Diamond-containing composite material, preparation method and use

Abstract

The invention belongs to the field of new materials and discloses a preparation method of a diamond-containing composite material, comprising the following steps: step 1: mixing Ni-Fe-Sn-Cu pre-alloyed powder, a polymer binder and diamond; step 2: solidifying the mixture of step 1, and then crushing the solidified product into particles that can pass through a 30-mesh screen; step 3: heating in an oxygen or air atmosphere to carbonize and oxidize the polymer binder in the particles obtained in step 2; and then heating in a reducing gas atmosphere to reduce the oxidized metal to obtain diamond particles; the surface of the diamond particles is covered with a porous surface layer of Ni-Fe-Sn-Cu pre-alloyed powder; step 4: mixing Cr-Fe pre-alloyed powder, Ni-Fe-Sn-Cu pre-alloyed powder, Cr-Ni-Fe pre-alloyed powder, metal binder and diamond particles; and step 5: cold pressing, sintering and hot pressing the mixture obtained in step 4 to obtain the composite material. The composite material first uses Ni-Fe-Sn-Cu pre-alloyed powder to coat diamond, and then uses a previously patented technology for subsequent mixing. The resulting composite material has improved aging and lifespan. The invention also provides a preparation method and use of the composite material.

Description

Technical Field

[0001] The present invention relates to the field of new materials, in particular to a diamond-containing composite material, a preparation method and application thereof. Background Art

[0002] The applicant previously filed an invention patent application, CN117047109A, for a diamond-impregnated drill bit and its preparation method. This method utilizes 30-45 parts of a skeleton material, 10-20 parts of an intermediate component, 45-60 parts of a bonding material, and 15-19 parts of diamond to produce a composite material. The skeleton material comprises Cr-Fe pre-alloyed powder, Ni-Fe-Sn-Cu pre-alloyed powder, and Cr-Ni-Fe pre-alloyed powder. The composite material exhibits an average aging rate of 6-7 m / h and an average lifespan of 45-57 m.

[0003] After further research, the applicant found that the above performance can be further optimized.

[0004] The technical problem to be solved by this solution is: how to improve the effectiveness and life of diamond drill bits. Summary of the Invention

[0005] The object of the present invention is to provide a composite material containing diamond, wherein the composite material is first coated with Ni-Fe-Sn-Cu pre-alloyed powder, and then subjected to subsequent mixing treatment using a prior patented technology, thereby improving the aging and life of the composite material.

[0006] The invention also provides a preparation method and application of the composite material.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A method for preparing a composite material containing diamond comprises the following steps:

[0009] Step 1: Mix Ni-Fe-Sn-Cu pre-alloyed powder, polymer binder and diamond;

[0010] Step 2: solidifying the mixture of step 1, and then crushing the solidified product into particles that can pass through a 30-mesh sieve;

[0011] Step 3: Heating in an oxygen or air atmosphere to carbonize and oxidize the polymer binder in the particles obtained in step 2; then heating in a reducing gas atmosphere to reduce the oxidized metal to obtain diamond particles; the surface of the diamond particles is covered with a porous surface layer of Ni-Fe-Sn-Cu pre-alloyed powder;

[0012] Step 4: Mixing Cr-Fe pre-alloyed powder, Ni-Fe-Sn-Cu pre-alloyed powder, Cr-Ni-Fe pre-alloyed powder, metal binder, and diamond particles;

[0013] Step 5: The mixture obtained in step 4 is subjected to cold pressing, sintering and hot pressing to obtain the composite material.

[0014] The core innovation of the present invention is that the diamond is first coated with Ni-Fe-Sn-Cu pre-alloyed powder, and then the subsequent mixing process is carried out using the prior patented technology, thereby improving the aging and life of the composite material.

[0015] The specific principle is: Existing research shows that Ni-Sn-Cu pre-alloyed powder has good wear resistance; when a small amount of iron is added, its plasticity is significantly improved. Compared with Cr-Fe pre-alloyed powder and Cr-Ni-Fe pre-alloyed powder, the biggest advantage of Ni-Fe-Sn-Cu pre-alloyed powder is its good plasticity.

