CN201382191Y - Polycrystalline diamond composite valve seat - Google Patents
Polycrystalline diamond composite valve seat Download PDFInfo
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- CN201382191Y CN201382191Y CN200920068651U CN200920068651U CN201382191Y CN 201382191 Y CN201382191 Y CN 201382191Y CN 200920068651 U CN200920068651 U CN 200920068651U CN 200920068651 U CN200920068651 U CN 200920068651U CN 201382191 Y CN201382191 Y CN 201382191Y
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- polycrystalline diamond
- valve seat
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- valve
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Abstract
The utility model relates to a polycrystalline diamond composite valve seat. The valve seat comprises a cylindrical hard alloy basal body, wherein a polycrystalline diamond layer is arranged at the inner wall of the basal body or polycrystalline diamond layers are arranged at the inner wall and one end surface of the basal body; a hole or holes is/are longitudinally arranged in the center of the polycrystalline diamond layer(s); the mouth of the hole takes the arc shape, and a seal pair is formed by the mouth of the hole and a valve core seal cone; and a stainless steel valve sleeve is embedded at the outer wall of the hard alloy basal body. Compared with the prior art, the polycrystalline diamond composite (PDC) pressure-reducing valve seat produced by the method of the utility model has the advantages of abrasion resistance, washout resistance and long service life, and solves the bottleneck problem of restricting the long-period steady running of the production device more importantly.
Description
Technical field
The utility model relates to a kind of polycrystalline diamond complex valve seat, the preparation method of wear-resistant, the anti-impact erosion valve base of pressure reducing valve composite material that be specifically related to high temperature such as oil, chemical industry, Coal Chemical Industry, High Pressure Difference, contains that working condition such as solid particle uses down.
Background technique
Polycrystalline diamond complex (Polycrystalline Diamond Composite, PDC) or polycrystalline diamond (Polycrystalline Diamond, PCD) as a kind of superhard, wear resistant composite material is touched in drill bit and cutting tool, the wire drawing in the machining field of petroleum drilling and mining, geologic prospecting, be used widely on trimmer and other the various wear resistant appliances.Early stage PDC product mainly be with the Compax of U.S. G.E company in-situ sintering and Britain DeBeers company adopt intermediary excessively the Sydite of layer be representative, its manufacture method is both to have good toughness and certain degree of hardness, simultaneously with the PCD material some compatible Hardmetal materials being arranged again is substrate, or with diadust high pressure high temperature next time the property sintering in the cemented carbide substrate; Or utilize the cementing metal fusion of intermediary transition layer to be diffused into PCD layer and carbide surface, by the effect of pressure PCD and cemented carbide are bonded together securely.Yet, up to the present do not find as yet the manufacturing technology of this super-hard compound material is applied to chemical field, particularly patent and the reported in literature on the critical equipment of operation under high temperature, High Pressure Difference, the high solid granule content working condition.
Viewpoint from materials science, for cobalt spreading type PDC composite material, the both sides, interface of tungsten-cobalt carbide layer and PCD layer all belong to the biphase ceramics material, and two layers of material all be with metallic cobalt as the bonding phase, successful liquid-phase sintering depends primarily on the mutual wetting degree of solid-liquid two-phase.According to the combination principle of metal-ceramic,, just should have good cementation as long as the two has medium wetness degree.Therefore, utilize high hardness, high wear resistance, high elastic modulus and the shock resistance of PCD, be prepared into valve base of pressure reducing valve, thereby realize improving the purpose of service life of equipment.
U.S.'s Oak Ridge National Laboratory (ORNL) is once to the four tame pilot-plants such as EDS technological test factory of the Baytown of the H-Coal technological test factory of the Ashland of the SRC tooling of the Wilsonville of the Fort Lewis in continent, Washington and Alabama State, the Kentucky State, Texas, in high temperature, High Pressure Difference, contain the reduction valve that uses under the working conditions such as solid particle medium and made comprehensive analysis, its seat material is materials such as K-703, the K-602 of 316 stainless steels and Kennametal company and K-701 Tungsten carbite, and the valve life-span only is several hours to 1000 hours.
