管耐磨性能不足。
发明内容
发明目的:本发明的目的是提供一种粉末冶金气门导管及制备方法,解决现有技术存在的渗入碳不易控制,其造成气门导管的压溃性能偏低,及珠光体基体存在的耐磨性能不足的技术问题。
技术方案:本发明所述的粉末冶金气门导管,其原料以质量分数计包括:石墨粉0.6-0.9%,镀铜石墨粉1.5-4.0%,WC 0.5-5%,二硫化钼0.8-1.5%,石蜡0.5-1.0%,扩散粘结铁粉10-30%,其余为雾化铁粉。
其中,所述镀铜石墨粉的铜含量为50%±10%,所述扩散粘结铁粉的铜含量为10-25%。
其化学成分包括C1.2—3.2%,Cu2.0—6.0%,S 0.2—0.8%,Mo 0.4%—1.0%,W:≤5%。
其金相组织为贝氏体+珠光体+铁素体组织,硫化物、游离铜均匀分布,碳化物≤5%,10-25%的孔隙率。
本发明所述的粉末冶金气门导管,其制备方法包括以下步骤:
(1)先将原料中一半的雾化铁粉和扩散粘结粉混合,依次加入一半的石墨粉、镀铜石墨粉、碳化钨、二硫化钼和石蜡,再依次加入剩余的雾化铁粉和扩散粘结粉,最后依次加入剩余的石墨粉、镀铜石墨粉、碳化钨、二硫化钼和石蜡,混制30-60min,混合均匀同时保证混合好的成品粉流动性能≤45s/50g,松装密度2.7-3.5g/cm3;
(2)使用压机将混合的原料装入模具中压制成所需形状,然后进行脱蜡、烧结和冷却,脱蜡温度为650-800℃,烧结的温度为1085-1120℃,烧结的保护气氛为90%N2+10%H2,脱蜡时间:30-60min;烧结时间30-60min;
(3)将烧结好的气门导管放入真空浸油机中浸油,即完成粉末冶金气门导管的制备。
有益效果:本发明使用镀铜石石墨粉进行烧结,可通过调节烧结温度来保证石墨处于游离状态,避免过量的碳扩散进入基体,从而达到控制渗碳体生成量,避免过量网状渗碳体生成的目的,提高了导管的压溃强度。同时,在材料中加入适量的碳化钨作为硬质相,改善了基体的耐磨性能,从而延长气门导管的使用寿命。
具体实施方式
下面结合实施例对本发明进行进一步说明。
实施例1
粉末冶金气门导管按照质量百分比计,包括以下组分:石墨粉:0.65%,镀铜石墨粉:1.5%,二硫化钼:1.0%,WC:3-5%,石蜡:0.6%,扩散粘结粉10-30%,余量为雾化铁粉,镀铜石墨粉的铜含量为50%±10%,扩散粘结铁粉的铜含量为10-25%。化学成分包括C1.2-1.6%,Cu 3-5%,S 0.4-0.8%,Mo 0.4%—0.8%,W:≤5%)。气门导管材料的金相组织为贝氏体+珠光体+铁素体组织,硫化物、游离铜均匀分布,碳化物≤5%,10-25%的孔隙率,材料性能为:密度6.5-7.0g/cm3;压溃强度:650-1000MPa;硬度:65-100HRB。
实施例2
粉末冶金气门导管按照质量百分比计,包括以下组分:石墨粉:0.7%,镀铜石墨粉:2%,二硫化钼:1.0%,WC:3-5%,石蜡:0.6%,扩散粘结粉:10-30%,余量为雾化铁粉。化学成分包括C1.5—2.0%,Cu 3.0—5.0%,S 0.4—0.8%,Mo 0.4%—0.8%,W:≤5%)。,气门导管材料的金相组织为贝氏体+珠光体+铁素体组织,硫化物、游离铜均匀分布,碳化物≤5%,10-25%的孔隙率,材料性能为:密度6.5-7.0g/cm3;压溃强度:600-900MPa;硬度:65-100HRB。
实施例3
粉末冶金气门导管按照质量百分比计,包括以下组分:石墨粉:0.8%,镀铜石墨粉:2.5%,二硫化钼:1.0%,WC:3-5%,石蜡:0.6%,扩散粘结粉:10-30%,余量为雾化铁粉。化学成分包括C1.8—2.5%,Cu3—5.0%,S 0.4—0.8%,Mo 0.4%—0.8%,W:≤5%)。气门导管材料的金相组织为贝氏体+珠光体+铁素体组织,硫化物、游离铜均匀分布,碳化物≤5%,10-25%的孔隙率,材料性能为:密度6.5-7.0g/cm3;压溃强度:550-900MPa;硬度:65-100HRB。
实施例4
粉末冶金气门导管按照质量百分比计,包括以下组分:石墨粉:0.6%,镀铜石墨粉:3.5%,二硫化钼:1.0%,WC:4-5%,石蜡:0.6%,扩散粘结粉:10-30%,余量为雾化铁粉。化学成分包括C 2.0—3.0%,Cu3.0—6.0%,S 0.4—0.8%,Mo 0.4%—1.0%,W:≤5%)。气门导管材料的金相组织为贝氏体+珠光体+铁素体组织,硫化物、游离铜均匀分布,碳化物≤5%,10-25%的孔隙率,材料性能为:密度6.5-7.0g/cm3;压溃强度:550-900MPa;硬度:65-100HRB。