[0016] When diamonds are coated with Ni-Fe-Sn-Cu pre-alloyed powder, a protective layer is embedded in the diamond's surface, similar to the setting of a diamond ring. This protective layer is fully bonded to the subsequent alloy layer through hot pressing. When the diamond is rubbed and scratched, the protective layer forms a tight connection with the alloy layer, fully utilizing the plasticity and wear resistance of the Ni-Fe-Sn-Cu alloy, making it difficult for the diamond to be pulled out of the alloy layer. The shedding of the diamond occurs simultaneously with the wear of the alloy layer, effectively extending the life of the drill bit. Furthermore, the excellent wear resistance of the alloy formed by the Cr-Fe pre-alloyed powder, Ni-Fe-Sn-Cu pre-alloyed powder, and Cr-Ni-Fe pre-alloyed powder can effectively increase the overall drilling depth of the drill bit.

[0017] In the above-mentioned method for preparing a composite material containing diamond, the polymer binder is an epoxy resin binder;

[0018] The weight ratio of the Ni-Fe-Sn-Cu pre-alloyed powder, the polymer binder and the diamond is 1-2:0.05-0.2:1.

[0019] In the above-mentioned method for preparing the composite material containing diamond, the fineness of the diamond is 40-55 mesh.

[0020] In the above-mentioned method for preparing the diamond-containing composite material, the fineness of the Ni-Fe-Sn-Cu pre-alloyed powder, Cr-Fe pre-alloyed powder, Cr-Ni-Fe pre-alloyed powder and metal binder are all 200-300 meshes.

[0021] In the above-mentioned method for preparing a diamond-containing composite material, in step 3, the heating temperature in an oxygen or air atmosphere is 330-420° C.;

[0022] The heating temperature is 600-700°C under reducing gas atmosphere;

[0023] Heat at 330-420℃ for 1-3h; heat at 600-700℃ for 3-4h.

[0024] In the above-mentioned method for preparing the diamond-containing composite material, the molar ratio of Cr to Fe in the Cr-Fe pre-alloyed powder is 1:0.5; the molar ratio of Ni, Fe, Sn, and Cu in the Ni-Fe-Sn-Cu pre-alloyed powder is 15:0.2:7:1; and the molar ratio of Cr, Ni, and Fe in the Cr-Ni-Fe pre-alloyed powder is 6:10:3.

[0025] In the above-mentioned method for preparing the diamond-containing composite material, in step 4, the ratio of Cr-Fe pre-alloyed powder, Ni-Fe-Sn-Cu pre-alloyed powder, Cr-Ni-Fe pre-alloyed powder, metal binder, and diamond particles is: 5-6:15-20:15-20:40-50:25-35.

[0026] In the above-mentioned method for preparing the diamond-containing composite material, in step 4, Co powder and Ni powder are further added; the weight ratio of the Cr-Fe pre-alloyed powder, Co powder and Ni powder is 5-6:5-10:5-10.

[0027] At the same time, the present invention also discloses a composite material containing diamond, which is prepared by any of the above methods.

[0028] Finally, the present invention also discloses the use of the composite material as described above to prepare a drill bit.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The composite material of the present invention first uses Ni-Fe-Sn-Cu pre-alloyed powder to wrap diamond, and then uses the previous patented technology to perform subsequent mixing treatment, so that the aging and life of the obtained composite material are improved. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example 1

[0033] A method for preparing a composite material containing diamond comprises the following steps:

[0034] Step 1: Mix Ni-Fe-Sn-Cu pre-alloyed powder, polymer binder and diamond;

[0035] The weight ratio of Ni-Fe-Sn-Cu pre-alloyed powder, polymer binder, and diamond is 1:0.1:1;

[0036] The particle size of diamond is such that it can pass through a 50-mesh sieve; the chemical formula of Ni-Fe-Sn-Cu pre-alloyed powder is 15Ni-0.2Fe-7Sn-Cu;

[0037] The polymer binder is bisphenol A epoxy resin, which contains a curing agent. After mixing, it can form a brittle solid structure.

[0038] Step 2: solidifying the mixture of step 1, and then crushing the solidified product into particles that can pass through a 30-mesh sieve;

[0039] Step 3: heating in an air atmosphere to carbonize and oxidize the polymer binder in the particles obtained in step 2;

[0040] The heating temperature is 400°C and the heating time is 3h;

[0041] Then, heating is performed in a hydrogen reducing gas atmosphere to reduce the oxidized metal to obtain diamond particles; the surface of the diamond particles is covered with a porous surface layer of Ni-Fe-Sn-Cu pre-alloyed powder;

[0042] The heating temperature is 600-700°C and the heating time is 3 hours.

