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Determination of Rockwell hardness indentation adhesion coated cemented carbide

Easy and fast method. I. Introduction 8O years since the hard coating in metal cutting blade processing Taijin been widely used. Not only in the types of coating materials increased E; the titanium carbide, titanium nitride and alumina, etc., But also keep the structure of the new plane j to the development of composite coatings from a single layer. With the coating process and equipment development and application of the rapid expansion of the scope, people between the coating and substrate Taijin bond strength (bond strength) are increasingly concerned about, because it is hard to judge Taijin blade coating One of the important indicators of quality. Many researchers use different methods to test them, but not a satisfactory test methods. This paper is based on a homemade apparatus 15OA HR type Rockwell hardness, Rockwell hardness indentation method using the CVD method of carbide deposited on the TiC-Ti (C, N) ~ TiN and Ti (CN) coating the indentation test, and LSRH ~] mark on the determination of bond strength meter values, a systematic comparison , the indentation level of the surrounding coating peeling off to find the corresponding relationship between them so as to establish a simple and rapid with Rockwell hardness test method of coating adhesion strength two, test method 1. Sample: the sample used in this study produced by the CVD method TiC-Ti (C, N) ~ TiN class and Ti (C,[link widoczny dla zalogowanych], N) hard coating station class box blade. 2. Test Methods: HR - 150A type hardness tester, diamond indenter barrier to 6O kg load, the load time is 6 seconds, the indentation test on the sample. 1OO times the boxes in the relative pressure head under a microscope to observe the extent of the surrounding coating flaking. Third, test results and analysis 1. Under the optical microscope at 100 times the observed, so the indentation adhesion integrity not seen around coating spalling, as shown in Figure 2A j bond strength of small,[link widoczny dla zalogowanych], slightly in the indentation around the spalling and severe spalling, as shown in Figure 2B and 2D week. 2. The test instrument with LSRH notch specimens Jing mark test several times, obtaining the bond strength test are shown in Table 1.3. Rockwell hardness tester with a test like the above description of the indentation test, obtained the degree of indentation around the coating flaking relationship between bond strength and the peeling area percentage,[link widoczny dla zalogowanych], published in Table 2. 1 capsule adhesive force of the test sample bat No. Nang Di {Results pill., Si kg A4.0B2.8C2.6D2.4E2.257 Table 2 coating adhesion split down the relationship between the degree of bond coating spalling area of the sample, j ', spalling degree bream number, pounds' neigh 1l1A4 .0 l0 Table B2.82 minor peeling off peeling off peeling off D2.280 {C2.424l moderate severe spalling -4 + Based on the test data,[link widoczny dla zalogowanych], production of polonium-end power under different degrees of coating flaking curve, shown in Figure 1. 1 can be seen from the monopoly of wisdom,[link widoczny dla zalogowanych], polyester layer and the substrate bond strength and the indentation around the relationship between the degree of coating flaking l smaller bond strength, coating flaking serious; revolves more dogs knot strength, less coating peeling off, not even spalling. Loading conditions in Canada, and coatings of diamond indenter contacts the sample to produce a deformation, when the substrate and coating to produce stress. Specimen under the indenter area in compression, to reach the edge of the maximum stress, once the contact edge of the area and the stress exceeds the coating alloy, a ~ -. ~ ~ Base between the bullock knot strength, the coating is peeling. Indentation with diamond indenter in the coating surface depicts the notch, and gradually increase the load in the pressure head, until the coating film was scratched, see the base date, then Parker is the critical load of load to this as a shed for cattle between the coating and then coming across a thread holding force WO l assessment scale. Indentation with a diamond indenter is around the assessment of the degree of coating flaking of coating adhesion strength. Thus, indentation method to characterize the bond between coating and the substrate size of the force is entirely feasible bond coating figure 1 j 'and spalling of the relationship between the percentage of 5. According to the results, the preparation of a set of evaluation patterns. Coating adhesion to the four levels as shown in Figure 2. As a routine test coating and the substrate to ask, revolves Results ability scale. IV, Conclusion 1. By experiment, the Rockwell hardness indentation level of the surrounding coating flaking between the coating and the substrate and the cohesive force between the test so as to establish the method of coating adhesion strength. 2. This method is based on domestic instruments and equipment, operating 58 of Figure 2A ~ complete peeling off the table, a small bleed at the nose falling off a 4.0 kg B, = bleed at the nose 2.8, kg C ~ medium peel, three bleed at the nose 2.4, D a serious falling off pounds, four button 2.2, pounds is simple, fast, good adaptability. 3. Coating and substrate bond strength with the material, process and organizational structure, thickness and strength are closely related. Therefore, with the necessary test conditions, the need to further explore the coating bond strength and the relationship between these factors in order to continue to improve between the coating and the substrate adhesive strength test method Calligraphists . l '. -..,

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