CN1635174A - Preparing method for bit basis material containing rare earth - Google Patents
Preparing method for bit basis material containing rare earth Download PDFInfo
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- CN1635174A CN1635174A CN 200310116074 CN200310116074A CN1635174A CN 1635174 A CN1635174 A CN 1635174A CN 200310116074 CN200310116074 CN 200310116074 CN 200310116074 A CN200310116074 A CN 200310116074A CN 1635174 A CN1635174 A CN 1635174A
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Abstract
The invention provides a method for preparing high strength cemented carbide basis material used for PDC drilling bit using cheap rare earth additive and common vacuum sintering technique. By adding rare-earth element in minute quantity into the raw material, and adopting common vacuum sintering technique, the shock resistance, wear resistance and fracture toughness property of the prepared PCD drilling bit basis material are all improved compared with common cemented carbide, comparing favourably with the performances of low voltage isostatic pressingsintering products but less cost of PDC drilling bit basis material.
Description
Technical field
The present invention relates to a kind of PDC bit matrix preparation methods, particularly a kind of PDC bit matrix preparation methods that contains rare earth.
Background technology
Generally speaking, petroleum drilling is had relatively high expectations with the body material of PDC (Polycrystalline diamond composites, polycrystalline diamond matrix material) drill bit.At first require material to have higher impact-resistance; Next has certain anti-rock erosion is wear resistance; Require the material property high conformity simultaneously.
At present, quality preferably PDC bit matrix material adopt the Wimet of low pressure isostatic pressing technology sintering preparation more.This method agglomerating alloy density height, thus alloy property and life-span are increased substantially, but because the agglomerating plant costliness causes cost of alloy to increase.
Summary of the invention
The purpose of this invention is to provide a kind of cheap rare earth addition and conventional vacuum sintering technology of adopting and prepare the method for PDC drill bit with the high strength cemented carbide body material.
For achieving the above object, the present invention takes following technical scheme:
A kind of PDC bit matrix preparation methods that contains rare earth, its step is as follows:
(A) with WC powder, cobalt powder and rare earth addition mix, wherein cobalt powder accounts for 13～16 weight %, and rare earth addition accounts for 0.4～0.8 weight % of cobalt powder, and all the other are the WC powder;
(B) with above-mentioned batching through wet-milling, the precipitation, drying, the screening, mixed powder;
(C) rubber being mixed with concentration is 8～13% rubber gasoline solution;
(D) the gained rubber gasoline solution is mixed mixed powder, the add-on that makes rubber is 0.8～1.1 weight % of powder mix, and behind drying, screening, the system material, compression moulding gets pressed compact;
(E) the gained pressed compact is come unstuck under hydrogen shield;
(F) the above-mentioned pressed compact that has come unstuck is carried out vacuum sintering.
Rare earth addition is preferably yttrium oxide described in the described step (A), and other rare earth addition also can.
60～80 eye mesh screens are preferably used in screening described in the described step (B).
During vacuum sintering described in the described step (F), heat up at a slow speed during low temperature, be rapidly heated during high temperature.
During vacuum sintering described in the described step (F), under 400～450 ℃, 600～650 ℃, 800～850 ℃ and 1050～1200 ℃, be incubated 0.5 hour respectively; Finish maintenance vacuum tightness＞250Pa to sintering for 1200 ℃.
Utilize the aluminium sesquioxide particle that alloy and graphite boat are separated in the vacuum sintering process described in the described step (F).
Guaranteeing on the satisfactory basis of carbon, oxygen level of raw material powder, controlling hydrogen flowing quantity well, making that graphite or scarce carbon phase appear in the unlikely alloy that causes of the variation of carbon content in the briquetting.Because cobalt contents is higher in the alloy formula,, utilize the aluminium sesquioxide particle that alloy and graphite boat are separated for preventing bottom carburizing of sintering process interalloy even sticking boat; Can reduce the volatilization of cobalt phase by the vacuum tightness of control in the sintering process, avoid that alloy is inner the carbon phase to occur lacking.
The present invention is by adding the rare earth element of trace in raw material, and the PDC bit matrix material that adopts the preparation of conventional vacuum sintering technology with shock resistance, wear resistance and fracture toughness property be improved largely than all with the ordinary rigid alloy phase, can compare favourably with low pressure isostatic sintering product properties; And compare with low pressure isostatic sintering method, because the present invention adopts the conventional vacuum sintering method, can reduce the cost of PDC bit matrix material greatly.
The present invention will be further described below by specific embodiment, but and do not mean that limiting the scope of the invention.
