In the use of diamond saw blades, diamond utilization is relatively low, this is because the head diamond is not wear failure, but a huge loss in shedding form.
Traditional manufacturing diamond segment is rely on casing grip on the diamond to fixed diamond, When the casing wear to the diamond is too much exposure, the diamond will be falling off on their own.
To improve the binding force of the casing and the diamond is the most effective technical measures to avoid diamond early loss. Unfortunately diamond and casing is difficult to connect, the more effective technical measures is plated titanium, nickel and other metals on the diamond surface, in order to achieve the effective combination of diamond and casing.
Traditional casing powder is made of a simple pure metal powder or alloy powder, these metals either non-wetting of the diamond, or not wettability at the sintering temperature of the diamond. On the research, in traditional copper alloy powder added chromium powder, titanium powder, vanadium powder, zirconium powder, nickel powder, manganese powder and other metal powder to form a pre-alloy powder, pre-alloy powder containing the active elements of wetting the diamond, during the diamond sintering process, the active element mutual diffusion with diamond, finish braze connection casing and the diamond.
The artificial diamond tip casing is usually constituted by two components of the skeleton component and a binder, generally selected high melting point, high abrasion resistance, high strength metal skeleton material, choose a group of low melting point metal to be used as binder. In the selection of a binder, due to the low strength of commonly used low-melting metal (Sn, Zn, etc.) is easily to be oxidized, and easy enrichment, its performance is not good, silver, copper and other metals can be overcome the above drawbacks, but higher melting point or price limit their use.
In the mechanical mixing of the powder sintering casing, exists at the tip of the diamond are connected together by mechanical package insert and gripping role with the carcass, the diamond and matrix connection is a mechanical connection. The sintering of metal binding agent casing already has a certain density and a relatively high strength, hardness, toughness, and also has a more secure mechanical mosaic effect on the parcel diamond.
Binding agent should have two basic functions: First, connected the wear-resistant material into the grid skeleton holding diamond; second, with diamond wear and abrasion, make the diamond normal protrusion. In addition, the binding agent not only have a certain degree of hardness, toughness and wear resistance, If have a certain degree of wettability on the diamond will greatly improve the diamond protrusion height, thereby improving the performance of the use of the diamond tool.
The good performance of the binding agent, that is in diamond, carcass materials, porosity, manufactured using various conditions to determine the circumstances, can be formed sufficiently stable casing; while using casing have a better maintain synchronous wear or skip ahead wear with diamond, make the diamond full play and reasonable wear, falling off.
Use diamond surface active elements plating is a viable technical solution. Active element is a strong carbide forming elements and transition elements, these elements can occur interfacial reaction to produce compounds, make the diamond surface covered with a layer of easy-to-bound metal carcass metal, this metal layer can be brazed together with fetal metal. The common active elements have titanium, chromium, tungsten and other elements; Although molybdenum, vanadium, zirconium, niobium, tantalum can also occur the carbonization, but the price is high without being applied; other elements cobalt, nickel, manganese, silicon, aluminum under certain conditions also can be formed carbides, carbides is respectively: Co2C, Ni3C, Mn3C, SiC, Al4C3. Currently, the most common application is titanium, nickel-plated.
Source:http://www.mhcmp.com
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