[0043] Step 4: Mix the Cr-Fe pre-alloyed powder, Ni-Fe-Sn-Cu pre-alloyed powder, Cr-Ni-Fe pre-alloyed powder, metal binder, and diamond particles in a mixer for 70 minutes at a mixer speed of 30 r / min;

[0044] The chemical formula of Ni-Fe-Sn-Cu prealloyed powder is the same as that in step 1; the chemical formula of Cr-Fe prealloyed powder is Cr-0.5Fe; the chemical formula of Cr-Ni-Fe prealloyed powder is 6Cr-10Ni-3Fe; the metal binder is 660-Cu;

[0045] The weight ratio of Cr-Fe pre-alloyed powder, Ni-Fe-Sn-Cu pre-alloyed powder, Cr-Ni-Fe pre-alloyed powder, metal binder and diamond particles is: 5.5:18:18:45:30;

[0046] Step 5: The mixture obtained in step 4 is subjected to cold pressing, sintering and hot pressing to obtain the composite material.

[0047] The sintering temperature of the sintering and hot pressing process is 940°C, the hot pressing pressure is 50KN, the holding time is 6 minutes, and the total time of the sintering and hot pressing process is 10 minutes.

[0048] Example 2

[0049] The method is substantially the same as Example 1, except that the weight ratio of Cr-Fe pre-alloyed powder, Ni-Fe-Sn-Cu pre-alloyed powder, Cr-Ni-Fe pre-alloyed powder, metal binder, and diamond particles is 5:20:15:50:25.

[0050] Example 3

[0051] The method is substantially the same as Example 1, except that the weight ratio of Cr-Fe pre-alloyed powder, Ni-Fe-Sn-Cu pre-alloyed powder, Cr-Ni-Fe pre-alloyed powder, metal binder, and diamond particles is 6:15:20:40:35.

[0052] Example 4

[0053] The process is substantially the same as Example 1, except that Co powder and Ni powder are further added in step 4, and the weight ratio of Cr-Fe pre-alloyed powder, Ni-Fe-Sn-Cu pre-alloyed powder, Cr-Ni-Fe pre-alloyed powder, metal binder, diamond particles, Co powder, and Ni powder is 5.5:18:18:45:30:5:5.

[0054] Example 5

[0055] The process is substantially the same as Example 1, except that Co powder and Ni powder are further added in step 4, and the weight ratio of Cr-Fe pre-alloyed powder, Ni-Fe-Sn-Cu pre-alloyed powder, Cr-Ni-Fe pre-alloyed powder, metal binder, diamond particles, Co powder, and Ni powder is 5.5:18:18:45:30:10:10.

[0056] Comparative Example 1

[0057] A method for preparing a composite material containing diamond comprises the following steps:

[0058] Step 1: Mix Cr-Fe pre-alloyed powder, Ni-Fe-Sn-Cu pre-alloyed powder, Cr-Ni-Fe pre-alloyed powder, metal binder, and diamond particles in a mixer for 70 minutes at a mixer speed of 30 r / min;

[0059] The diamond particles in this step are diamonds that have passed through a 50-mesh sieve without any covering layer on the surface;

[0060] The proportions and chemical formulas of the above five materials are the same as those in Example 1.

[0061] Step 2: The mixture obtained in step 1 is subjected to cold pressing, sintering and hot pressing to obtain the composite material.

[0062] The sintering temperature of the sintering and hot pressing process is 700°C, the hot pressing pressure is 50KN, the holding time is 6 minutes, and the total time of the sintering and hot pressing process is 10 minutes.

[0063] Comparative Example 2

[0064] A method for preparing a composite material containing diamond comprises the following steps:

[0065] Step 1: Cr-Fe pre-alloyed powder, Ni-Fe-Sn-Cu pre-alloyed powder, Cr-Ni-Fe pre-alloyed powder, metal binder, diamond particles, Co powder and Ni powder are mixed in a mixer for 70 minutes at a mixer speed of 30 r / min;

[0066] The diamond particles in this step are diamonds that have passed through a 50-mesh sieve without any covering layer on the surface;

[0067] The proportions and chemical formulas of the above 7 materials are the same as those in Example 1.

[0068] Step 2: The mixture obtained in step 1 is subjected to cold pressing, sintering and hot pressing to obtain the composite material.

[0069] The sintering temperature of the sintering and hot pressing process is 700°C, the hot pressing pressure is 50KN, the holding time is 6 minutes, and the total time of the sintering and hot pressing process is 10 minutes.