实施例5
粉末冶金气门导管按照质量百分比计,包括以下组分:石墨粉:0.8%,镀铜石墨粉:1.5%,二硫化钼:1.0%,WC:3-4%,石蜡:0.6%,扩散粘结粉:10-30%,余量为雾化铁粉。化学成分包括C1.2—1.8%,Cu 3.0—6.0%,S 0.4—0.8%,Mo 0.4%—1.0%,W:≤5%)。气门导管材料的金相组织为贝氏体+珠光体+铁素体组织,硫化物、游离铜均匀分布,碳化物≤5%,10-25%的孔隙率,材料性能为:密度6.5-7.0g/cm3;压溃强度:600-900MPa;硬度:65-100HRB。
制备实施例1-5的气门导管的方法包括以下步骤:
先将原料中一半的雾化铁粉和扩散粘结粉混合,依次加入一半的石墨粉、镀铜石墨粉、碳化钨、二硫化钼和石蜡,再依次加入剩余的雾化铁粉和扩散粘结粉,最后依次加入剩余的石墨粉、镀铜石墨粉、碳化钨、二硫化钼和石蜡,混制30-60min,混合均匀同时保证混合好的成品粉流动性能≤45s/50g,松装密度2.7-3.5g/cm3;
(2)使用压机将混合的原料装入模具中压制成所需形状,然后进行脱蜡、烧结和冷却,脱蜡温度为650-800℃,烧结的温度为1085-1120℃,烧结的保护气氛为90%N2+10%H2,脱蜡时间:30-60min;烧结时间30-60min;
(3)将烧结好的气门导管放入真空浸油机中浸油,即完成粉末冶金气门导管的制备。
本发明通过混入1.5-4.0%镀铜石墨粉来,可以有效地控制基体含碳量和游离石墨粒径,从而减少甚至消除网状渗碳体,提高了材料压溃强度等性能,加入的碳化钨微粉,可有效地提高材料的耐磨性能,本发明中化学成分中碳含量大于1%,主要是利用游离石墨作为润滑相,加入Cu主要是促进珠光体组织生成,加钼则除了促进珠光体生成外,还有促进贝氏体组织生成的作用,其主要目的均是强化材料强度,增加耐磨性。加入S,则利用S与Mo、Cu、Fe生成硫化物润滑相。同时,Mo还与碳生成钼的碳化物,从而形成硬质相,W主要是通过碳化钨加入的,在基体中,碳化钨作为硬质相存在,主要用于增加耐磨性能。本发明的贝氏体+珠光体的金相组织有较好的综合性能,硫化物主要是作为固体润滑相,提高耐磨性能;碳化物含量太多时,材料的韧性下降,脆性增加,故需控制在5%以下;10-25%的孔隙率则是保证粉末冶金材料贮油和润滑的主要功能。
Claims (3)
1.一种粉末冶金气门导管,其特征在于,其原料以质量分数计包括:石墨粉 0.6-0.9%,镀铜石墨粉1.5-4.0%,碳化钨0.5-5%,二硫化钼0.8-1.5%,石蜡 0.5-1.0%,扩散粘结铁粉10-30%,其余为雾化铁粉,其化学成分包括C 1.2-3.2%,Cu 2.0-6.0%,S 0.2-0.8%,Mo0.4%-1.0%,W≤5%,
所述气门导管的制备方法包括以下步骤:
(1)先将原料中一半的雾化铁粉和扩散粘结粉混合,依次加入一半的石墨粉、镀铜石墨粉、碳化钨、二硫化钼和石蜡,再依次加入剩余的雾化铁粉和扩散粘结粉,最后依次加入剩余的石墨粉、镀铜石墨粉、碳化钨、二硫化钼和石蜡,混制30-60min,混合均匀同时保证混合好的成品粉流动性能≤45s/50g,松装密度2.7-3.5g/cm3;
(2)使用压机将混合的原料装入模具中压制成所需形状,然后进行脱蜡、烧结和冷却,脱蜡温度为650-800℃,烧结的温度为1085-1120℃,烧结的保护气氛为90%N2+10%H2,脱蜡时间:30-60min;烧结时间30-60min;
(3)将烧结好的气门导管放入真空浸油机中浸油,即完成粉末冶金气门导管的制备。
2.根据权利要求1所述的粉末冶金气门导管,其特征在于,所述镀铜石墨粉的铜含量为50%±10%,所述扩散粘结铁粉的铜含量为10-25%。
3.根据权利要求1所述的粉末冶金气门导管,其特征在于,其金相组织为贝氏体+珠光体+铁素体组织,硫化物、游离铜均匀分布,碳化物≤5%,10-25%的孔隙率。
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