For 14 nm and 28 nm process, equipment is often similar or the same, just that 14 nm requires MORE equipment due to additional processing steps.Here are bidding infors for Chinese fabs,if you can find any bidding from new SMIC fabs rather than old fabs,please tell me.
2022 May
2022 April
2022 March
2022 February
2022 January
Do you have any source to prove that there is plenty of second hand 28nm equipments but no second hand 14nm equipments on the market?
Texas Instruments never have any 28nm fab as far as I know it,so the simple answer is TI cannot build 28nm fab because they don't have the expertise. Ti outsource many of their products to fabs in Taiwan, did you know that?
See paper to compare equipment required for 28 nm vs 7 nm processes. Note for etch, 3x more equipment used for 7 nm process.
No paywall version:
Can you prove that there is a distinct category of 14 nm only and 28 nm only equipment?
And your bidding info is a long documents. Can you point out the specific sections you refer to?