Material of a kind of new-style cutting tool -- pottery and porcelain -- material of metallic cladding cutting tool

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Summary: Through be on metallic matrix cladding 3 yuan of boride base the pottery and porcelain that preparation of pottery and porcelain gives, material of metallic cladding cutting tool has hardness of material of pottery and porcelain at the same time tall, wearability is good with metallic stuff strength tall, tenacity the performance dominant position with good, good thermal conductivity, it is data of a kind of new-style cutting tool that provides development potential extremely. Material of 1 foreword pottery and porcelain has admirable wearability, hear resistance, fight oxidation function to wait, but put in brittleness at the same time big, intensity function of low, heat conduction not the function blemish such as beautiful, restricted its to be in thereby the wide application of machining domain. To develop the performance dominant position of material of pottery and porcelain adequately, remedy its function flaw, the performance that achieves material of pottery and porcelain and metallic stuff is complementary, a kind of brand-new cutting tool material -- pottery and porcelain, emerge as the times require of material of metallic cladding cutting tool. Material of this kind of new-style cutting tool is to pass in the cladding on metallic matrix new-style Mo2FeB2 fastens 3 yuan of boride base preparation of pottery and porcelain and into, it had hardness of material of pottery and porcelain at the same time tall, wearability is good with metallic stuff strength tall, tenacity thermal conductivity is good, good wait for an advantage, the remains that layer of the pottery and porcelain in adding preparation process forms presses stress, make its have excel the integral performance advantage of material of onefold pottery and porcelain or metallic stuff; In the meantime, new-style pottery and porcelain, material of metallic cladding cutting tool still has good economy, it is a kind of cutting tool data that provides development potential extremely. Had not seen the story that concerns material of this cutting tool domestic and internationally at present, accordingly, the academic port with undertake to material of this kind of new-style cutting tool thorough research and development are had principal and economic value. The density of V30V50C50C70H50H70 of model of physical performance data that expresses material of a few kinds of 1 typical KHM (Mg/m3)8.

28.

38.

38.

38.

18.

1 hardness (HRA)898586838380 bending strength (GPa)2.

052.

252.

152.

251.

701.

Model of 75 Yang family names is measured (GPa)350300330290340305 ruptures tenacity (MN · M3/2) 19.

230.

018.

229.

518.

223.

0 hot coefficient of expansion (10-6/K) 8.

510.

511.

110.

211.

013.

The limits of content of BMoCrNiFe of composition limits element of 9 watches 2 KHM (723 ～ of %)3 ～ 251 ～ of 541 ～ fund of 3 yuan of 2 boride belongs to 8 surplus fund of 3 yuan of boride belongs to the characteristic of pottery and porcelain the mechanical function Mo2FeB2 of pottery and porcelain is 3 yuan of boride base pottery and porcelain (call KHM) again. KHM material has hardness tall, wearability is good wait for an advantage, its wearability and WC-Co alloy cardinal principle comparative, but the to other material injury when be being machined is righter than common hard alloy the loss of other material is smaller, and as low as the rate of nonferrous metal response such as copper, zinc, because this is special,apply to production nonferrous metal to machine a tool. The hardness limits that the KHMMo2FeB2 that Japanese ToyoKohan company develops fastens fund of 3 yuan of boride to belong to pottery and porcelain is 80 ～ 92HRA, bending strength limits is 1.

0 ～ 2.

60GPa, all comparative with the hardness of hard alloy and bending strength limits; The 3/5(that the density of KHM is density of common hard alloy about comparatives with the density of steel almost) . Express the 1 physical function that is material of a few kinds of typical KHM. KHM material is mixed by V, C, H M4 series composition, its corrosion resistance and the order that defy oxidisability to press V, C, H as the accretion of Cr and Ni content rise. Because the bending strength of material is the function of hardness (bending strength follows hardness reduce and raise) , and in every series, the hardness of material changes as the increase and decrease of boracic content, because the bending strength of this material also is the function of boracic content (bending strength follows boracic content reduce and raise) . Express the 2 elemental content range that are KHM material (still can add the elemental) such as a few tungsten, titanium in certain alloy. Graph 1 trail wears and tear more fund of 3 yuan of boride belongs to experiment sketch map the wearability of pottery and porcelain to examine the wearability of KHM material, use end to jump over (Ogoshi) wears away experiment method undertakes sliding wearing away experimenting to KHM material, use method of sand eject experiment to undertake to KHM material abrasive wears away experiment. Trail wears and tear more the experiment pursues 1 wear away more for end the sketch map of the experiment. Experiment condition and process are as follows: A will fixed shape sample with constant on the annular sample that load pressing is rotating; Choice coasting distance is 600m, load 185N, sliding velocity 0.