Spool, the valve seat of U.S. FLOWSERER modulating valve are the whole tungsten carbide material, in high temperature, High Pressure Difference, contain only use tens hours under the solid particle material process conditions after, spool heavy wear occurs and lost efficacy.
The product LV2201 reduction valve that Japan YAMATAKE company provides, valve seat adopts the polycrystalline diamond structure, has only used more than 400 hour under above-mentioned process conditions, and brittle fracture appears in valve seat.
Summary of the invention
The purpose of this utility model is exactly to provide a kind of can contain use under the solid particle working condition wear-resistant, anti-impact erosion, long-life polycrystalline diamond complex valve seat at high temperature, High Pressure Difference, height in order to overcome the defective that above-mentioned prior art exists.
The purpose of this utility model can be achieved through the following technical solutions: a kind of polycrystalline diamond complex valve seat, it is characterized in that, this valve seat comprises matrix cylindraceous, matrix inwall or matrix inwall and an end face are provided with polycrystalline diamond layer, this polycrystalline diamond layer central longitudinal is porose to offering, the oral area in hole is circular arc, and constitutes sealing pair with the seal spool awl, and the outer wall of described matrix is inlaid with the stainless steel valve pocket.
Described matrix internal diameter is Φ 8～10mm, and outside diameter of cylinder is Φ 14～16mm.
Described matrix is tungsten (W)-cobalt (Co) series hard alloy, comprises YG20, YG11 or YG15.
The thickness of described polycrystalline diamond layer is 0.5～3mm.
Described polycrystalline diamond layer is that the diadust and the sintering agent of the different complete in crystal formation of granularity formed, and the grain size proportion of diadust is W20: W10: W5=(70～80): (25～15): 5.
The grain size proportion of described diadust is W20: W10: W5=75: 20: 5.
Described sintering agent is the mixture of Fe powder and Si powder, and its content is 1～5wt% of diamond dust.
The aperture in described hole is Φ 3～8mm.
The oral area radius of arc R in described hole is 1～3mm.
Described stainless steel valve pocket is a 316L stainless steel valve pocket, adopts interference to inlay and is arranged on outside the matrix.
The utility model is a matrix with tungsten (W)-cobalt (Co) series hard alloy, on its matrix or matrix and an end face, fill the diamond dust that is mixed with an amount of sintering agent, form polycrystalline diamond complex (PDC) by high pressure-temperature in-situ sintering diamond dust, and then make the valve seat of polycrystalline diamond complex material by special processing technology.Compared with prior art, the utility model polycrystalline diamond complex (PDC) valve base of pressure reducing valve, wear-resistant, anti-impact is lost, the long lifetime, and what is more important has solved the bottleneck problem of restriction process units long-period stable operation.Valve base of pressure reducing valve of the present utility model, applicable to the front and back pressure reduction of 450 ℃ of high temperature, valve reach as high as 19.9MPa, solid content reaches working conditions such as 48wt%.Adopt PDC composite material valve base of pressure reducing valve of the present utility model under above-mentioned working condition, can prolong the working life of this reduction valve greatly.
Compared with prior art, the utlity model has following advantage:
1, the polycrystalline diamond complex valve seat can improve the hardness and wear-resistant, the anti-erosion property of material.
2, polycrystalline diamond layer adding sintering agent Fe can activate the diamond particles surface, promotes the combination between diamond-diamond particles, the misgrowth of containment crystal grain, the PDC material of acquisition even compact, the wear resistance of raising sintering body.
3, polycrystalline diamond layer adds sintering agent Si and can form excessive phase in sintering body, avoids because of cemented carbide and diamond crack at the two the difference and the cooling back of expansion coefficient between the two at the interface reduction valve seat working life.
4, the advantage that back stress discharges step by step that can realize being heated between stainless steel-cemented carbide-polycrystalline diamond three, avoid valve body and combination interface cracking, overcome in stainless steel-polycrystalline diamond mode of structure because of the two expansion coefficient difference is big the deficiency that easily cracks.
