Uporaba tehnologije trga v diamantnih orodjih

Visoka trdota in odlične fizične in mehanske lastnosti diamantov naredijo diamantno orodja nepogrešljivo in učinkovito orodje za obdelavo različnih trdih materialov . oprijem matrične kovinske osnove do diamanta (sposobnost inkapsulacije matrice) je eden glavnih dejavnikov, ki vplivajo

 

 

Due to the high interfacial energy between diamond and general metals and alloys, diamond particles cannot be infiltrated by general low-melting alloys and have poor adhesion. In traditional manufacturing technology, diamond particles are only embedded in the matrix metal base by the mechanical clamping force generated by the matrix shrinkage, without forming a strong chemical bond or metallurgical bond, resulting in the easy separation of diamond particles from the matrix metal base during work, greatly reducing the life and performance level of diamond tools. The utilization rate of diamond in most impregnated tools is low, and a large amount of expensive diamonds fall off and are lost in waste chips during work. Lin Zengdong and others took the lead in using diamond surface metallization technology to give diamond surfaces many new properties, na primer odlična toplotna prevodnost in električna prevodnost, dobra toplotna stabilnost, izboljšanje njihovih izvirnih fizikalnih in kemičnih lastnosti ter izboljšanje njihove zmogljivosti za kovinske ali zlitine .

 

Diamond surface metallization has attracted great attention from the diamond tool manufacturing industry at home and abroad since the 1970s. Many people are committed to the research of realizing diamond surface metallization during the sintering process, adding strong carbide metal powder to the matrix material or pre-bonding it on the diamond surface (this kind of diamond does not chemically react with the coating before heating, and can only be a diamond coating) in the hope that they can achieve chemical bonding to the diamond during the sintering process. Although the literature has demonstrated that some metals such as tungsten (unoxidized) can form a WC layer on the diamond surface at a relatively low temperature (about 800℃), from the perspective of the process used to achieve diamond surface pre-metallization, it is necessary to heat at more than 600℃under vacuum conditions for 1 hour to obtain the ideal bonding Force . V skladu s sintranskimi pogoji trenutno uporabljenih impregniranih orodij za rezanje diamantov je malo verjetno, da bi na površini diamanta ustvaril metalizacijsko plast, če se v ne-vakuumu ali nizkih vakuumu segreva na več kot 900 stopinj {{12} {13 enriched on the diamond surface or the interface reaction reaches the metallurgical bonding between the binder and the diamond, it is an atomic diffusion process. According to the temperature used for hot pressing and such a short time, this process is not sufficient. Under the solid phase sintering conditions (sometimes there is a small amount of low-strength and low-melting-point metal or alloy liquid phase), the chemical Povezovanje ali metalurško vezanje matrice na diamant je zelo šibko ali se sploh ne bo oblikovalo .

 

Pre-metallization of the diamond surface is not the purpose, but only one of the measures to achieve chemical metallurgical bonding with the matrix metal. After the plated diamond is sintered into saw (drill) teeth, the diamond exposed on its fracture surface has lost the coating, and the surface of the residual pit where the diamond has fallen off is very smooth. This phenomenon Zdi se, da diamant in matrika še nista dosegla ravni kemične zavoja ., tudi če je dosežena površinska predhodna metalizacija diamanta, tradicionalna metoda metalurgije v trdnem faznem prahu ne more doseči močne vezi med diamantom in materialom matrice .

 

V poznih osemdesetih letih so ljudje začeli raziskovati tehnologijo drzne tehnologije za proizvodnjo diamantnih orodij . Diamondska površina je prevlečena z določenimi prehodnimi elementi (kot so Ti, Cr, W itd. Metalurška vez skozi trdožitev in s tem dosežena resnična diamantna površinska metalizacija . To je načelo diamantnega trganja . Iz objavljenih patentov in člankov je razvidno, da lahko ta tehnologija doseže največjo vrednost diamantnega roba 2/3. lahko dobimo, ko operacija ostrenja roba doseže stabilno vrednost roba . Zato se pričakuje, da bo uporaba tehnologije za trdo dosegla močno vez med matrično kovino (brazin) in matičnim materialom-diamond in jeklenim matrico .