[0070] Performance Testing

[0071] Diamond drill bits prepared from the composite materials of the above examples and comparative examples were tested using a 100-meter core drilling double-drilling system at a rotation speed of 600-900 r / min. The drilled stratum was a C35 concrete foundation. The aging and average lifespan of the drill bits were tested.

[0072] The test results can be found in Table 1;

[0073] Table 1 Test results

[0074]

[0075]

[0076] Result analysis:

[0077] 1. As can be seen from Examples 1-3, the drill bit made of the composite material of the present invention has a long aging and service life;

[0078] 2. It can be seen from Examples 4 and 5 that, as described in the prior application of this case, adding a small amount of Co powder and Ni powder is helpful for the overall toughness of the alloy and can increase the service life of the drill bit.

[0079] 3. In Example 2 and Example 3, the increase or decrease of diamond particles can not achieve the best in terms of aging and service life. The possible reason is that the drilling efficiency is related to the amount of diamond. At the same time, the aging can be increased in theory when there are too many diamonds, but the actual aging is reduced. The possible reason is that the increase in the amount of diamond reaches the point where the holding force of the alloy for the diamond particles is reduced, resulting in the diamond particles falling off when the alloy is not completely worn, thereby reducing aging. The amount of diamond particles is too little. Although its holding force increases, the wear rate is accelerated and aging is also reduced.

[0080] 4. It can be seen from Comparative Examples 1 and 2 that the prior art of the applicant cannot achieve the effect of the present invention.

[0081] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein. The claims should not be construed as limiting the claims to which they relate.

Claims

1. A method for preparing a composite material containing diamond, characterized in that: The steps include: Step 1: Mix Ni-Fe-Sn-Cu pre-alloyed powder, polymer binder and diamond; Step 2: solidifying the mixture of step 1, and then crushing the solidified product into particles that can pass through a 30-mesh sieve; Step 3: Heating in an oxygen or air atmosphere to carbonize and oxidize the polymer binder in the particles obtained in step 2; then heating in a reducing gas atmosphere to reduce the oxidized metal to obtain diamond particles; the surface of the diamond particles is covered with a porous surface layer of Ni-Fe-Sn-Cu pre-alloyed powder; Step 4: Mixing Cr-Fe pre-alloyed powder, Ni-Fe-Sn-Cu pre-alloyed powder, Cr-Ni-Fe pre-alloyed powder, metal binder, and diamond particles; Step 5: The mixture obtained in step 4 is subjected to cold pressing, sintering and hot pressing to obtain the composite material; the molar ratio of Cr to Fe in the Cr-Fe pre-alloyed powder is 1:0.5; the molar ratio of Ni, Fe, Sn, and Cu in the Ni-Fe-Sn-Cu pre-alloyed powder is 15:0.2:7:1; and the molar ratio of Cr, Ni, and Fe in the Cr-Ni-Fe pre-alloyed powder is 6:10:3; In step 3, the heating temperature in the oxygen or air atmosphere is 330-420°C; The heating temperature is 600-700°C under reducing gas atmosphere; Heat at 330-420℃ for 1-3h; heat at 600-700℃ for 3-4h.

2. The method for preparing a composite material containing diamond according to claim 1, wherein: The polymer binder is an epoxy resin binder; The weight ratio of the Ni-Fe-Sn-Cu pre-alloyed powder, the polymer binder and the diamond is 1-2:0.05-0.2:

1.

3. The method for preparing a composite material containing diamond according to claim 1, characterized in that: The fineness of the diamond is 40 to 55 meshes.

4. The method for preparing a composite material containing diamond according to claim 1, wherein: The fineness of the Ni-Fe-Sn-Cu pre-alloyed powder, the Cr-Fe pre-alloyed powder, the Cr-Ni-Fe pre-alloyed powder and the metal binder are all 200-300 meshes.

5. The method for preparing a composite material containing diamond according to claim 1, characterized in that: In step 4, the ratio of Cr-Fe pre-alloyed powder, Ni-Fe-Sn-Cu pre-alloyed powder, Cr-Ni-Fe pre-alloyed powder, metal binder and diamond particles is 5-6:15-20:15-20:40-50:25-35.

6. The method for preparing a composite material containing diamond according to claim 5, characterized in that: In the step 4, Co powder and Ni powder are further added; the weight ratio of the Cr-Fe pre-alloyed powder, Co powder and Ni powder is 5-6:5-10:5-10.

7. A composite material containing diamond, characterized in that: The method is as described in any one of claims 1 to 6.

8. Use of the composite material according to claim 7 in preparing a drill bit.

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