21 ～ 4.

39m/s. Through determining the bulk wear extent of a generation on shape sample, the unit that computation leaves in unit load and unit coasting distance wears away rate. Test result makes clear: To steel test specimen, the wearability of KHM alloy and hard alloy comparative, but smaller than hard alloy to the injury of other material; The wearability of Mo2FeB2 pottery and porcelain is equivalent to (even excel) pulverous metallurgy high-speed steel and hard alloy. Have the aid of is mixed to pottery and porcelain at SEM and XRD of hard alloy wear away the face undertakes study, result discovery: Slide in high speed when wearing away, wear away in Mo2FeB2 pottery and porcelain the oxide of low melting point such as a few MoO2, B2O3 was formed on the face, these oxide can rise to prevent the action of adhesive wear, and hard alloy wears away this kind of oxide was not formed on the face. Abrasive wears away the abrasive that the experiment uses sand eject law to undertake wears away test result makes clear, the stuff that KHM alloy has case hardening is handled than using the method such as spray, nitriding, cementite more wear-resisting, because the existence of photograph of horniness of 3 yuan of boride in KHM material makes its are fought,this is grind bead to wear away ability is able to rise. Graph compound sketch map expresses cladding of 2 pottery and porcelain and steel matrix the hot coefficient of expansion of a few kinds of 3 base material (10-6/K) base material 100 ℃ of 20 ～ 200 ℃ of 20 ～ 300 ℃ of 20 ～ 400 ℃ of 20 ～ 500 ℃ of 20 ～ 600 ℃ of 20 ～ 45 steel 11.

5912.

3213.

0913.

7114.

1814.

6715Mn steel 12.

3, 13.

2 -- 14.

9T10 steel 11.

513.

014.

314.

815.

116.

The 0 bending strength steel that express all sorts of 4 steel matrix and KHMV50 diffused junction to close are planted fund of 3 yuan of boride belongs to TRS(MPa)53091012203 of S45CSCM440SKD61 bending strength of pottery and porcelain and steel matrix compound the hot coefficient of expansion that belongs to pottery and porcelain as a result of Mo2FeB2 fund is (10-6/K of × of 8 ～ 13) , the hot coefficient of expansion with steel is adjacent, because of it and this steel compound when leftover stress is lesser. Additional, the Fe-B that forms in the interface in agglomeration process or Fe-Mo2FeB2 in all brilliant fluid photograph makes Mo2FeB2 fund belongs to pottery and porcelain to be able to be united in wedlock together well with steel. At present abroad already had KHM reports with all sorts of steel matrix compound. Of cladding of pottery and porcelain and steel matrix compound like the graph 2 are shown, pursue among them 2a is cladding of pottery and porcelain, steel is compound sketch map, graph 2b is cladding of pottery and porcelain, steel, cladding of pottery and porcelain is compound sketch map. Watch 3 listed a few kinds of steel the hot coefficient of expansion of base material, can see, the hot coefficient of expansion of base material all is more than a few kinds of steel the most commonly used at the hot coefficient of expansion with steel compound KHMV30 or KHMC50, because this can form remains to press stress in surface of cladding of pottery and porcelain, and the existence of remains pressing stress conduces to the hardness that improves data and rupture tenacity. KHM regards tall hard cladding as material, agglomeration body can is before be united in wedlock with steel matrix or press base substrate. All sorts of steel matrix and KHMV50 diffused junction close (firing temperature: 1500K; Heat preservation time: 1.

2Ks; Atmosphere: Vacuum) bending strength sees a table 4. Agglomeration felt can gain the shear strength of prep above 400MPa. 4 pottery and porcelain, pink of the Fe-Cr-B alloy that the raw material of preparation craft preparation of material of metallic cladding cutting tool is water pulverization, MoB, pure Ni, pure Mo and pure Cr pink (compound of Mo2FeB2 of beardless and alone preparation, this kind 3 yuan of boride are the) that arises in agglomeration process. Raw material mixture powder is ground via the ball, sparge is dry, make bead, press agglomeration of form, vacuum together with steel matrix (the air inside furnace removes with nitrogen first before agglomeration, next vacuumize) can get pottery and porcelain, material of metallic cladding cutting tool. Pottery and porcelain, the design of general preparation technological process of material of metallic cladding cutting tool is shown 3 times like the graph. Graph 3 pottery and porcelain, the preparation technological process of material of metallic cladding cutting tool CNC Milling