Description of drawings
Fig. 1 is tungsten of the present utility model (W)-cobalt (Co) series hard alloy base structure schematic representation;
Fig. 2 is a PDC sintering body cylindrical structural schematic representation of the present utility model;
Fig. 3 reaches the structural representation that the PCD layer is arranged at end face of PDC for PDC sintering body of the present utility model is cylindrical;
Fig. 4 is a PDC sintered body structure schematic representation of the present utility model;
Fig. 5 has the structural representation of PCD layer for PDC sintering body end face of the present utility model;
Fig. 6 is the valve seat construction schematic representation that PDC sintering body of the present utility model and the interference of stainless steel valve pocket are inlayed;
Fig. 7 has the valve seat construction schematic representation that PCD layer and the interference of stainless steel valve pocket are inlayed for PDC sintering body end face of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
As shown in Figure 6, a kind of polycrystalline diamond complex valve seat, this valve seat comprises matrix 1 cylindraceous, the matrix internal diameter is Φ 10mm, outside diameter of cylinder is Φ 16mm, described matrix is tungsten (W)-cobalt (Co) series hard alloy YG20, the matrix inwall is provided with polycrystalline diamond layer 2, its thickness is 2mm, polycrystalline diamond layer 2 central longitudinal are to offering the hole that the aperture is Φ 6mm, and oral area is circular arc, and radius of arc R is 2mm, radius of arc and seal spool awl constitute sealing pair, and the outer wall of described matrix 1 is with stainless steel valve pocket 3.
Diadust that described polycrystalline diamond layer 2 is the different complete in crystal formation of granularity and sintering agent are formed, and diamond dust is the diadust of complete in crystal formation, and its grain size proportion is W20: W10: W5=75: 20: 5.At first the raw material diadust is weighed before the sintering, and carry out application of vacuum, be adsorbed on the levitation gas on diadust surface with removal, the vacuum purification treatment conditions are: (1～3) * 10
-3Pa, 600 ℃, vacuum purification 1h.Purifying good raw material diadust adding sintering agent 1～5wt%Fe powder and Si powder, puddle evenly, the cemented carbide YG20 that is processed into cylindrical structure is packed in the metal molybdenum cup, tungsten (W)-cobalt (Co) series hard alloy base structure as shown in Figure 1, with the diamond mixture of packing in the cylinder 1, then, be assembled in the pyrophyllite cavity.With the pyrophyllite cavity that assembles, be seated on the homemade cubic apparatus high pressure high temperature equipment, adopt the sintering process that heats up behind the 6.0GPa that boosts earlier, when temperature is raised to 1450 ℃, sintering 15min stops the quick cooling of hot release and makes product, PDC sintering body (as shown in Figure 2).Product is through figuring of surface, polishing, and in PCD layer 2 central longitudinal to perforate, constitute high temperature, the high-pressure medium circulation road (as shown in Figure 4) carried from reduction valve side direction inlet ductwork.PDC valve seat overcoat is the 316L stainless steel, adopts the interference mosaic mode to realize the PDC sintering body valve base of pressure reducing valve of final products (as shown in Figure 6) PDC sintering body and the 316L stainless steel valve pocket 3 that processes.
As shown in Figure 7, a kind of polycrystalline diamond complex valve seat, this valve seat comprises matrix 1 cylindraceous, the matrix internal diameter is Φ 10mm, outside diameter of cylinder is Φ 16mm, described matrix is tungsten (W)-cobalt (Co) series hard alloy YG20, matrix inwall and an end face are provided with polycrystalline diamond layer 2, its inner wall thickness is 2mm, and end surface thickness is 0.5mm, and polycrystalline diamond layer 2 central longitudinal are to offering the hole that the aperture is Φ 6mm, oral area is circular arc, radius of arc R is 2mm, and radius of arc and seal spool awl constitute sealing pair, and the outer wall of described matrix 1 is inlaid with stainless steel valve pocket 3.