Embodiment
Embodiment 1
In 200 kilograms of hard gold ball grinders, add 100 kilograms of WC powder, 14 kilograms of Y that contain 0.4 weight % of cobalt powder and cobalt powder
2O
3, sintered carbide ball is 3: 1 with the compound ratio, adds 77 liters of industrial spirit, behind 24 hours batch mixings, ball milling, with 320 order phosphor-copper nets with slurry filtration, through 12～24 hours precipitations, the sucking-off supernatant liquor is being lower than under 100 ℃ the temperature the compound oven dry, and is sieving with 60～80 eye mesh screens; It is 8% rubber gasoline solution that rubber is mixed with concentration; The gained rubber gasoline solution is mixed powder mix, and the add-on that makes rubber is 0.8 weight % of powder mix, behind drying, screening, the system material, adopts compression molding method compacting standard bending strength, toughness test bar product and PDC drill bit body material; With the pressed compact processing of in 30 kilograms of hydrogen furnaces, coming unstuck, under 400～450 ℃ and 600～650 ℃, be incubated 1～2 hour respectively, then sample is carried out vacuum sintering, heat up at a slow speed when adopting low temperature (about 2～2.5 ℃/minute), the principle of (about 3～3.5 ℃/minute) is rapidly heated during high temperature, under 400～450 ℃, 600～650 ℃, 800～850 ℃ and 1050～1200 ℃, be incubated 0.5 hour respectively, finish to sintering for 1200 ℃ and keep low vacuum state (vacuum tightness＞250Pa).Adopt 80～120 purpose aluminium sesquioxide particles that alloy and graphite boat are separated during sintering.
Embodiment 2
In 200 kilograms of hard gold ball grinders, add 100 kilograms of WC powder, 15 kilograms of Y that contain 0.8 weight % of cobalt powder and cobalt powder
2O
3, sintered carbide ball is 3: 1 with the compound ratio, adds 77 liters of industrial spirit, behind 24 hours batch mixings, ball milling, with 320 order phosphor-copper nets with slurry filtration, through 12～24 hours precipitations, the sucking-off supernatant liquor is being lower than under 100 ℃ the temperature the compound oven dry, and is sieving with 60～80 eye mesh screens; It is 13% rubber gasoline solution that rubber is mixed with concentration; The gained rubber gasoline solution is mixed powder mix, and the add-on that makes rubber is 1.1 weight % of powder mix, behind drying, screening, the system material, adopts compression molding method compacting standard bending strength, toughness specimen and PDC drill bit body material; With the pressed compact processing of in 30 kilograms of hydrogen furnaces, coming unstuck, under 400～450 ℃ and 600～650 ℃, be incubated 1～2 hour respectively, then sample is carried out vacuum sintering, heat up at a slow speed when adopting low temperature (about 2～2.5 ℃/minute), the principle of (about 3～3.5 ℃/minute) is rapidly heated during high temperature, under 400～450 ℃, 600～650 ℃, 800～850 ℃ and 1050～1200 ℃, be incubated 0.5 hour respectively, finish to sintering for 1200 ℃ and keep low vacuum state (vacuum tightness＞250Pa).Adopt 80～120 purpose aluminium sesquioxide particles that alloy and graphite boat are separated during sintering.
Embodiment 3
In 200 kilograms of hard gold ball grinders, add 100 kilograms of WC powder, 14.5 kilograms of Y that contain 0.6 weight % of cobalt powder and cobalt powder
2O
3, sintered carbide ball is 3: 1 with the compound ratio, adds 77 liters of industrial spirit, behind 24 hours batch mixings, ball milling, with 320 order phosphor-copper nets with slurry filtration, through 12～24 hours precipitations, the sucking-off supernatant liquor is being lower than under 100 ℃ the temperature the compound oven dry, and is sieving with 60～80 eye mesh screens; It is 10% rubber gasoline solution that rubber is mixed with concentration; The gained rubber gasoline solution is mixed powder mix, and the add-on that makes rubber is 0.9 weight % of powder mix, behind drying, screening, the system material, adopts compression molding method compacting standard bending strength, toughness specimen and PDC drill bit body material; With the pressed compact processing of in 30 kilograms of hydrogen furnaces, coming unstuck, under 400～450 ℃ and 600～650 ℃, be incubated 1～2 hour respectively, then sample is carried out vacuum sintering, heat up at a slow speed when adopting low temperature (about 2～2.5 ℃/minute), the principle of (about 3～3.5 ℃/minute) is rapidly heated during high temperature, under 400～450 ℃, 600～650 ℃, 800～850 ℃ and 1050～1200 ℃, be incubated 0.5 hour respectively, finish to sintering for 1200 ℃ and keep low vacuum state (vacuum tightness＞250Pa).Adopt 80～120 purpose aluminium sesquioxide particles that alloy and graphite boat are separated during sintering.
The ordinary method test shows, the common PDC bit matrix material that the bending strength of the body material of the PDC drill bit of the inventive method preparation is more congruent improves more than 20%, and impelling strength, wear resistance and fracture toughness property also are significantly improved.
