PVD decorates the new challenge of coating

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To high-end product, maintain its for a long time the exterior is elegant crucial. This raised very tall requirement to the wearability of product surface coating. Imagine a mobile phone to be put in the pocket to be strung together with the key grind a lot of year, won't leave any scrape however. This is the challenge that high-end product coating must face. Market trend is mixed besides the hardware that defend bath outside door window fittings, the small-sized electron device that the individual uses (wait like camera of player of PDA, mobile telephone, MP3, number) the market that already made a new rapid progress. According to the analytic report of GARTNER, come 3 years recently the market of these products had risen one times. 2005, the mobile phone sales volume of the whole world is 200 million, every mobile phone includes two surfaces to decorate a component at least. Department of high-end product development is being searched colourful and the hard coating that high wear-resisting brushs. Use a requirement according to its, must consider a lot of issues, if nickel allergy is mixed,use the issue such as 6 price chromium. Base material can be plastic already (be like ABS/PC/PA) , also can be a metal (be like stainless steel, aluminium and magnesium alloy) . As a result of these material or cannot bear high temperature, or texture is too soft, or not electric, accordingly, how the coating of a kind of low cost, will tall hardness, tall wear-resisting, Gao Guangliang besmears Fu arrives on these base material, it is the new challenge of pair of PVD coating technologies. And the development that the technology of this kind of coating that develops for market of individual electron equipment at present also will benefit industry of car interior trim. Product of tall hardness high end decorates coating to must have tall hardness. But generally speaking, this just decorates the requirement on a kind of idea of coating to PVD, because of the PVD adornment coating that produces by Hauzer equipment to great majority character, tall hardness is its inhesion pledges. However, the PVD coat that has tall hardness just resolves the first situation of the problem, because need to consider the hardness of PVD coating not only, and the integral hardness that must consider manufactured goods. PVD coating is very thin, have 0 only commonly.

3 ～ 0.

5 micron. This is meant to any bigger load, the hardness of the product is decided by the hardness of PVD coating matrix. Stainless steel, aluminium and have copper - nickel - of chromic film plastic (like ABS) the base material that is a model, but the appropriate hardness that they do not have the high-end product place that makes by these material to ask normally, and what the exterior wearability that this kind of hardness is a product needs, because this needs,a thick and hard layer intermediate is formed between matrix and PVD coating. Because coating can become as the accretion of ply coarse, make coating surface loses brightness thereby, because this adds thick PVD coating,not be a good choice -- it can make the surface becomes coarse and ugly only! This raised an additional requirement: Thick and hard intermediate layer should have low-down surface roughness. Such ability make the PVD adornment coating above the layer maintains deposit inter fast shining face. Theoretic, to these intermediate layer can have multiple choice. The intermediate layer that a few Hauzer introduce to the company has developed a success or be being developed below. Nextpage applies at the CrN coating of stainless steel matrix to wait for high end in mobile phone, PDA in the production of small-sized electron equipment, stainless steel is a kind of base material that often uses. Although a lot of people think stainless steel is base material of a kind of horniness, but fall in a lot of circumstances, it still cannot provide enough wear-resisting damage, fight scratch ability. For example, the typical hardness of SS304 is 250HV0 about.

025 (the diamond pyramid hardness that when load is 25 grams, measures) . Here the circumstance falls, through adding a CrN intermediate layer, can increase the hardness of system of coating of matrix ＋ PVD. The hardness of CrN coating is as high as 3000HV0.

0050, be hardness of stainless steel matrix a certain number of times. The ply of intermediate layer depends on give load to issue finished products place to need hardness, and this hardness depends on again the wearability that product place needs. Intermediate layer ply is having conclusive effect to finished products hardness. To very thin CrN coating, the load that bring to bear on will deliver matrix directly through coating, the hardness that measures accordingly is equal to the hardness of stainless steel matrix actually. As the addition of CrN coating ply, the load that bring to bear on passes coating completely to deliver no longer, measures hardness also begins to increase. When achieving the ply with affirmatory some, the load that bring to bear on will be absorbed by CrN coating completely. After this although coating ply increases again, measures hardness also won't increase. Technology of electric arc deposit and splash shoot deposit technology to all can accumulate CrN coating with Yu Chen. Need when place when coating is thicker, splash shoot deposit technology to have can hold the dominant position with smooth coating, can ensure finished products has Gao Guangjie to spend the surface thereby. Apply at stainless steel matrix exceed hard coating is as similar as afore-mentioned example, utilize the rigidity that exceeds hard coating to be able to increase finished products as intermediate layer. For test and verify this, the test had on matrix of a few stainless steel. The hardness of stainless steel is 200HV0.

025. In Fu of the besmear on matrix multilayer coating, to make matrix and the outerest exceed felt is good between hard coating, used layer of a few intermediate felt, this is the plan that adopts generally when Fu of the besmear on metallic matrix exceeds hard coating. Carry the coat of deposit and enough ply, was increased below different load by the hardness of besmear product 2.

5 ～ 9 times. Use the challenge that exceeds hard coating to depend on how making exceed strong base coating and PVD color adornment good caking property is had between coating. Earlier development makes we have confidence to acquire good felt property as a result. The PVD coat that applies at plastic matrix is plastic before matrix is besmearing Fu PVD decorates coating, want electric copper facing first normally - nickel - chromic layer. The total ply of electric film can achieve 30 micron, its are inside bigger load limits coating has relatively changeless hardness as a result. Measures hardness does not change along with the load that bring to bear on, this shows electric film absorbed total active force (although load is very big) . Although measure gotten hardness absolute value to be 400HV about, the typical diamond pyramid hardness that compares any plastic matrix (Hv<10) get greatly much, but relative to character hardness is worth still on the low side. For this, can use the similar method that above paragraphs alludes, a layer intermediate adds between electric film and PVD adornment coating, in order to increase the integral hardness of the product. However here is put in a very big limitation, it is temperature. The melting point of plastic matrix decided to be able to be used at the highest temperature of coating craft, normally this means the coating time of intermediate layer to will increase greatly. A kind of brand-new method is to cancel electric film completely, the layer between direct on plastic matrix Tu Fuzhong. The temperature that craft must be in the deposit of intermediate layer to be restricted strictly has reasonable deposit rate below the condition. In addition, because plastic matrix is not electric, because this is deposit,craft cannot use dc bias voltage. Hauzer company is satisfying the coating craft of afore-mentioned requirements in research and development at present. CNC Milling CNC Machining