Diamond dust is the diadust of complete in crystal formation, and its grain size proportion is W20: W10: W5=75: 20: 5.At first the raw material diadust is weighed before the sintering, and carry out application of vacuum, be adsorbed on the levitation gas on diadust surface with removal, the vacuum purification treatment conditions are: (1～3) * 10
-3Pa, 600 ℃, vacuum purification 1h.In purifying good raw material diadust, add sintering agent 1～5wt%Fe powder and Si powder, puddle evenly, the cemented carbide YG20 that will be processed into cylindrical structure earlier packs in the metal molybdenum cup, again with in the cylinder 1 and end face diamond mixture of packing into, then, be assembled in the pyrophyllite cavity.With the pyrophyllite cavity that assembles, be seated on the homemade cubic apparatus high pressure high temperature equipment, the sintering process that adopts (6.0GPa) back of boosting earlier to heat up, when temperature was raised to 1450 ℃, sintering 15min stopped the quick cooling of hot release and makes product (as shown in Figure 3).Product is through figuring of surface, polishing, and in PCD layer 2 central longitudinal to perforate, the aperture is Φ 6mm, constitutes high temperature, the high-pressure medium circulation road (as shown in Figure 5) carried from reduction valve side direction inlet ductwork.PDC valve seat overcoat is a 316L stainless steel 3, adopt the interference mosaic mode to realize the PDC sintering body valve base of pressure reducing valve of final products (as shown in Figure 7) the PDC sintering body and the 316L stainless steel valve pocket that process, PDC valve seat oral area is circular arc, radius of arc R is 2mm, and radius of arc and seal spool awl constitute sealing pair.
As shown in Figure 3, cylindrical and at end face of PDC the purpose of PCD layer architecture to be arranged be to guarantee that valve seat end face and high temperature, high pressure, height from reduction valve side direction inlet ductwork contain solid particle medium stream contact position the thick polycrystalline diamond layer of 0.5～2mm is arranged at the PDC sintering body, improve valve seat end face wear resistance.
The valve base of pressure reducing valve of PDC Composite Preparation as shown in Figure 7, applicable to the front and back pressure reduction of 450 ℃ of high temperature, valve reach as high as 19.9MPa, solid content reaches working conditions such as 48wt%.The valve base of pressure reducing valve that adopts PDC composite material of the present utility model can prolong the working life of this reduction valve greatly under above-mentioned working condition.
A kind of polycrystalline diamond complex valve seat is a matrix with tungsten (W)-cobalt (Co) series hard alloy YG11, fills the diamond dust that is mixed with 1wt% sintering agent Fe powder and Si powder on its matrix.The purpose that adds sintering agent is the difference that takes into full account cemented carbide and diamond expansion coefficient between the two, the liquid phase that reduces as much as possible in the PCD sintering process exists, the misgrowth of containment crystal grain, and avoid cooling back to crack at the interface at the two reduces valve seat working life.Diamond dust is the diadust of complete in crystal formation, its grain size proportion is W20: W10: W5=70: 25: 5, at first the good raw material diadust of proportioning is weighed before the sintering, put into the vacuum purification device, carry out purified treatment, be adsorbed on the levitation gas on diadust surface with removal, the condition that vacuum purification is handled is: pressure 5 * 10
-3580 ℃ of Pa, temperature purify 0.8 hour.In purifying good raw material diadust, add sintering agent, puddle evenly, it is Φ 8mm that matrix is processed into internal diameter, external diameter is the cylindric of Φ 14mm, matrix cemented carbide YG11 (referring to Fig. 1) cylinder that processes is packed in the metal molybdenum cup, in the cemented carbide cylinder or in the tube and end face diamond mixture of packing into, then, be assembled in the pyrophyllite cavity.Again with the pyrophyllite cavity that assembles, be seated on the homemade cubic apparatus high pressure high temperature equipment, adopt the 5.8Gpa that boosts earlier, the sintering process of Sheng Wening again, when temperature is raised to 1500 ℃, sintering 10min stops hot release and cools off fast, makes the PDC sintering body (referring to Fig. 2, Fig. 3) that in-situ sintering forms.The PDC sintering body that again in-situ sintering is formed, through figuring of surface, polishing, and in PCD layer central longitudinal to perforate, constitute high temperature, the high-pressure medium circulation road carried from reduction valve side direction inlet ductwork.