Claims (7)
1, a kind of PDC bit matrix preparation methods that contains rare earth, its step is as follows:
(A) with WC powder, cobalt powder and rare earth addition mix, wherein cobalt powder accounts for 13～16 weight %, and rare earth addition accounts for 0.4～0.8 weight % of cobalt powder, and all the other are the WC powder:
(B) with above-mentioned batching through wet-milling, the precipitation, drying, the screening, mixed powder;
(C) rubber being mixed with concentration is 8～13% rubber gasoline solution;
(D) the gained rubber gasoline solution is mixed powder mix, the add-on that makes rubber is 0.8～1.1 weight % of powder mix, and behind drying, screening, the system material, compression moulding gets pressed compact;
(E) the gained pressed compact is come unstuck under hydrogen shield;
(F) the above-mentioned pressed compact that has come unstuck is carried out vacuum sintering.
2, the PDC bit matrix preparation methods that contains rare earth according to claim 1, it is characterized in that: rare earth addition is a yttrium oxide described in the described step (A).
3, the PDC bit matrix preparation methods that contains rare earth according to claim 1 and 2 is characterized in that: 60～80 eye mesh screens are used in screening described in the described step (B).
4, the PDC bit matrix preparation methods that contains rare earth according to claim 3 is characterized in that: during vacuum sintering described in the described step (F), heat up at a slow speed during low temperature, be rapidly heated during high temperature.
5, the PDC bit matrix preparation methods that contains rare earth according to claim 4, it is characterized in that: it is 2～2.5 ℃/minute that described low temperature heats up at a slow speed; It is 3～3.5 ℃/minute that described high temperature is rapidly heated.
6, the PDC bit matrix preparation methods that contains rare earth according to claim 4, it is characterized in that: during vacuum sintering described in the described step (F), under 400～450 ℃, 600～650 ℃, 800～850 ℃ and 1050～1200 ℃, be incubated 0.5 hour respectively; Finish maintenance vacuum tightness＞250Pa to sintering for 1200 ℃.
7, according to claim 5 or the 6 described PDC bit matrix preparation methods that contain rare earth, it is characterized in that: utilize the aluminium sesquioxide particle that alloy and graphite boat are separated in the vacuum sintering process described in the described step (F).
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| CN 200310116074 CN1635174A (en) | 2003-12-30 | 2003-12-30 | Preparing method for bit basis material containing rare earth |
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| CN 200310116074 CN1635174A (en) | 2003-12-30 | 2003-12-30 | Preparing method for bit basis material containing rare earth |
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| CN1635174A true CN1635174A (en) | 2005-07-06 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100462463C (en) * | 2006-03-30 | 2009-02-18 | 中南大学 | Material for eliminating impurity inside metallurgical furnace |
| CN101016826B (en) * | 2007-03-08 | 2010-06-16 | 江汉石油钻头股份有限公司 | Bit body of diamond bit and manufacture method therefor |
| CN101704101B (en) * | 2009-11-27 | 2012-03-28 | 西南石油大学 | Formula and technique for manufacturing geophysical prospecting bit by powder sintering |
| CN104439248A (en) * | 2014-12-05 | 2015-03-25 | 江西耀升钨业股份有限公司 | Preparation method of diamond enhanced tungsten carbide composite spherical crown button with gradient structure |
| CN105618736A (en) * | 2016-02-21 | 2016-06-01 | 刘辉 | Reamer bit |
| CN108380818A (en) * | 2018-04-12 | 2018-08-10 | 北京科技大学 | The method that isostatic cool pressing combination lost foam prepares Metal Substrate SHS wear-resistant coatings |
| CN109518058A (en) * | 2018-12-06 | 2019-03-26 | 宇龙精机科技（浙江）有限公司 | A kind of deep-hole drill bit hard alloy and preparation method thereof |
-
2003
- 2003-12-30 CN CN 200310116074 patent/CN1635174A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100462463C (en) * | 2006-03-30 | 2009-02-18 | 中南大学 | Material for eliminating impurity inside metallurgical furnace |
| CN101016826B (en) * | 2007-03-08 | 2010-06-16 | 江汉石油钻头股份有限公司 | Bit body of diamond bit and manufacture method therefor |
| CN101704101B (en) * | 2009-11-27 | 2012-03-28 | 西南石油大学 | Formula and technique for manufacturing geophysical prospecting bit by powder sintering |
| CN104439248A (en) * | 2014-12-05 | 2015-03-25 | 江西耀升钨业股份有限公司 | Preparation method of diamond enhanced tungsten carbide composite spherical crown button with gradient structure |
| CN105618736A (en) * | 2016-02-21 | 2016-06-01 | 刘辉 | Reamer bit |
| CN108380818A (en) * | 2018-04-12 | 2018-08-10 | 北京科技大学 | The method that isostatic cool pressing combination lost foam prepares Metal Substrate SHS wear-resistant coatings |
| CN109518058A (en) * | 2018-12-06 | 2019-03-26 | 宇龙精机科技（浙江）有限公司 | A kind of deep-hole drill bit hard alloy and preparation method thereof |
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