Embodiment 4
A kind of polycrystalline diamond complex valve seat, this valve seat is a matrix with cemented carbide YG15, be processed into this matrix cylindric, its internal diameter is Φ 10mm, and outside diameter of cylinder is Φ 16mm, and the raw material diamond dust that proportioning is good is weighed, put into the vacuum purification device, carry out vacuum purification and handle, remove the levitation gas that is adsorbed on the diamond dust surface, the condition that vacuum purification is handled is: pressure 1.33 * 10
-3650 ℃ of Pa, temperature purify 1.2 hours.Diamond dust is the diadust of complete in crystal formation, its grain size proportion is W20: W10: W5=80: 15: 5, in purifying good raw material diamond dust, add 5wt% sintering agent Fe powder and Si powder, puddle and evenly obtain the diamond mixture, again the matrix cemented carbide cylinder that processes is packed in the metal molybdenum cup, in the cemented carbide cylinder and end face diamond mixture of packing into, be assembled in then in the pyrophyllite cavity, with the pyrophyllite cavity that assembles, be seated on the cubic apparatus high pressure high temperature equipment again, adopt the 6.2Gpa that boosts earlier, the sintering process of Sheng Wening again, when temperature was raised to 1500 ℃, sintering 10min stopped hot release and cools off fast, make the polycrystalline diamond complex sintering body that in-situ sintering forms, again with this sintering body, through figuring of surface, polish, and promptly get product to perforate in the polycrystalline diamond layer central longitudinal.
Claims (7)
1. polycrystalline diamond complex valve seat, it is characterized in that, this valve seat comprises matrix cylindraceous, matrix inwall or matrix inwall and an end face are provided with polycrystalline diamond layer, this polycrystalline diamond layer central longitudinal is porose to offering, the oral area in hole is circular arc, and constitutes sealing pair with the seal spool awl, and the outer wall of described matrix is inlaid with the stainless steel valve pocket.
2. a kind of polycrystalline diamond complex valve seat according to claim 1 is characterized in that described matrix internal diameter is Φ 8～10mm, and outside diameter of cylinder is Φ 14～16mm.
3. a kind of polycrystalline diamond complex valve seat according to claim 1 is characterized in that, described matrix is tungsten (W)-cobalt (Co) series hard alloy, comprises YG20, YG11 or YG15.
4. a kind of polycrystalline diamond complex valve seat according to claim 1 is characterized in that the thickness of described polycrystalline diamond layer is 0.5～3mm.
5. a kind of polycrystalline diamond complex valve seat according to claim 1 is characterized in that the aperture in described hole is Φ 3～8mm.
6. a kind of polycrystalline diamond complex valve seat according to claim 1 is characterized in that, the oral area radius of arc R in described hole is 1～3mm.
7. a kind of polycrystalline diamond complex valve seat according to claim 1 is characterized in that, described stainless steel valve pocket is a 316L stainless steel valve pocket, adopts interference to inlay and is arranged on outside the matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920068651U CN201382191Y (en) | 2009-03-10 | 2009-03-10 | Polycrystalline diamond composite valve seat |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920068651U CN201382191Y (en) | 2009-03-10 | 2009-03-10 | Polycrystalline diamond composite valve seat |
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| CN201382191Y true CN201382191Y (en) | 2010-01-13 |
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| CN200920068651U Expired - Fee Related CN201382191Y (en) | 2009-03-10 | 2009-03-10 | Polycrystalline diamond composite valve seat |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018031661A1 (en) * | 2016-08-10 | 2018-02-15 | Cameron International Corporation | Diamond sintered sampling relief valve |
| WO2023059923A1 (en) * | 2021-10-08 | 2023-04-13 | Sensia Llc | Polychristalline diamond sampling valve |
-
2009
- 2009-03-10 CN CN200920068651U patent/CN201382191Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018031661A1 (en) * | 2016-08-10 | 2018-02-15 | Cameron International Corporation | Diamond sintered sampling relief valve |
| WO2023059923A1 (en) * | 2021-10-08 | 2023-04-13 | Sensia Llc | Polychristalline diamond sampling valve |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100113 Termination date: 20130310 |